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Notting Hill Carnival
📅 Late August each year
Large crowds and road closures affect parts of west London, so check transport routes before heading into the area.
Check official source →🇬🇧 United Kingdom · London
London Weather in September
Early autumnWeather in London during September is typically mild in the daytime and cool after sunset, based on 2016–2025 averages of 20°C (68°F) / 12°C (53°F). The 10-year average shows around 11 rainy days and about 64 mm of monthly precipitation, so some wet days are normal.
Avg high67.8°F 19.9°CAvg low53.2°F 11.8°CRainy days~11.1 daysMonthly rain64.0 mm
🧳 Packing guide
What to wear in London in September
For what to wear in London in September, long sleeves or a T-shirt with a light jacket make a practical combination. A compact umbrella is worth carrying for passing showers or wetter days.
Travel takeaway: For many travelers, these temperatures are comfortable for city sightseeing when you pack one flexible layer.
🗓️ Travel timing at a glance
London: 12-month travel weather
London can see rain in any month, usually spread across many changeable days rather than one concentrated wet season. Layers and light rain protection are useful year-round.
JanWinter · RainFebWinter · RainMarEarly springAprSpring · ShowersMaySpringJunEarly summerJulSummerAugSummerSepEarly autumnOctAutumn · RainNovLate autumn · RainDecWinter · Rain
Monthly labels summarize typical climate patterns for trip planning. Always check the latest forecast and tropical-storm alerts before departure.
🎉 Trip planning check
London 2026 events & busy periods
Check major events, holidays and periods that may affect crowds, transport or opening hours.
⚠️ Busy / closure period
Christmas and New Year period
📅 Late December–early January
Public transport schedules and opening hours for shops and attractions can differ from normal on public holidays.
Check official source →Event dates, holiday schedules and opening hours can change. Recheck the linked official tourism or government source before departure.
London in September · recent 3 years
Compare the most recent complete year with the two years before it. Daily high / low temperatures are shown in °F.
CalendarNo measurable rain🌧️ Rain⛈️ Thunderstorm❄️ SnowHigh / Low · °F
⭐ September 2025 · latest complete year☔ 11 days · 61.3 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
19.3°C/14.5°C
🌧️ 3.3 mm
2
19°C/12.8°C
🌧️ 1.8 mm
3
20°C/15.6°C
🌧️ 25.7 mm
4
18.8°C/14.1°C
🌧️ 4.7 mm
5
20.7°C/11.4°C
No rain
6
22°C/13.3°C
No rain
7
24.5°C/15.7°C
No rain
8
19.6°C/13.6°C
No rain
9
19.8°C/11°C
No rain
10
18°C/14.3°C
🌧️ 7.7 mm
11
18°C/12.1°C
🌧️ 3.7 mm
12
17.6°C/10.9°C
🌧️ 4.4 mm
13
17.2°C/11.8°C
🌧️ 3 mm
14
17.8°C/9.2°C
🌧️ 3.5 mm
15
17.8°C/14.1°C
No rain
16
18.3°C/12°C
No rain
17
18.8°C/12.5°C
🌧️ 1.1 mm
18
21.5°C/16.1°C
No rain
19
25.4°C/15°C
No rain
20
21.1°C/13.8°C
No rain
21
15.5°C/9.5°C
No rain
22
15.7°C/7.5°C
No rain
23
16.4°C/7.2°C
No rain
24
17.5°C/9.6°C
No rain
25
18.3°C/9.5°C
No rain
26
16.1°C/9.4°C
🌧️ 1.1 mm
27
17.4°C/10.6°C
No rain
28
16.8°C/11.8°C
No rain
29
17.7°C/8°C
No rain
30
18.3°C/8.9°C
No rain
September 2024☔ 19 days · 169.3 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
26.8°C/16°C
No rain
2
23°C/17.5°C
🌧️ 1.4 mm
3
21.8°C/14.7°C
🌧️ 2.9 mm
4
19°C/13.5°C
No rain
5
21.3°C/13.7°C
🌧️ 9.3 mm
6
23°C/15.4°C
🌧️ 9.4 mm
7
21°C/12.7°C
🌧️ 6.2 mm
8
19.5°C/13.7°C
🌧️ 8.8 mm
9
17.6°C/12.6°C
No rain
10
18.4°C/10.6°C
🌧️ 2.2 mm
11
15.5°C/8°C
🌧️ 3.9 mm
12
14.3°C/6.4°C
🌧️ 2.6 mm
13
15.8°C/5.6°C
No rain
14
18.7°C/4.7°C
No rain
15
19.2°C/8°C
🌧️ 1.5 mm
16
19.8°C/11.3°C
No rain
17
20.5°C/9.7°C
No rain
18
23°C/12.9°C
No rain
19
24°C/14.7°C
No rain
20
22.3°C/13.5°C
🌧️ 4.3 mm
21
23°C/14.9°C
No rain
22
20.5°C/15.1°C
🌧️ 18.8 mm
23
18°C/14.7°C
🌧️ 48.7 mm
24
16.4°C/11.8°C
🌧️ 5.5 mm
25
17°C/10.6°C
🌧️ 10 mm
26
16.2°C/11.9°C
🌧️ 13.1 mm
27
12.8°C/7.5°C
🌧️ 2.9 mm
28
13.6°C/4.4°C
No rain
29
14.6°C/6.1°C
🌧️ 5.1 mm
30
16.1°C/11.8°C
🌧️ 11.7 mm
September 2023☔ 10 days · 57.7 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
22°C/13.7°C
🌧️ 1.4 mm
2
23.2°C/14.8°C
No rain
3
24.7°C/12.9°C
No rain
4
27.4°C/15.1°C
No rain
5
27.7°C/15.8°C
No rain
6
29.8°C/14.8°C
No rain
7
29.9°C/17.3°C
No rain
8
29.5°C/17.9°C
No rain
9
31.4°C/17.5°C
No rain
10
30.7°C/18.2°C
🌧️ 1.6 mm
11
24.9°C/17°C
No rain
12
23°C/16.2°C
🌧️ 2.9 mm
13
19.8°C/12.2°C
No rain
14
22.3°C/12.1°C
No rain
15
24.9°C/10.8°C
No rain
16
25.9°C/12.5°C
No rain
17
21°C/14.9°C
🌧️ 4.8 mm
18
19°C/14°C
🌧️ 7.3 mm
19
19.3°C/13.3°C
No rain
20
20.5°C/15.2°C
🌧️ 27.3 mm
21
17.7°C/10.6°C
🌧️ 5.5 mm
22
17.5°C/8.7°C
🌧️ 1.5 mm
23
17.2°C/8.3°C
No rain
24
20.1°C/12.3°C
No rain
25
21.5°C/14.5°C
No rain
26
22.3°C/13.4°C
🌧️ 1.8 mm
27
21.6°C/13.2°C
No rain
28
19.4°C/13.5°C
No rain
29
19.1°C/13.2°C
🌧️ 2.4 mm
30
19°C/10.4°C
No rain
Historical calendars use Open-Meteo reanalysis data. A rainy day is counted when daily precipitation is at least 1 mm. Conditions at a specific hotel, beach or station can differ.
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Current London weather and 7-day forecast
When departure is close, the latest forecast matters more than long-term averages.
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Forecast data: MET Norway · CC BY 4.0 · cached by Travel Weather Fairy
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London weather in other months
Switch months to compare the seasonal pattern.