London in September
good · 5th of the 12 months that clear the bar
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The numbers
| Daily high | 19°C |
|---|---|
| Nightly low | 12°C |
| Feels like, afternoon | 17°C |
| Rainy days | 8 · 61 mm |
| Humidity | 78% |
| Sunshine | 8.1 h/day |
| Daylight | 12.3 h/day |
| Crowds | 85 / 100, higher is quieter |
Ten-year averages for this calendar month. A rainy day is one with at least 2 mm.
What September is known for
- Shoulder season — Fall has pleasant weather and decreasing tourist numbers, providing better value.
Written by a language model from the climate figures; the numbers above are measured and win where the two disagree.
What to pack
- Warm layers for the evenings, which drop to about 12°C.
- A packable rain jacket for the 8 or so rainy days.
- Sun protection: about 8 hours of sunshine a day.
- Humidity averages 78%; breathable fabrics dry faster.
Each line is a threshold over the ten-year figures above, not advice from anywhere else.
Before you go
| Cost of living | expensive — prices run about 89% of the United States' (World Bank, 2025) |
|---|---|
| Currency | Pound sterling |
| Languages | English, Welsh, Scottish Gaelic, Scots |
| Plugs | Type G, 230 V |
| Driving | On the left |
| Emergency | 999, 112 |
| Calling code | +44 |
Facts from Wikidata (CC0), the UK Foreign Office (Open Government Licence) and the World Bank, refreshed 2026-09-23. The advisory is written for British travellers; entry rules depend on your passport.
The other months at London
- January avoid
- February ok
- March ok
- April good
- May sweet spot
- June sweet spot
- July sweet spot
- August sweet spot
- September
- October ok
- November ok
- December avoid
← August · All twelve months at London · October →
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