The temperatures in Warsaw in September are usually low and can range between 11°C and 20°C.
You can expect about 3 to 8 days of rain in Warsaw during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Warsaw in September 2025.
If you’re planning to visit Warsaw in the near future, we highly recommend that you review the 14 day weather forecast for Warsaw before you arrive.
Temperatures
20° / 11°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
60
mm
Sun Hours
9.7
Hrs
