The Black Mountain (Y Mynydd Du) from Glyntawe walk

Rain pushing in for most parts.

Today:

Whilst northern parts will start bright, cloud in the south will spill to all parts through the morning. Rain will push in from the west, though some northern areas may avoid most of this. Maximum Temperature 12C.

Tonight:

Most of the rain should clear leaving things largely dry for a time with some clear breaks towards the north. Further persistent rain will push in from the south later. Minimum Temperature 7C.

Sunday:

After a very wet start, especially across southern parts, the heavy rain should clear away through the morning. By lunchtime it should be much brighter but some showers are likely. Maximum Temperature 14C.

Outlook for Monday to Wednesday:

There should be a lot of fine weather early next week. Clear skies at night may lead to some rural frosts, however largely sunny days mean daytime temperatures should rise.

Day 6 to 15

Through the remainder of September the weather should stay largely settled with long spells of sunshine and generally light winds. Northern and northwestern areas may be more changeable at times, with stronger winds and some outbreaks of rain, which may occasionally extend a little further east and south. Overnight, pockets of mist and fog are possible, especially in the south although it should remain mostly dry here. By day it will be warm for many, but some nights will be chilly with patchy frost possible. Into early October, many areas are likely to remain mostly settled, but it is likely to turn generally colder. Southern parts are likely to see the driest weather, but some wet and windy weather is possible in the north.

Day 16 to 30

Generally settled and drier conditions are likely to dominate across many parts of the UK during the beginning of this period, particularly across the south. This should bring a good deal of sunshine with any wet and windy weather, likely to be mostly confined to the north. Long nights will lead to a greater chance of fog and patchy frost, but the days will often be mild. Towards the middle of the month, there is considerable uncertainty in the forecast, with the chance that it may turn more unsettled across all parts, although this is most likely to be across the north.

Met Office : WL : 2018-09-22T02:34:26

Issued: 0600 on 2018-09-22 for Brecon Beacons

Today	An overcast and cold day with hill fog and spells of rain. Summary Cloudy at first, but outbreaks of rain soon arriving. The rain will become more persistent this morning and often heavy, before easing a little this afternoon. This evening overcast conditions with patchy light rain and drizzle will follow. Chance of Cloud free tops Becoming 450% from mid-morning and 10% this afternoon with main bases extensive above 400m, and with patches below across southwestern aspects. Ground conditions Visibility Good at first becoming mainly moderate or poor from mid-morning. Gales: Low likelihood Severe Chill Effect: Low likelihood Poor Visibility: High likelihood 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Weather Cloudy Light rain Heavy Rain Light rain Light rain Fog Rain 40% 80% 90% 80% 70% 40% Temp (tops) 7 7 7 7 7 7 Wind (tops) 10 9 7 9 12 12 Freezing Level 1500m 1600m 1700m 2400m 3200m 3100m
Day 1	Overcast with low cloud and patchy light rain and drizzle at first, followed by periods of locally heavy rain around the middle of the morning. This clearing late morning, with a mix of sunshine and isolated showers following from the north. Becoming dry through the evening with largely clear skies and the temperature falling quickly. Ice Above summits Visibility Moderate or poor becoming good or very good from mid-morning, then decreasing occasionally poor in showers. Wind Northeast 15 mph becoming North-northwest mean 25-30 mph gusts 45 mph from late morning. Temp Plus 5-8C (at high level)
Day 2	Excellent walking conditions with the vast majority of places staying dry while enjoying plenty of sunshine, with light winds and excellent visibility. However, it will feel cold with the wind chill at height.
Day 3	Dry with patchy cloud above the summits, sunny spells excellent visibility and light winds. Cold start though, with temperatures close to freezing in the valley and below freezing at height.
Day 4	Very similar to Tuesday, although some valley fog may develop around daybreak.

Data: Met Office