Durham weather by month
Durham runs from about 6°C in January to 26°C in July, with September the wettest month at 247 mm.
warmest month
July
26°C
coolest month
January
6°C
wettest month
September
247 mm
worst air month
February
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 6°C | 130 mm | 202 h | 10 |
| February | 8°C | 41 mm | 238 h | 13 |
| March | 12°C | 141 mm | 257 h | 9 |
| April | 17°C | 42 mm | 294 h | 8 |
| May | 21°C | 138 mm | 316 h | 8 |
| June | 25°C | 33 mm | 387 h | 10 |
| July | 26°C | 221 mm | 306 h | 13 |
| August | 24°C | 157 mm | 329 h | 11 |
| September | 22°C | 247 mm | 260 h | 9 |
| October | 16°C | 5 mm | 312 h | 6 |
| November | 13°C | 63 mm | 240 h | 7 |
| December | 6°C | 72 mm | 229 h | 9 |
About 3,370 hours of sun a year. Roughly 129 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.