Days 1-14 are a real forecast from weather models. Days 15-30 are season-typical values based on 1991-2020 climate averages — good for planning, NOT an exact forecast that far ahead.
30 days — London
14 real + 16 synthesised
Thu · Today Sunny
29°19°3%
Fri · Tomorrow Sunny
26°17°1%
Saturday 1/8 Sunny
27°15°1%
Sunday 2/8 Sunny intervals
27°18°2%
Monday 3/8 Sunny
26°17°3%
Tuesday 4/8 Sunny intervals
20°18°0.1 mm
Wednesday 5/8 Showers
21°17°2.8 mm
Thursday 6/8 Showers
19°14°11.3 mm
Friday 7/8 Cloudy
18°14°10.9 mm
Saturday 8/8 Cloudy
20°15°0.9 mm
Sunday 9/8 Cloudy
21°15°0.7 mm
Monday 10/8 Showers
17°15°5.0 mm
Tuesday 11/8 Sunny
24°13°7%
Wednesday 12/8 Sunny
26°16°4%
Thursday 13/8 Rain (climate average)
29°19°7.7 mm
Friday 14/8 Sunny intervals (climate average)
32°21°20%
Saturday 15/8 Sunny intervals (climate average)
32°21°20%
Sunday 16/8 Rain (climate average)
32°21°4.2 mm
Monday 17/8 Sunny intervals (climate average)
29°20°20%
Tuesday 18/8 Sunny intervals (climate average)
26°18°20%
Wednesday 19/8 Rain (climate average)
26°18°6.4 mm
Thursday 20/8 Sunny intervals (climate average)
30°20°20%
Friday 21/8 Sunny intervals (climate average)
33°21°20%
Saturday 22/8 Rain (climate average)
32°21°6.2 mm
Sunday 23/8 Sunny intervals (climate average)
32°21°20%
Monday 24/8 Sunny intervals (climate average)
27°18°20%
Tuesday 25/8 Rain (climate average)
28°19°8.8 mm
Wednesday 26/8 Sunny intervals (climate average)
28°19°20%
Thursday 27/8 Sunny intervals (climate average)
29°19°20%
Friday 28/8 Rain (climate average)
32°21°5.5 mm
How does the long-range forecast work?
Days 1-14: Fetched live from weather models (UKV, ECMWF, GFS) with statistical correction. Reliability ~85% for days 1-3, ~60% for days 7-10, ~45% for days 11-14.
Days 15-30: A real forecast does not exist that far ahead (a chaotic system). Instead we show season-typical values: the month’s average max/min from 1991-2020 climate data (London baseline with latitude correction for London), with mild weekly variation.
Use: "Roughly how warm is it usually in London in the last week of July?" — a good question for days 15-30. "Will it rain on 27 May?" — no serious forecast can say.
Forecasts from the UK Met Office UKV model, global weather models and official UK environmental data · Met Office UKV model · Environment Agency · Copernicus CAMS · NOAA