Climate averages 1991–2020
Zagreb weather
in September.
A mild, wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Zagreb: daytime highs average 21.8°C and nights cool to about 12.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 94 mm of rain on roughly 10 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 35 min on an average September day.
The nearest other city in this atlas is Maribor (86 km away). In September its highs average 20.5°C, 1.3°C cooler than Zagreb, with 111 mm of rain.
Among the 4 cities listed in Croatia, Zagreb ranks 4th of 4 for the warmest September highs and 2nd of 4 for the driest September (rainfall, lowest first). The mean September high of those 4 cities is 22.7°C; Zagreb is 0.9°C cooler than that mean.
From September to October, average highs fall by 5.2°C to 16.6°C, and monthly rainfall falls from 94 mm to 80 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Zagreb climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C-2.2°C | -2.2°C | 49 | 8.0 | 9.19 h |
| February | 7.2°C-1.6°C | -1.6°C | 56 | 8.3 | 10.310 h |
| March | 12.1°C1.8°C | 1.8°C | 59 | 9.5 | 11.912 h |
| April | 16.9°C6.1°C | 6.1°C | 67 | 10.5 | 13.514 h |
| May | 21.2°C10.8°C | 10.8°C | 87 | 12.7 | 14.915 h |
| June | 25.2°C15.0°C | 15.0°C | 84 | 11.4 | 15.716 h |
| July | 27.5°C17.2°C | 17.2°C | 77 | 10.6 | 15.315 h |
| August | 27.4°C17.3°C | 17.3°C | 81 | 9.4 | 14.114 h |
| September, selected | 21.8°C12.6°C | 12.6°C | 94 | 10.0 | 12.613 h |
| October | 16.6°C8.1°C | 8.1°C | 80 | 9.1 | 11.011 h |
| November | 10.5°C3.6°C | 3.6°C | 80 | 9.6 | 9.510 h |
| December | 5.1°C-1.2°C | -1.2°C | 68 | 9.5 | 8.79 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Maribor in SeptemberSlovenia · 86 kmHigh 20.5°C · Low 11.9°C · 111 mm rain
- Bihać in SeptemberBosnia and Herzegovina · 111 kmHigh 21.6°C · Low 12.4°C · 124 mm rain
- Ljubljana in SeptemberSlovenia · 117 kmHigh 19.8°C · Low 11.5°C · 125 mm rain
- Rijeka in SeptemberCroatia · 131 kmHigh 22.3°C · Low 14.8°C · 177 mm rain
- Graz in SeptemberAustria · 145 kmHigh 19.2°C · Low 9.7°C · 83 mm rain
- Banja Luka in SeptemberBosnia and Herzegovina · 150 kmHigh 22.2°C · Low 12.0°C · 95 mm rain
- Klagenfurt am Wörthersee in SeptemberAustria · 157 kmHigh 19.2°C · Low 11.1°C · 139 mm rain
- Szombathely in SeptemberHungary · 165 kmHigh 20.4°C · Low 11.7°C · 76 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Zagreb) is explained once on the Zagreb year overview and on the Sources, method and limits page.