Glasgow weather by month
Glasgow runs from about 3°C in January to 14°C in August, with August the wettest month at 236 mm.
warmest month
August
14°C
coolest month
January
3°C
wettest month
August
236 mm
worst air month
October
8 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 3°C | 110 mm | 105 h | 7 |
| February | 6°C | 128 mm | 111 h | 6 |
| March | 6°C | 109 mm | 168 h | 7 |
| April | 8°C | 135 mm | 211 h | 5 |
| May | 13°C | 134 mm | 267 h | 5 |
| June | 12°C | 65 mm | 314 h | 4 |
| July | 14°C | 75 mm | 285 h | 5 |
| August | 14°C | 236 mm | 276 h | 6 |
| September | 12°C | 47 mm | 202 h | 4 |
| October | 10°C | 86 mm | 140 h | 8 |
| November | 7°C | 51 mm | 92 h | 5 |
| December | 6°C | 131 mm | 54 h | 6 |
About 2,225 hours of sun a year. Roughly 133 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.