Brighton weather by month
Brighton runs from about 5°C in January to 18°C in August, with February the wettest month at 151 mm.
warmest month
August
18°C
coolest month
January
5°C
wettest month
February
151 mm
worst air month
March
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 76 mm | 151 h | 6 |
| February | 9°C | 151 mm | 99 h | 5 |
| March | 9°C | 110 mm | 200 h | 12 |
| April | 10°C | 83 mm | 263 h | 8 |
| May | 13°C | 90 mm | 327 h | 9 |
| June | 15°C | 28 mm | 391 h | 7 |
| July | 17°C | 82 mm | 332 h | 5 |
| August | 18°C | 69 mm | 337 h | 6 |
| September | 15°C | 141 mm | 239 h | 5 |
| October | 13°C | 118 mm | 194 h | 6 |
| November | 9°C | 61 mm | 109 h | 5 |
| December | 8°C | 52 mm | 72 h | 7 |
About 2,714 hours of sun a year. Roughly 106 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.