Pen Y Fan and Corn Du from Storey Arms walk

A classic, and very popular, short walk climbing up to the two highest peaks in the Brecon Beacons along an engineered path.

Hiking Weather

7 Day Forecast for Brecon Beacons NP

Sunset: 20:17. Dusk: 20:53. Moon: 31% (01:02 to dawn)

8 9 10 11 12 13 14 15 16 17 18 19 20
Sun, 25-Aug
Mon, 26-Aug 0% 3% 3% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Tue, 27-Aug 8% 4% 0% 0% 4% 4% 0% 0% 0% 0% 0% 0% 0%
Wed, 28-Aug 48% 43% 39% 28% 18% 13% 16% 24% 32% 40% 44% 36% 33%
Thu, 29-Aug 0% 2% 2% 3% 4% 3% 3% 3% 3% 3% 2% 0% 0%
Fri, 30-Aug 9% 5% 3% 4% 4% 5% 5% 5% 5% 6% 7% 9% 8%
Sat, 31-Aug 38% 34% 30% 27% 26% 28% 41% 52% 57% 57% 51% 37% 23%
Sun, 01-Sep 5% 0% 0% 0% 5% 7% 7% 8% 9% 11% 11% 10% 8%

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Met Office Forecast

Wales

Low cloud and fog patches tonight, with warm sunshine tomorrow.

This Evening and Tonight:

After a sunny evening for many, low cloud along western coasts will roll inland overnight, with fog patches possible. It will stay dry though, with light winds. Minimum Temperature 14C.

Monday:

The low cloud and fog will soon clear to warm sunshine inland. However, some low cloud and fog patches may linger along coasts. Maximum Temperature 25C.

Outlook for Tuesday to Thursday:

It will turn fresher but unsettled on Tuesday and Wednesday, with sunshine and showers and the risk of thunder. Thursday will be drier though, with sunny spells.

Day 6-7 and Week 2:

It will become more unsettled on Friday, especially in the north. Occasionally heavy rain or showers will be likely here, with the risk of strong winds and it will feel rather cool for the time of year. The south may remain dry, especially in the southeast where temperatures will be above the seasonal average. Over the weekend, and into the start of September, it will probably be fairly unsettled nationwide. The heavier rain will be most likely in the northwest, with southeastern parts receiving the longest dry and sunny spells. However, there will be a risk of thundery showers breaking out across the southeast at times. Temperatures will vary around normal, with a possibility of further warm spells.

Week 3 and 4:

There are signals that changes in the weather patterns across the UK will become slow during this spell. At present it is considered that the predominate weather type will be unsettled conditions, leading to an increase in the chance for above average rainfall through September. However, more settled conditions are likely at times, especially around the middle of September, with temperatures likely to be near to or slightly above normal for the time of year.

Met Office : Wales : 2019-08-25T15:06:50

Daylight : Brecon Beacons NP

Date Dawn Sunrise Sunset Dusk Day Length
Sun, 25-Aug 05:37 06:14 20:17 20:53 15:16
Mon, 26-Aug 05:39 06:15 20:15 20:51 15:12
Tue, 27-Aug 05:41 06:17 20:13 20:48 15:07
Wed, 28-Aug 05:43 06:19 20:10 20:46 15:03
Thu, 29-Aug 05:45 06:20 20:08 20:44 14:59
Fri, 30-Aug 05:46 06:22 20:06 20:41 14:55
Sat, 31-Aug 05:48 06:23 20:04 20:39 14:51
Sun, 01-Sep 05:50 06:25 20:01 20:37 14:47
Mon, 02-Sep 05:52 06:27 19:59 20:34 14:42
Tue, 03-Sep 05:53 06:28 19:57 20:32 14:39
Wed, 04-Sep 05:55 06:30 19:55 20:30 14:35
Thu, 05-Sep 05:57 06:32 19:52 20:27 14:30
Fri, 06-Sep 05:58 06:33 19:50 20:25 14:27
Sat, 07-Sep 06:00 06:35 19:48 20:22 14:22
Sun, 08-Sep 06:02 06:36 19:46 20:20 14:18
Mon, 09-Sep 06:04 06:38 19:43 20:18 14:14
Tue, 10-Sep 06:05 06:40 19:41 20:15 14:10
Wed, 11-Sep 06:07 06:41 19:39 20:13 14:06
Thu, 12-Sep 06:09 06:43 19:36 20:10 14:01
Fri, 13-Sep 06:10 06:45 19:34 20:08 13:58
Sat, 14-Sep 06:12 06:46 19:32 20:06 13:54
Sun, 15-Sep 06:14 06:48 19:29 20:03 13:49
Mon, 16-Sep 06:15 06:49 19:27 20:01 13:46
Tue, 17-Sep 06:17 06:51 19:25 19:58 13:41
Wed, 18-Sep 06:19 06:53 19:22 19:56 13:37
Thu, 19-Sep 06:20 06:54 19:20 19:54 13:34
Fri, 20-Sep 06:22 06:56 19:18 19:51 13:29
Sat, 21-Sep 06:24 06:58 19:15 19:49 13:25
Sun, 22-Sep 06:25 06:59 19:13 19:47 13:22
Mon, 23-Sep 06:27 07:01 19:11 19:44 13:17
Tue, 24-Sep 06:29 07:02 19:08 19:42 13:13
Wed, 25-Sep 06:30 07:04 19:06 19:39 13:09
Thu, 26-Sep 06:32 07:06 19:04 19:37 13:05
Fri, 27-Sep 06:34 07:07 19:01 19:35 13:01
Sat, 28-Sep 06:35 07:09 18:59 19:32 12:57
Sun, 29-Sep 06:37 07:11 18:57 19:30 12:53
Mon, 30-Sep 06:39 07:12 18:54 19:28 12:49
Tue, 01-Oct 06:40 07:14 18:52 19:26 12:46
Wed, 02-Oct 06:42 07:16 18:50 19:23 12:41
Thu, 03-Oct 06:44 07:17 18:48 19:21 12:37
Fri, 04-Oct 06:45 07:19 18:45 19:19 12:34
Sat, 05-Oct 06:47 07:21 18:43 19:16 12:29
Sun, 06-Oct 06:49 07:22 18:41 19:14 12:25
Mon, 07-Oct 06:50 07:24 18:38 19:12 12:22
Tue, 08-Oct 06:52 07:26 18:36 19:10 12:18
Wed, 09-Oct 06:54 07:27 18:34 19:08 12:14
Thu, 10-Oct 06:55 07:29 18:32 19:05 12:10
Fri, 11-Oct 06:57 07:31 18:29 19:03 12:06
Sat, 12-Oct 06:59 07:32 18:27 19:01 12:02
Sun, 13-Oct 07:00 07:34 18:25 18:59 11:59
Mon, 14-Oct 07:02 07:36 18:23 18:57 11:55
Tue, 15-Oct 07:04 07:38 18:21 18:55 11:51
Wed, 16-Oct 07:05 07:39 18:19 18:53 11:48
Thu, 17-Oct 07:07 07:41 18:16 18:50 11:43
Fri, 18-Oct 07:09 07:43 18:14 18:48 11:39
Sat, 19-Oct 07:10 07:45 18:12 18:46 11:36
Sun, 20-Oct 07:12 07:46 18:10 18:44 11:32
Mon, 21-Oct 07:14 07:48 18:08 18:42 11:28
Tue, 22-Oct 07:15 07:50 18:06 18:40 11:25
Wed, 23-Oct 07:17 07:52 18:04 18:38 11:21
Thu, 24-Oct 07:19 07:53 18:02 18:36 11:17
Fri, 25-Oct 07:20 07:55 18:00 18:35 11:15
Sat, 26-Oct 07:22 07:57 17:58 18:33 11:11
Sun, 27-Oct 06:24 06:59 16:56 17:31 11:07
Mon, 28-Oct 06:25 07:00 16:54 17:29 11:04
Tue, 29-Oct 06:27 07:02 16:52 17:27 11:00
Wed, 30-Oct 06:29 07:04 16:50 17:25 10:56
Thu, 31-Oct 06:30 07:06 16:48 17:24 10:54
Fri, 01-Nov 06:32 07:08 16:46 17:22 10:50
Sat, 02-Nov 06:34 07:09 16:45 17:20 10:46
Sun, 03-Nov 06:36 07:11 16:43 17:18 10:42
Mon, 04-Nov 06:37 07:13 16:41 17:17 10:40
Tue, 05-Nov 06:39 07:15 16:39 17:15 10:36
Wed, 06-Nov 06:41 07:17 16:37 17:14 10:33
Thu, 07-Nov 06:42 07:18 16:36 17:12 10:30
Fri, 08-Nov 06:44 07:20 16:34 17:10 10:26
Sat, 09-Nov 06:45 07:22 16:33 17:09 10:24
Sun, 10-Nov 06:47 07:24 16:31 17:07 10:20
Mon, 11-Nov 06:49 07:25 16:29 17:06 10:17
Tue, 12-Nov 06:50 07:27 16:28 17:05 10:15
Wed, 13-Nov 06:52 07:29 16:26 17:03 10:11
Thu, 14-Nov 06:54 07:31 16:25 17:02 10:08
Fri, 15-Nov 06:55 07:33 16:23 17:01 10:06
Sat, 16-Nov 06:57 07:34 16:22 17:00 10:03
Sun, 17-Nov 06:58 07:36 16:21 16:58 10:00
Mon, 18-Nov 07:00 07:38 16:19 16:57 9:57
Tue, 19-Nov 07:02 07:39 16:18 16:56 9:54
Wed, 20-Nov 07:03 07:41 16:17 16:55 9:52
Thu, 21-Nov 07:05 07:43 16:16 16:54 9:49
Fri, 22-Nov 07:06 07:44 16:15 16:53 9:47
Sat, 23-Nov 07:08 07:46 16:14 16:52 9:44
Sun, 24-Nov 07:09 07:48 16:13 16:51 9:42
Mon, 25-Nov 07:11 07:49 16:12 16:50 9:39
Tue, 26-Nov 07:12 07:51 16:11 16:49 9:37
Wed, 27-Nov 07:13 07:52 16:10 16:49 9:36
Thu, 28-Nov 07:15 07:54 16:09 16:48 9:33
Fri, 29-Nov 07:16 07:55 16:08 16:47 9:31
Sat, 30-Nov 07:18 07:57 16:07 16:47 9:29
Sun, 01-Dec 07:19 07:58 16:07 16:46 9:27
Mon, 02-Dec 07:20 08:00 16:06 16:46 9:26
Tue, 03-Dec 07:21 08:01 16:05 16:45 9:24
Wed, 04-Dec 07:23 08:02 16:05 16:45 9:22
Thu, 05-Dec 07:24 08:04 16:04 16:44 9:20
Fri, 06-Dec 07:25 08:05 16:04 16:44 9:19
Sat, 07-Dec 07:26 08:06 16:04 16:44 9:18
Sun, 08-Dec 07:27 08:07 16:03 16:44 9:17
Mon, 09-Dec 07:28 08:09 16:03 16:43 9:15
Tue, 10-Dec 07:29 08:10 16:03 16:43 9:14
Wed, 11-Dec 07:30 08:11 16:03 16:43 9:13
Thu, 12-Dec 07:31 08:12 16:03 16:43 9:12
Fri, 13-Dec 07:32 08:13 16:03 16:43 9:11
Sat, 14-Dec 07:33 08:14 16:03 16:43 9:10
Sun, 15-Dec 07:34 08:14 16:03 16:43 9:09
Mon, 16-Dec 07:35 08:15 16:03 16:44 9:09
Tue, 17-Dec 07:35 08:16 16:03 16:44 9:09
Wed, 18-Dec 07:36 08:17 16:03 16:44 9:08
Thu, 19-Dec 07:37 08:18 16:04 16:45 9:08
Fri, 20-Dec 07:37 08:18 16:04 16:45 9:08
Sat, 21-Dec 07:38 08:19 16:05 16:45 9:07
Sun, 22-Dec 07:38 08:19 16:05 16:46 9:08

Data: US Navy Observatory

Moonlight : Brecon Beacons NP

Date Sunset Dusk Moon Rise Moon Set Dawn Sunrise % Full Max. Ht. Night Walk
Sun, 25-Aug 20:17 20:53 01:02 dawn 05:39 06:15 31% 09:25
Mon, 26-Aug 20:15 20:51 01:59 dawn 05:41 06:17 21% 10:25
Tue, 27-Aug 20:13 20:48 03:09 dawn 05:43 06:19 13% 11:26
Wed, 28-Aug 20:10 20:46 04:29 dawn 05:45 06:20 6%
Thu, 29-Aug 20:08 20:44 05:46 06:22 2%
Fri, 30-Aug 20:06 20:41 05:48 06:23 0%
Sat, 31-Aug 20:04 20:39 dusk 21:01 05:50 06:25 2% 14:21
Sun, 01-Sep 20:01 20:37 dusk 21:24 05:52 06:27 6% 15:15
Mon, 02-Sep 19:59 20:34 dusk 21:46 05:53 06:28 13% 16:07
Tue, 03-Sep 19:57 20:32 dusk 22:10 05:55 06:30 22% 16:59
Wed, 04-Sep 19:55 20:30 dusk 22:36 05:57 06:32 32% 17:51
Thu, 05-Sep 19:52 20:27 dusk 23:07 05:58 06:33 43% 18:43
Fri, 06-Sep 19:50 20:25 dusk 23:44 06:00 06:35 50% 19:35
Sat, 07-Sep 19:48 20:22 dusk 00:28 06:02 06:36 64% 20:27
Sun, 08-Sep 19:46 20:20 dusk 01:20 06:04 06:38 73% 21:19
Mon, 09-Sep 19:43 20:18 dusk 02:18 06:05 06:40 81% 22:09 after dusk
Tue, 10-Sep 19:41 20:15 dusk 03:21 06:07 06:41 88% 22:57 after dusk
Wed, 11-Sep 19:39 20:13 dusk 04:27 06:09 06:43 93% 23:43 after dusk
Thu, 12-Sep 19:36 20:10 dusk 05:33 06:10 06:45 97% 00:27 after dusk
Fri, 13-Sep 19:34 20:08 dusk dawn 06:12 06:46 99% 01:09 all night
Sat, 14-Sep 19:32 20:06 20:08 dawn 06:14 06:48 100% 01:51 before dawn
Sun, 15-Sep 19:29 20:03 20:25 dawn 06:15 06:49 98% 02:32 before dawn
Mon, 16-Sep 19:27 20:01 20:42 dawn 06:17 06:51 95% 03:14 before dawn
Tue, 17-Sep 19:25 19:58 21:00 dawn 06:19 06:53 90% 03:57 before dawn
Wed, 18-Sep 19:22 19:56 21:21 dawn 06:20 06:54 84% 04:41 before dawn
Thu, 19-Sep 19:20 19:54 21:45 dawn 06:22 06:56 76% 05:29 before dawn
Fri, 20-Sep 19:18 19:51 22:15 dawn 06:24 06:58 67% 06:20
Sat, 21-Sep 19:15 19:49 22:54 dawn 06:25 06:59 57% 07:14
Sun, 22-Sep 19:13 19:47 23:44 dawn 06:27 07:01 50% 08:11
Mon, 23-Sep 19:11 19:44 00:46 dawn 06:29 07:02 36% 09:09
Tue, 24-Sep 19:08 19:42 02:00 dawn 06:30 07:04 25% 10:08
Wed, 25-Sep 19:06 19:39 03:22 dawn 06:32 07:06 16% 11:06
Thu, 26-Sep 19:04 19:37 04:48 dawn 06:34 07:07 8%
Fri, 27-Sep 19:01 19:35 06:16 dawn 06:35 07:09 3% 12:03
Sat, 28-Sep 18:59 19:32 06:37 07:11 0%
Sun, 29-Sep 18:57 19:30 dusk 19:46 06:39 07:12 1% 13:52
Mon, 30-Sep 18:54 19:28 dusk 20:09 06:40 07:14 4% 14:46
Tue, 01-Oct 18:52 19:26 dusk 20:34 06:42 07:16 10% 15:39
Wed, 02-Oct 18:50 19:23 dusk 21:04 06:44 07:17 18% 16:33
Thu, 03-Oct 18:48 19:21 dusk 21:39 06:45 07:19 28% 17:27
Fri, 04-Oct 18:45 19:19 dusk 22:21 06:47 07:21 38% 18:20
Sat, 05-Oct 18:43 19:16 dusk 23:11 06:49 07:22 50% 19:13
Sun, 06-Oct 18:41 19:14 dusk 00:09 06:50 07:24 58% 20:05
Mon, 07-Oct 18:38 19:12 dusk 01:11 06:52 07:26 67% 20:54
Tue, 08-Oct 18:36 19:10 dusk 02:17 06:54 07:27 76% 21:40 after dusk
Wed, 09-Oct 18:34 19:08 dusk 03:23 06:55 07:29 83% 22:25 after dusk
Thu, 10-Oct 18:32 19:05 dusk 04:29 06:57 07:31 90% 23:08 after dusk
Fri, 11-Oct 18:29 19:03 dusk 05:36 06:59 07:32 95% 23:50 after dusk
Sat, 12-Oct 18:27 19:01 dusk 06:43 07:00 07:34 98% 00:31 after dusk
Sun, 13-Oct 18:25 18:59 dusk dawn 07:02 07:36 100% 01:13 all night
Mon, 14-Oct 18:23 18:57 19:06 dawn 07:04 07:38 100% 01:55 before dawn
Tue, 15-Oct 18:21 18:55 19:26 dawn 07:05 07:39 97% 02:40 before dawn
Wed, 16-Oct 18:19 18:53 19:48 dawn 07:07 07:41 94% 03:27 before dawn
Thu, 17-Oct 18:16 18:50 20:16 dawn 07:09 07:43 88% 04:16 before dawn
Fri, 18-Oct 18:14 18:48 20:52 dawn 07:10 07:45 81% 05:09 before dawn
Sat, 19-Oct 18:12 18:46 21:37 dawn 07:12 07:46 72% 06:04
Sun, 20-Oct 18:10 18:44 22:33 dawn 07:14 07:48 62% 07:01
Mon, 21-Oct 18:08 18:42 23:41 dawn 07:15 07:50 50% 07:58
Tue, 22-Oct 18:06 18:40 00:58 dawn 07:17 07:52 40% 08:54
Wed, 23-Oct 18:04 18:38 02:20 dawn 07:19 07:53 29% 09:49
Thu, 24-Oct 18:02 18:36 03:45 dawn 07:20 07:55 19% 10:43
Fri, 25-Oct 18:00 18:35 05:10 dawn 07:22 07:57 11% 11:36
Sat, 26-Oct 17:58 18:33 05:36 dawn 06:24 06:59 4% 11:29
Sun, 27-Oct 16:56 17:31 06:25 07:00 1%
Mon, 28-Oct 16:54 17:29 dusk 17:32 06:27 07:02 0% 12:23
Tue, 29-Oct 16:52 17:27 dusk 17:59 06:29 07:04 3% 13:17
Wed, 30-Oct 16:50 17:25 dusk 18:31 06:30 07:06 7% 14:12
Thu, 31-Oct 16:48 17:24 dusk 19:11 06:32 07:08 14% 15:08
Fri, 01-Nov 16:46 17:22 dusk 19:59 06:34 07:09 22% 16:03
Sat, 02-Nov 16:45 17:20 dusk 20:56 06:36 07:11 31% 16:56
Sun, 03-Nov 16:43 17:18 dusk 21:58 06:37 07:13 41% 17:47
Mon, 04-Nov 16:41 17:17 dusk 23:03 06:39 07:15 50% 18:36
Tue, 05-Nov 16:39 17:15 dusk 00:10 06:41 07:17 60% 19:21
Wed, 06-Nov 16:37 17:14 dusk 01:17 06:42 07:18 69% 20:05
Thu, 07-Nov 16:36 17:12 dusk 02:23 06:44 07:20 78% 20:47 after dusk
Fri, 08-Nov 16:34 17:10 dusk 03:30 06:45 07:22 85% 21:28 after dusk
Sat, 09-Nov 16:33 17:09 dusk 04:37 06:47 07:24 91% 22:10 after dusk
Sun, 10-Nov 16:31 17:07 dusk 05:46 06:49 07:25 96% 22:52 after dusk
Mon, 11-Nov 16:29 17:06 dusk dawn 06:50 07:27 99% 23:36 all night
Tue, 12-Nov 16:28 17:05 dusk dawn 06:52 07:29 100% 00:23 all night
Wed, 13-Nov 16:26 17:03 17:18 dawn 06:54 07:31 99% 01:12 before dawn
Thu, 14-Nov 16:25 17:02 17:51 dawn 06:55 07:33 96% 02:05 before dawn
Fri, 15-Nov 16:23 17:01 18:33 dawn 06:57 07:34 91% 03:00 before dawn
Sat, 16-Nov 16:22 17:00 19:26 dawn 06:58 07:36 84% 03:57 before dawn
Sun, 17-Nov 16:21 16:58 20:31 dawn 07:00 07:38 75% 04:53 before dawn
Mon, 18-Nov 16:19 16:57 21:45 dawn 07:02 07:39 65% 05:49
Tue, 19-Nov 16:18 16:56 23:04 dawn 07:03 07:41 50% 06:43
Wed, 20-Nov 16:17 16:55 00:25 dawn 07:05 07:43 43% 07:36
Thu, 21-Nov 16:16 16:54 01:47 dawn 07:06 07:44 32% 08:27
Fri, 22-Nov 16:15 16:53 03:10 dawn 07:08 07:46 22% 09:18
Sat, 23-Nov 16:14 16:52 04:33 dawn 07:09 07:48 13% 10:09
Sun, 24-Nov 16:13 16:51 05:56 dawn 07:11 07:49 6% 11:02
Mon, 25-Nov 16:12 16:50 07:12 07:51 2%
Tue, 26-Nov 16:11 16:49 07:13 07:52 0%
Wed, 27-Nov 16:10 16:49 dusk 17:01 07:15 07:54 1% 12:52
Thu, 28-Nov 16:09 16:48 dusk 17:46 07:16 07:55 4% 13:48
Fri, 29-Nov 16:08 16:47 dusk 18:39 07:18 07:57 10% 14:44
Sat, 30-Nov 16:07 16:47 dusk 19:40 07:19 07:58 16% 15:37
Sun, 01-Dec 16:07 16:46 dusk 20:46 07:20 08:00 25% 16:28
Mon, 02-Dec 16:06 16:46 dusk 21:54 07:21 08:01 33% 17:15
Tue, 03-Dec 16:05 16:45 dusk 23:01 07:23 08:02 43% 18:00
Wed, 04-Dec 16:05 16:45 dusk 00:08 07:24 08:04 50% 18:43
Thu, 05-Dec 16:04 16:44 dusk 01:14 07:25 08:05 61% 19:24
Fri, 06-Dec 16:04 16:44 dusk 02:21 07:26 08:06 70% 20:05
Sat, 07-Dec 16:04 16:44 dusk 03:29 07:27 08:07 79% 20:47 after dusk
Sun, 08-Dec 16:03 16:44 dusk 04:39 07:28 08:09 86% 21:30 after dusk
Mon, 09-Dec 16:03 16:43 dusk 05:51 07:29 08:10 92% 22:15 after dusk
Tue, 10-Dec 16:03 16:43 dusk 07:03 07:30 08:11 97% 23:04 after dusk
Wed, 11-Dec 16:03 16:43 dusk dawn 07:31 08:12 99% 23:56 all night
Thu, 12-Dec 16:03 16:43 dusk dawn 07:32 08:13 100% 00:52 all night
Fri, 13-Dec 16:03 16:43 17:18 dawn 07:33 08:14 98% 01:49 before dawn
Sat, 14-Dec 16:03 16:43 18:20 dawn 07:34 08:14 94% 02:48 before dawn
Sun, 15-Dec 16:03 16:43 19:33 dawn 07:35 08:15 87% 03:45 before dawn
Mon, 16-Dec 16:03 16:44 20:52 dawn 07:35 08:16 79% 04:40 before dawn
Tue, 17-Dec 16:03 16:44 22:13 dawn 07:36 08:17 69% 05:33
Wed, 18-Dec 16:03 16:44 23:34 dawn 07:37 08:18 58% 06:24
Thu, 19-Dec 16:04 16:45 00:55 dawn 07:37 08:18 50% 07:14
Fri, 20-Dec 16:04 16:45 02:15 dawn 07:38 08:19 36% 08:03
Sat, 21-Dec 16:05 16:45 03:36 dawn 07:38 08:19 25% 08:54
Sun, 22-Dec 16:05 16:46 04:56 dawn 07:39 08:20 16% 09:46

Notes

  • The moon's phase or fracillum (percentage of the moon illuminated) doesn't vary much with location.
  • A full moon is not just bigger, its much brighter. A half moon ('50%') give less than 5% of the illumination of a full moon. You can walk with a half moon if its high in the sky (after dusk for a growing moon, before dawn for a shrinking moon).
  • Sky glow (light reflected by air or clouds) from nearby cities, and especially snow on the ground also effect light levels.
  • Times will vary a few minutes, as (i) these figures are for the centre of the county the walk is in, and, (ii) if there are hills on the horizon.
  • Of course, you need a cloudless night as well!
  • Data: US Navy Observatory

Met Office Mountain Forecast

Issued: 1800 on 2019-08-25 for Brecon Beacons

Today

Low cloud, mist and fog slow to clear, with sunshine for the afternoon.

Summary There will be low cloud, mist and fog patches possible during the early hours, especially in the west. There will be some clearer skies in the east though. The low cloud and fog patches will linger once the sun comes up, gradually lifting through the morning. Sunshine will break through though, with blue skies by the late morning for the rest of the day.
Chance of Cloud free tops 40 % during the early hours in the east, as cloud bases may lower to the surface at times. Becoming 100 % through the morning as the cloud breaks in the sunshine.
Ground conditions
Visibility Poor in any mist, fog or low cloud. Becoming excellent, with clear detailing on nearby peaks.
Poor Visibility: High Likelihood
Strong Sunlight: Medium Likelihood
060708 091011 121314 151617 181920 212223
Weather Clear night Mist Sunny intervals Sunny intervals Sunny Sunny
Rain 00% 00% 00% 00% 00% 00%
Temp (tops) 16 14 13 15 18 18
Wind (tops) 6 6 4 4 6 8
Freezing Level 3400m 3200m 3200m 3400m 3500m 3500m
Day 1

Early mist and fog will return to western areas, with the east staying clearest. Sunny spells will develop, although showers will be possible from the mid morning, with the risk of thunder.

Ice Well above the peaks throughout.
Visibility Poor in any mist, fog or low cloud. Becoming excellent outside of any showers, with clear detailing on nearby peaks.
Wind Surface - Southwesterly 8 mph gusting 15 mph. 600 m - Southwesterly 15 mph gusting 22 mph.
Temp Positive 13 Celsius becoming positive 17 Celsius. (at high level)
Day 2

Sunshine and showers, with the risk of thunder.

Day 3

Early mist and fog, then sunny spells.

Day 4

Early mist and fog, then sunny spells and light showers.

Data: Met Office