Birmingham weather by month
Birmingham runs from about 5°C in January to 27°C in August, with September the wettest month at 289 mm.
warmest month
August
27°C
coolest month
January
5°C
wettest month
September
289 mm
worst air month
September
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 149 mm | 199 h | 11 |
| February | 11°C | 126 mm | 221 h | 9 |
| March | 14°C | 155 mm | 259 h | 9 |
| April | 17°C | 150 mm | 301 h | 8 |
| May | 22°C | 107 mm | 342 h | 8 |
| June | 26°C | 54 mm | 363 h | 12 |
| July | 26°C | 148 mm | 323 h | 14 |
| August | 27°C | 48 mm | 386 h | 13 |
| September | 23°C | 289 mm | 282 h | 14 |
| October | 19°C | 6 mm | 336 h | 6 |
| November | 15°C | 91 mm | 248 h | 9 |
| December | 9°C | 72 mm | 222 h | 11 |
About 3,482 hours of sun a year. Roughly 141 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.