Climate averages 1991–2020
Brighton weather
in September.
A mild, moderately wet month: the 3rd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Brighton: daytime highs average 17.8°C and nights cool to about 12.7°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 67 mm of rain on roughly 11 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 41 min on an average September day.
The nearest other city in this atlas is Hove (2 km away). In September its highs average 17.8°C, about as warm as Brighton, with 67 mm of rain.
Among the 143 cities listed in the United Kingdom, Brighton ranks joint 54th of 143 for the warmest September highs and joint 112th of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Brighton is 0.5°C warmer than that mean.
From September to October, average highs fall by 3.3°C to 14.5°C, and monthly rainfall rises from 67 mm to 108 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Brighton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.7°C3.9°C | 3.9°C | 90 | 14.1 | 8.58 h |
| February | 7.7°C3.6°C | 3.6°C | 64 | 11.2 | 10.010 h |
| March | 9.6°C4.6°C | 4.6°C | 50 | 9.9 | 11.812 h |
| April | 12.0°C6.2°C | 6.2°C | 48 | 9.3 | 13.814 h |
| May | 14.9°C9.1°C | 9.1°C | 46 | 8.5 | 15.515 h |
| June | 17.5°C11.9°C | 11.9°C | 47 | 8.5 | 16.416 h |
| July | 19.6°C14.1°C | 14.1°C | 48 | 8.8 | 16.016 h |
| August | 19.8°C14.4°C | 14.4°C | 62 | 9.3 | 14.615 h |
| September, selected | 17.8°C12.7°C | 12.7°C | 67 | 10.7 | 12.713 h |
| October | 14.5°C10.2°C | 10.2°C | 108 | 13.9 | 10.811 h |
| November | 10.8°C6.9°C | 6.9°C | 116 | 15.3 | 9.09 h |
| December | 8.3°C4.6°C | 4.6°C | 103 | 14.1 | 8.08 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Hove in SeptemberUnited Kingdom · 2 kmHigh 17.8°C · Low 12.7°C · 67 mm rain
- Worthing in SeptemberUnited Kingdom · 17 kmHigh 17.9°C · Low 12.8°C · 66 mm rain
- Eastbourne in SeptemberUnited Kingdom · 31 kmHigh 17.6°C · Low 13.8°C · 66 mm rain
- Crawley in SeptemberUnited Kingdom · 32 kmHigh 18.1°C · Low 11.2°C · 50 mm rain
- Hastings, United Kingdom in SeptemberUnited Kingdom · 51 kmHigh 18.1°C · Low 12.9°C · 66 mm rain
- Guildford in SeptemberUnited Kingdom · 55 kmHigh 18.5°C · Low 11.0°C · 49 mm rain
- Purley in SeptemberUnited Kingdom · 57 kmHigh 18.1°C · Low 10.9°C · 51 mm rain
- Sutton in SeptemberUnited Kingdom · 58 kmHigh 18.2°C · Low 10.9°C · 49 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Brighton) is explained once on the Brighton year overview and on the Sources, method and limits page.
Hove lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.