7 Day Forecast for London
Sunset: 18:38.
Dusk: 19:12.
Moon: 99% (dusk to 06:10)
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Met Office Forecast
South East England
Cloud, rain and freshening winds arriving from the west today.
Today:
Early fog and low cloud clearing to give some brighter spells. Cloud, rain and freshening winds will arrive from the west during the afternoon. The rain will be locally heavy at times, especially on the hills. Feeling cool. Maximum Temperature 18C.
Tonight:
Cloud and rain will slowly clear away eastwards overnight, with clearer spells and a few showers following on behind. Light winds. Minimum Temperature 8C.
Thursday:
A cool and bright start on Thursday, with sunny spells and light winds. However, there are likely to be a few scattered light showers during the afternoon. Feeling cooler. Maximum Temperature 16C.
Outlook for Friday to Sunday:
Turning wet and very windy on Friday, with coastal gales. Further heavy and persistent rain on Saturday, windy too, perhaps some improvement later. Cool, windy and showery on Sunday.
Day 6-7 and Week 2:
An unsettled picture is likely for this period, with all parts of the country seeing showery spells as well periods of more prolonged rainfall at times. However, southern and western areas are expected to see the worst of these conditions with the most frequent and heaviest rainfall. Drier and calmer conditions could be seen at times, but likely only for short interludes. It will often be windy during this period, with a risk of gales at times, particularly along western and southwestern coasts. Overall, it is likely to feel rather cold as temperatures look set to be around average or below. During any of the brief calmer interludes overnight frost is also possible in the North.
Week 3 and 4:
A potential change in the weather is signalled around the middle of October. Whilst further rain and strong winds are likely at times, spells of fine and dry weather could become more widespread and long-lived. At night, these calmer conditions would allow frost and fog to form more readily. At this time of year, there is potential for fog to linger well into the daytime. Overall, temperatures probably recovering close to the seasonal average for mid-October.
Met Office : South East England : 2020-09-30T02:33:57
Daylight : London
Day length is dusk to dawn. Times will vary a little if there is a hill on the horizon.
It should still be light enough to read at dawn and dusk, so there will be enough light for walking even earlier (later).
Moonlight : London
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, (ii) if there are hills on the horizon, and (iii) if you are on a hill
- Of course, you need a cloudless night as well!