01Weather
London weather in September
Afternoons in September average 19.2 °C (67 °F) and nights cool to 11.5 °C (53 °F). The month brings about 44 mm (1.7 in) of rain spread over roughly 7 days. Compared with August it is 3.0 °C cooler; October is 4.3 °C cooler again.
What the averages hide
| In a typical September | Value | What it means |
|---|---|---|
| Warm afternoons (90th percentile) | 23 °C / 74 °F | one day in ten is at least this warm |
| Cool afternoons (10th percentile) | 15 °C / 59 °F | one day in ten stays below this |
| Cold nights (10th percentile) | 7 °C / 45 °F | one night in ten is colder than this |
| Days above 30 °C (86 °F) | 0.4 | per month, average 2016–2025 |
| Nights at or below 0 °C (32 °F) | 0.0 | frost mornings per month |
| Chance of rain on any given day | 23 % | at least 1 mm |
| Hottest / coldest September day 2016–2025 | 31.6 °C / 3.5 °C | extremes in the ten-year record |
02Daylight
Sunrise, sunset and the length of the day
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 1 September | 06:13 | 19:47 | 13.6 h |
| 15 September | 06:35 | 19:15 | 12.7 h |
| 30 September | 06:59 | 18:41 | 11.7 h |
Daylight shrinks by about 114 minutes over the month. Times are local (Europe/London).
03Crowds
How busy London is in September
busy The main sights are busy in September. What drives it:
- Open House weekend
- London Fashion Week
- schools back, families gone, adult travellers remain
04Public holidays
Public holidays in September 2027
No public holidays in United Kingdom fall in September, so shops and museums keep normal hours all month.
05Events
What's on in London in September
Every year in September
| Event | When | Type |
|---|---|---|
| Open House London | two weekends in September, buildings open free | architecture |
| London Fashion Week | mid-September | fashion |
07Packing
What to pack for London in September
- layers: t-shirt plus a light jacket for evenings
- comfortable walking shoes
- a compact umbrella for occasional showers
08Editor's notes
What the numbers don't tell you
September keeps summer warmth without the summer crowds, as schools return in the first week and families vanish from the queues. Open House weekend in mid-September unlocks hundreds of buildings that are otherwise closed, from government offices to private houses, free and mostly unticketed. London Fashion Week fills a few hotels for five days. Evenings draw in noticeably, from sunset near eight to half past six by month-end, but it is one of the driest months.
The Proms end with the Last Night in the second week, and the Thames Festival brings events to the riverside. Afternoon temperatures average 20 °C, with warm spells into the mid-twenties in the first half. Hotel prices fall from the August peak but remain above spring. The Palace State Rooms close at the end of the month. For gardens, Kew and the royal parks are still full, and the first autumn colour appears in the last week.
09Compare
London month by month
| Month | High | Low | Rain days | Sun h | Crowds | Verdict |
|---|---|---|---|---|---|---|
| January | 7 °C | 2 °C | 11 | – | quiet | Mixed |
| February | 9 °C | 4 °C | 11 | – | quiet | Mixed |
| March | 11 °C | 4 °C | 9 | – | moderate | Good |
| April | 14 °C | 5 °C | 7 | – | busy | Good |
| May | 17 °C | 8 °C | 9 | – | busy | Good |
| June | 21 °C | 12 °C | 8 | – | very busy | Good |
| July | 22 °C | 14 °C | 8 | – | very busy | Good |
| August | 22 °C | 14 °C | 8 | – | very busy | Good |
| September | 19 °C | 12 °C | 7 | – | busy | Excellent |
| October | 15 °C | 9 °C | 10 | – | moderate | Good |
| November | 10 °C | 6 °C | 12 | – | moderate | Good |
| December | 8 °C | 4 °C | 11 | – | busy | Mixed |
Not sure about September? See the best time to visit London.
10Elsewhere
September in nearby cities
| City | High | Rain days |
|---|---|---|
| Paris in September | 22 °C | 10 |
| Amsterdam in September | 20 °C | 10 |
| Dublin in September | 18 °C | 13 |
| Copenhagen in September | 18 °C | – |
| Prague in September | 21 °C | 8 |
| Venice in September | 24 °C | 7 |
11FAQ
London in September: your questions
Is September a good time to visit London?
September is one of the best months to visit London. Daytime highs average 19 °C (67 °F), rain falls on about 7 days, and hotel arrivals run above the yearly average, so the main sights are busy.
What is the weather like in London in September?
Expect mild days around 19 °C (67 °F) and nights near 12 °C (53 °F). One September in ten brings afternoons above 23 °C, and one in ten stays below 15 °C.
Does it rain a lot in London in September?
September brings about 44 mm (1.7 in) of rain over roughly 7 days, which is fairly dry by London standards. On any given day the chance of at least 1 mm of rain is 23 percent.
What should I wear in London in September?
Pack layers: t-shirt plus a light jacket for evenings, comfortable walking shoes, a compact umbrella for occasional showers.
Is London crowded in September?
The main sights are busy in September. Main drivers: Open House weekend; London Fashion Week; schools back, families gone, adult travellers remain.
What time does it get dark in London in September?
Around the middle of September the sun sets at about 19:15 and rises at 06:35, giving 12.7 hours of daylight.