Tallinn weather by month
Tallinn runs from about -6°C in January to 19°C in July, with July the wettest month at 125 mm.
warmest month
July
19°C
coolest month
January
-6°C
wettest month
July
125 mm
worst air month
January
11 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -6°C | 40 mm | 48 h | 11 |
| February | -2°C | 39 mm | 89 h | 10 |
| March | 2°C | 30 mm | 164 h | 10 |
| April | 5°C | 59 mm | 206 h | 5 |
| May | 13°C | 16 mm | 465 h | 5 |
| June | 17°C | 105 mm | 452 h | 5 |
| July | 19°C | 125 mm | 374 h | 7 |
| August | 18°C | 88 mm | 391 h | 4 |
| September | 15°C | 76 mm | 287 h | 5 |
| October | 9°C | 59 mm | 185 h | 6 |
| November | 4°C | 84 mm | 82 h | 8 |
| December | 1°C | 77 mm | 46 h | 7 |
About 2,789 hours of sun a year. Roughly 82 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.