Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -4° | 5 | 8 | 18 | 52 mm | Awful | Warsaw in January |
| February | 2° / -3° | 5 | 9 | 14 | 46 mm | Awful | Warsaw in February |
| March | 7° / 1° | 5 | 19 | 7 | 44 mm | Bad | Warsaw in March |
| April | 14° / 5° | 5 | 23 | 2 | 53 mm | Ok | Warsaw in April |
| May | 19° / 9° | 8 | 23 | 0 | 113 mm | Ok | Warsaw in May |
| June | 24° / 13° | 6 | 24 | 0 | 88 mm | Perfect | Warsaw in June |
| July | 25° / 15° | 6 | 25 | 0 | 107 mm | Perfect | Warsaw in July |
| August | 25° / 15° | 4 | 27 | 0 | 72 mm | Perfect | Warsaw in August |
| September | 20° / 11° | 5 | 25 | 0 | 60 mm | Good | Warsaw in September |
| October | 13° / 6° | 5 | 25 | 1 | 58 mm | Ok | Warsaw in October |
| November | 7° / 3° | 5 | 22 | 3 | 48 mm | Bad | Warsaw in November |
| December | 2° / -1° | 6 | 13 | 12 | 47 mm | Awful | Warsaw in December |