Click on a day for an hourly weather forecast
The temperatures in Gdansk in September are usually low and can range between 12°C and 18°C.
You can expect about 3 to 8 days of rain in Gdansk 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 Gdansk in September 2025.
If you’re planning to visit Gdansk in the near future, we highly recommend that you review the 14 day weather forecast for Gdansk before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -2° | 8 | 6 | 18 | 79 mm | Awful | Gdansk in January |
| February | 2° / -2° | 6 | 7 | 16 | 60 mm | Awful | Gdansk in February |
| March | 6° / 1° | 7 | 14 | 10 | 59 mm | Awful | Gdansk in March |
| April | 12° / 4° | 5 | 21 | 4 | 49 mm | Bad | Gdansk in April |
| May | 16° / 8° | 6 | 25 | 0 | 84 mm | Good | Gdansk in May |
| June | 20° / 12° | 7 | 23 | 0 | 104 mm | Ok | Gdansk in June |
| July | 22° / 14° | 8 | 23 | 0 | 156 mm | Ok | Gdansk in July |
| August | 22° / 15° | 6 | 25 | 0 | 110 mm | Good | Gdansk in August |
| September | 18° / 12° | 5 | 25 | 0 | 82 mm | Good | Gdansk in September |
| October | 12° / 7° | 6 | 25 | 0 | 75 mm | Ok | Gdansk in October |
| November | 7° / 4° | 8 | 18 | 4 | 76 mm | Awful | Gdansk in November |
| December | 3° / 0° | 9 | 9 | 13 | 80 mm | Awful | Gdansk in December |