WEATHER · CLIMATE NORMALS · 1991–2020
Zagreb Climate — Averages by Month
What the weather in Zagreb, HRaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 1.1 °C · coldest | 54.4 mm |
| February | 2.9 °C | 60.2 mm |
| March | 7.3 °C | 63.2 mm |
| April | 12.1 °C | 71.7 mm |
| May | 16.7 °C | 91.5 mm |
| June | 20.7 °C | 87.8 mm |
| July | 22.7 °C · warmest | 80.3 mm |
| August | 22.3 °C | 84.3 mm |
| September | 17.0 °C | 97.2 mm · wettest |
| October | 11.9 °C | 82.7 mm |
| November | 6.8 °C | 84.8 mm |
| December | 1.9 °C | 72.3 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Zagreb — centred at 45.75°N, 16.00°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.