Monthly climate guide
Zagreb weather in September
With highs near 24°C (74°F) and lows around 12°C (54°F), September feels warm in Zagreb. Rainfall averages about 105 mm (wet) and the sky is often cloudy. Daytime highs are 6°C cooler than August and 6°C warmer than October.
What stands out in September
- Just 130 km apart, but Zagreb runs about 4°C warmer than Rijeka this month.
- Rain is above Zagreb's usual level, by about 41%.
- September brings early autumn to Zagreb.
- It cools down fast from here: October is about 6°C cooler.
It's usually the wettest month of the year.
Avg high
24°C
74°F
Avg low
12°C
54°F
Rainfall
105 mm
wet
Humidity
70%
relative
Sky
58%
cloud · often cloudy
Zagreb weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 4°C / 39°F | -3°C / 27°F | 51 mm | 92% | 74% |
| February | 5°C / 42°F | -2°C / 28°F | 72 mm | 89% | 75% |
| March | 11°C / 53°F | 1°C / 34°F | 51 mm | 81% | 63% |
| April | 17°C / 63°F | 6°C / 42°F | 49 mm | 75% | 64% |
| May | 21°C / 69°F | 10°C / 50°F | 104 mm | 74% | 66% |
| June | 26°C / 79°F | 15°C / 59°F | 83 mm | 69% | 56% |
| July | 29°C / 84°F | 17°C / 63°F | 82 mm | 62% | 49% |
| August | 30°C / 85°F | 17°C / 62°F | 65 mm | 59% | 43% |
| September | 24°C / 74°F | 12°C / 54°F | 105 mm | 70% | 58% |
| October | 17°C / 63°F | 7°C / 44°F | 92 mm | 82% | 65% |
| November | 10°C / 50°F | 3°C / 37°F | 83 mm | 90% | 75% |
| December | 5°C / 41°F | -1°C / 30°F | 59 mm | 92% | 70% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Zagreb?
Compare the months in the chart above to find your ideal window.
Best time to visit Zagreb →Other Croatia cities in September
Cite or embed this data
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Zagreb weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/croatia/zagreb/september
<a href="https://weathercompare.eu/weather/croatia/zagreb/september">Zagreb weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/croatia/zagreb" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Zagreb weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/croatia/zagreb/september">Zagreb weather in September</a> – WeatherCompare</p>
Zagreb in September: quick answers
Is September a good time to visit Zagreb?
September is one of the wetter months in Zagreb, with about 105 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Zagreb in September?
Average highs are about 24°C (74°F) and average lows about 12°C (54°F), based on 10 years of daily data.
Does it rain a lot in Zagreb in September?
Zagreb typically gets around 105 mm of rain in September — wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Zagreb (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.