Click on a day for an hourly weather forecast
The temperatures in Gdynia in September are usually low and can range between 13°C and 18°C.
You can expect about 3 to 8 days of rain in Gdynia 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 Gdynia in September 2025.
If you’re planning to visit Gdynia in the near future, we highly recommend that you review the 14 day weather forecast for Gdynia before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -1° | 7 | 9 | 15 | 62 mm | Awful | Gdynia in January |
| February | 2° / -1° | 5 | 10 | 14 | 47 mm | Awful | Gdynia in February |
| March | 5° / 1° | 6 | 17 | 8 | 46 mm | Awful | Gdynia in March |
| April | 10° / 4° | 4 | 23 | 3 | 35 mm | Bad | Gdynia in April |
| May | 15° / 8° | 5 | 26 | 0 | 53 mm | Good | Gdynia in May |
| June | 19° / 12° | 4 | 26 | 0 | 67 mm | Good | Gdynia in June |
| July | 21° / 15° | 6 | 25 | 0 | 115 mm | Good | Gdynia in July |
| August | 22° / 15° | 5 | 26 | 0 | 88 mm | Good | Gdynia in August |
| September | 18° / 13° | 3 | 27 | 0 | 62 mm | Good | Gdynia in September |
| October | 12° / 8° | 5 | 26 | 0 | 52 mm | Ok | Gdynia in October |
| November | 7° / 5° | 7 | 21 | 3 | 58 mm | Awful | Gdynia in November |
| December | 3° / 1° | 7 | 15 | 10 | 65 mm | Awful | Gdynia in December |