Zagreb weather by month
Zagreb runs from about 2°C in January to 25°C in August, with September the wettest month at 151 mm.
warmest month
August
25°C
coolest month
January
2°C
wettest month
September
151 mm
worst air month
December
49 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 2°C | 66 mm | 178 h | 40 |
| February | 8°C | 39 mm | 205 h | 32 |
| March | 10°C | 96 mm | 251 h | 24 |
| April | 13°C | 38 mm | 310 h | 14 |
| May | 17°C | 127 mm | 339 h | 9 |
| June | 21°C | 98 mm | 355 h | 8 |
| July | 24°C | 85 mm | 408 h | 7 |
| August | 25°C | 104 mm | 394 h | 9 |
| September | 17°C | 151 mm | 258 h | 9 |
| October | 13°C | 98 mm | 213 h | 13 |
| November | 5°C | 70 mm | 162 h | 22 |
| December | 3°C | 43 mm | 145 h | 49 |
About 3,218 hours of sun a year. Roughly 103 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.