Reykjavík weather by month
Reykjavík runs from about -2°C in February to 11°C in July, with December the wettest month at 198 mm.
warmest month
July
11°C
coolest month
February
-2°C
wettest month
December
198 mm
worst air month
August
4 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 0°C | 145 mm | 27 h | 2 |
| February | -2°C | 86 mm | 111 h | 2 |
| March | 1°C | 119 mm | 216 h | 2 |
| April | 3°C | 73 mm | 255 h | 3 |
| May | 7°C | 154 mm | 244 h | 2 |
| June | 8°C | 103 mm | 283 h | 3 |
| July | 11°C | 167 mm | 187 h | 4 |
| August | 10°C | 152 mm | 247 h | 4 |
| September | 7°C | 84 mm | 193 h | 3 |
| October | 3°C | 131 mm | 146 h | 3 |
| November | 1°C | 181 mm | 75 h | 3 |
| December | -1°C | 198 mm | 12 h | 2 |
About 1,996 hours of sun a year. Roughly 159 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.