Lancaster weather by month
Lancaster runs from about 2°C in January to 26°C in July, with August the wettest month at 186 mm.
warmest month
July
26°C
coolest month
January
2°C
wettest month
August
186 mm
worst air month
February
21 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 2°C | 125 mm | 158 h | 10 |
| February | 3°C | 75 mm | 235 h | 21 |
| March | 8°C | 131 mm | 252 h | 10 |
| April | 13°C | 100 mm | 280 h | 10 |
| May | 18°C | 109 mm | 285 h | 9 |
| June | 24°C | 53 mm | 377 h | 9 |
| July | 26°C | 102 mm | 354 h | 11 |
| August | 23°C | 186 mm | 338 h | 12 |
| September | 20°C | 59 mm | 243 h | 12 |
| October | 14°C | 14 mm | 299 h | 7 |
| November | 9°C | 71 mm | 242 h | 9 |
| December | 2°C | 98 mm | 189 h | 10 |
About 3,252 hours of sun a year. Roughly 113 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.