September in London averages highs of 20 °C (67 °F) and lows of 11 °C (53 °F), with about 8 rainy days and 12 h 33 min of daylight.
September weather in London at a glance
average high to low each dot ≈ 3 rainy days
Is September a good time to visit London?
Good time to go: comfortably warm and some rain. September is usually shoulder season in London: fewer crowds than peak months, with prices often a little lower.
Our rule: a month scores 2 points for comfortable average highs of 18–28 °C (1 point for 14–18 or 28–32 °C) and 2 points for 5 or fewer rainy days (1 point for 6–10). Average highs above 35 °C or below 8 °C make it a tough month whatever the rain. A rainy day here means 2 mm of rain or more. 4 points = great, 3 = good, 2 = mixed, 0–1 = tough.
Holidays and events in September 2026
No public holidays fall in September 2026 in United Kingdom, so opening hours should be normal.
Things to do in London in September
September's weather suits a mix of outdoor sights and museums, so the open-air ones come first.
- Westminster and Big Ben — then a walk along the South Bank outdoors
- Hyde Park and Kensington — plus the free museums in South Kensington outdoors
- British Museum — free, huge, go with a plan indoors
- Tower of London and Tower Bridge — Crown Jewels inside indoors
- National Gallery and Trafalgar Square — free indoors
- Borough Market — lunch under cover indoors
Where to stay: South Bank or Covent Garden for sights on foot; King's Cross for transport; Shoreditch for nightlife.
What to pack for London in September
- Light layers for the day and a jumper for evenings, which cool to 11 °C (53 °F).
- An umbrella or a light waterproof: about 8 days this month see real rain.
- Comfortable walking shoes.
What a day in London costs
| Budget traveller | Mid-range | |
|---|---|---|
| Typical total per person, per day | £55–150 | £180–385 |
Excluding flights. September is usually shoulder season in London: fewer crowds than peak months, with prices often a little lower.
September in nearby cities
| City | High / low | Rainy days | Verdict |
|---|---|---|---|
| Paris | 22° / 12° | 7 | Good time to go |
| Amsterdam | 19° / 12° | 10 | Good time to go |
| Dublin | 17° / 11° | 10 | Mixed weather |
Plan your London trip
- 3 Days in London Itinerary: First-Timer's Plan for 2026
- Is London Expensive? A Realistic Budget Guide for 2026
Want the whole trip planned? Join the Journey waitlist: tell it where, when and your budget, and it plans every day hour by hour.
FAQ
Is September a good time to visit London?
By the numbers, September is a good time to go: comfortably warm and some rain, with average highs of 20 °C (67 °F) and about 8 rainy days. September is usually shoulder season in London: fewer crowds than peak months, with prices often a little lower. The best months for weather are June, July, August, September.
How warm is London in September?
Average highs are 20 °C (67 °F) and lows 11 °C (53 °F) (2015–2024 averages).
Does it rain a lot in London in September?
Expect about 8 days with 2 mm of rain or more, about 64 mm in total. It is the 6th driest month of the year in London.
Sources: climate averages from Open-Meteo historical weather (ERA5 reanalysis, 2015–2024); sea temperatures from the Open-Meteo marine API (2023–2024); public holidays from Nager.Date. Daylight is calculated for the 15th of the month. Averages are a guide, not a forecast. Costs are typical ranges per person per day, excluding flights.