Richmond weather by month
Richmond runs from about 5°C in January to 26°C in July, with March the wettest month at 186 mm.
warmest month
July
26°C
coolest month
January
5°C
wettest month
March
186 mm
worst air month
February
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 103 mm | 200 h | 10 |
| February | 6°C | 70 mm | 237 h | 14 |
| March | 11°C | 186 mm | 271 h | 9 |
| April | 15°C | 37 mm | 291 h | 8 |
| May | 20°C | 98 mm | 323 h | 7 |
| June | 25°C | 46 mm | 392 h | 9 |
| July | 26°C | 90 mm | 331 h | 13 |
| August | 25°C | 66 mm | 339 h | 12 |
| September | 21°C | 81 mm | 256 h | 11 |
| October | 15°C | 12 mm | 302 h | 6 |
| November | 12°C | 53 mm | 243 h | 7 |
| December | 5°C | 52 mm | 220 h | 9 |
About 3,405 hours of sun a year. Roughly 90 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.