Alesund weather by month
Alesund runs from about -1°C in January to 15°C in August, with December the wettest month at 359 mm.
warmest month
August
15°C
coolest month
January
-1°C
wettest month
December
359 mm
worst air month
July
5 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -1°C | 226 mm | 41 h | 3 |
| February | 0°C | 187 mm | 97 h | 3 |
| March | 4°C | 94 mm | 200 h | 3 |
| April | 5°C | 102 mm | 239 h | 3 |
| May | 14°C | 48 mm | 389 h | 3 |
| June | 13°C | 145 mm | 304 h | 3 |
| July | 14°C | 182 mm | 297 h | 5 |
| August | 15°C | 224 mm | 243 h | 3 |
| September | 11°C | 207 mm | 210 h | 3 |
| October | 8°C | 347 mm | 86 h | 2 |
| November | 4°C | 223 mm | 55 h | 2 |
| December | 3°C | 359 mm | 11 h | 2 |
About 2,172 hours of sun a year. Roughly 224 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.