London in September
7.7out of 10
Yes, a good time to go
Mild: highs around 22°C. Frequent rain: about 10 rainy days.
22°CAvg high
12°CAvg low
10Rainy days (86 mm)
12:17 hDaylight
07:11Sunrise · 19:28 Sunset
Why this score
- Mild: highs around 22°C
- Frequent rain: about 10 rainy days
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.9 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -8°C | 72 mm | 12 | – | – | 3.5 |
| February | 0°C | -8°C | 58 mm | 10 | – | – | 3.8 |
| March | 6°C | -3°C | 70 mm | 11 | – | – | 4.7 |
| April | 13°C | 3°C | 93 mm | 12 | – | – | 5.9 |
| May | 19°C | 9°C | 98 mm | 12 | – | – | 7.0 |
| June | 24°C | 14°C | 102 mm | 12 | – | – | 7.4 |
| July | 26°C | 16°C | 99 mm | 12 | – | – | 7.4 |
| August | 25°C | 16°C | 85 mm | 11 | – | – | 7.6 |
| September | 22°C | 12°C | 86 mm | 10 | – | – | 7.7 |
| October | 15°C | 6°C | 86 mm | 12 | – | – | 6.3 |
| November | 8°C | 1°C | 77 mm | 11 | – | – | 5.2 |
| December | 2°C | -4°C | 69 mm | 11 | – | – | 3.9 |
Frequently asked questions
How hot is London in September?
Daytime highs average 22°C and nights about 12°C.
When is the best time to visit London?
The best months are September, August, June, July.