Cambridge weather by month
Cambridge runs from about 5°C in January to 19°C in August, with September the wettest month at 130 mm.
warmest month
August
19°C
coolest month
January
5°C
wettest month
September
130 mm
worst air month
March
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 58 mm | 151 h | 7 |
| February | 8°C | 106 mm | 119 h | 8 |
| March | 8°C | 54 mm | 183 h | 12 |
| April | 10°C | 82 mm | 259 h | 8 |
| May | 14°C | 86 mm | 304 h | 8 |
| June | 15°C | 33 mm | 379 h | 6 |
| July | 17°C | 76 mm | 323 h | 5 |
| August | 19°C | 36 mm | 319 h | 6 |
| September | 15°C | 130 mm | 231 h | 5 |
| October | 12°C | 85 mm | 193 h | 7 |
| November | 8°C | 49 mm | 110 h | 6 |
| December | 7°C | 56 mm | 73 h | 7 |
About 2,644 hours of sun a year. Roughly 87 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.