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Zagreb in September: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Zagreb in September will be like? Take a look at our weather guide for Zagreb, based on historical data.
Check flight prices to Zagreb on Avionero:
September

Weather in Zagreb in September 2025

OK Weather
Mild
☀️
Sunny
If you plan to visit Zagreb in September, the weather is typically alright, with an average high temperature of +22°C during the day and approximately 11 sunny days. Expect some rainy, though, as there are typically 11 rainy days in the month and around 89 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flights in one click on Avionero.

Average weather

☀️
+22°C
Avg. max. temperature
+1°C
Min.
+33°C
Max.
89 mm
Total precipitation
77%
Avg. humidity
1 m/s
Avg. wind
11 ☀️
Sunny Days
5 ⛅️
Cloudy
11 🌦
Rainy
Our opinion: Zagreb has OK weather in September.

Average temperature in Zagreb in September

Here are the expected maximum, average and minimum temperatures in Zagreb for September based on the historical data.
Last Year
Historical Data

Going from a maximum of +30°C during the day to a minimum of +11°C during the night, the temperature in September averages around +26°C.

The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +27°C to +25°C.

Is Zagreb warm or cold in September?

Zagreb is typically mild in September.

Maximum temperatures go down compared to the previous month from +27°C to +22°C. The minimum temperature also goes down from +16°C to +12°C.

Pack a light jacket as it will be warm in the day and cool in the evenings.

Take a look at how September is compared to other months in Zagreb:

Climate in Zagreb in September

Zagreb weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+27°C+22°C+17°C
Min. temperature
+6°C+1°C-5°C
Max. temperature
+39°C+33°C+28°C
Rainfall
78 mm89 mm76 mm
Wind
1 m/s1 m/s1 m/s
Humidity
71%77%82%
Air pressure
1014 HPa1016 HPa1018 HPa
Sunny days
13118
Cloudy days
3511
Rainy days
91110
Snowy days
000

September typically has worse weather conditions compared to August. It’s getting colder in September. From +27°C in the day, the average maximum temperature lowers to +22°C. Prepare for more rain. Average rainfall goes from 78 mm to 89 mm. Humidity rises from 71% to 77%. The average wind speed doesn’t change much during September, staying around 1 m/s. The days becoming less sunny, going from 13 sunny days in August to 11 in September.

October brings much the same weather, it remains ok.

Wind

Wind speed in Zagreb in September based on historical data.
Last Year
Historical Data

The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.

The average wind speed in Zagreb is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Zagreb based on historical data.
Last Year
Historical Data
Typically, there is a 20% chance of rain on an average day in September, with total rainfall of approximately 75 mm. The maximum amount of rainfall per day is around 42 mm, which is moderate rain. On average, there are about 6 rainy days during September, so prepare to bring an umbrella.
September is one of the rainiest months in Zagreb, here is a comparison with other months, total mm:
Zagreb wettest month is September, where a typical day has a 37% chance of precipitation and 89 mm of rainfall per day. January, on the other hand, is the driest month with a mere 16% chance of precipitation and 29 mm of rainfall per day.

How was the weather last September in Zagreb?

This is the weather in Zagreb in September 2023:
1 September
☀️
+27°C
2 September
☀️
+29°C
3 September
☀️
+27°C
4 September
☀️
+24°C
5 September
☀️
+25°C
6 September
☀️
+28°C
7 September
☀️
+28°C
8 September
☀️
+29°C
9 September
☀️
+29°C
10 September
☀️
+30°C
11 September
☀️
+30°C
12 September
☀️
+30°C
13 September
☀️
+29°C
14 September
🌧️
+23°C
15 September
☀️
+25°C
16 September
☀️
+27°C
17 September
☀️
+28°C
18 September
☀️
+28°C
19 September
☀️
+25°C
20 September
☀️
+26°C
21 September
☀️
+26°C
22 September
☀️
+28°C
23 September
🌧️
+20°C
24 September
🌧️
+15°C
25 September
☁️
+18°C
26 September
☀️
+26°C
27 September
☀️
+27°C
28 September
☀️
+26°C
29 September
☀️
+26°C
30 September
☀️
+25°C
In September 2023 Zagreb had 26 sunny days, 1 cloudy days, and 3 rainy days. The average maximum temperature was +26°C, with an absolute maximum of +30°C and a minimum of +15°C. The average humidity was 75%, with a maximum of 100% and a minimum of 40%. The average wind speed was 2 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Zagreb climate have been changing during last 43 years period.

The climate in Zagreb in September has not changed much over the last 43 years.

The average temperature was the lowest in 1980 (+14°C) and the highest in 2022 (+18°C). The driest year was 2011 with only 471 mm of rainfall, and the wettest year was 2019 with 1707 mm.

FAQ

Frequently asked questions about the weather in Zagreb in September:

Is September a good time to visit Zagreb?

It’s always a good time to visit Zagreb, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Zagreb in September?

September has mild temperatures in Zagreb. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Is Zagreb rainy in September?

Zagreb is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Zagreb in September?

The amount of sunny days in Zagreb during September varies; prepare for a mix of clouds and sun.

Other cities in Croatia

Check out the weather for other cities in Croatia.

Monthly weather in Zagreb

Source of the data

For this page, we’ve looked at the typical weather in Zagreb, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.