What to expect in London in September
September is one of the best times to visit London. Expect 20° / 12°, the biggest crowds of the year and prices close to the yearly average.
London weather in September
Typical conditions in London during September, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 20°C 68°F |
|---|---|
| Average low | 12°C 54°F |
| Rainfall | Moderate 50/100 |
| Total rainfall | 51 mm2.0 in |
| Rainy days | 9 |
| Daylight | 12 h 41 min |
| How it feels | Mild — layers weather |
Average highs sit around 20°C with lows near 12°C. Rainfall is moderate; the odd shower is likely.
Crowds & demand
Crowd levels are High for London — the biggest crowds of the year.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Layers you can shed: 20°C by day and about 12°C after dark is a two-jacket kind of month.
What it costs
Costs in September sit around the yearly average for London — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 20% less.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
Events & what’s on
No major festivals fall in September, so the destination feels like its everyday self.
London in September compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| July | 23° / 14° | High | $$$ | 48 |
| August | 23° / 14° | High | $$$ | 48 |
| September · This month | 20° / 12° | High | $$ | 53 |
| October | 15° / 8° | Moderate | $$ | 52 |
| November | 11° / 5° | Moderate | $$ | 50 |
These months score higher for London on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in September
If the destination is negotiable but the month is not, these places are at their best in September.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
