Click on a day for an hourly weather forecast
The temperatures in Hameenlinna in September are quite cold with temperatures between 7°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Hameenlinna 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 Hameenlinna in September 2025.
If you’re planning to visit Hameenlinna in the near future, we highly recommend that you review the 14 day weather forecast for Hameenlinna before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -8° | 4 | 4 | 24 | 62 mm | Awful | Hameenlinna in January |
| February | -3° / -8° | 3 | 4 | 21 | 56 mm | Awful | Hameenlinna in February |
| March | 0° / -5° | 5 | 7 | 20 | 52 mm | Awful | Hameenlinna in March |
| April | 7° / 0° | 7 | 14 | 10 | 55 mm | Awful | Hameenlinna in April |
| May | 15° / 5° | 6 | 23 | 1 | 67 mm | Good | Hameenlinna in May |
| June | 20° / 9° | 7 | 23 | 0 | 93 mm | Ok | Hameenlinna in June |
| July | 22° / 12° | 6 | 25 | 0 | 103 mm | Good | Hameenlinna in July |
| August | 21° / 11° | 5 | 26 | 0 | 84 mm | Good | Hameenlinna in August |
| September | 15° / 7° | 6 | 24 | 0 | 66 mm | Good | Hameenlinna in September |
| October | 7° / 3° | 7 | 20 | 4 | 70 mm | Awful | Hameenlinna in October |
| November | 3° / -1° | 7 | 13 | 10 | 71 mm | Awful | Hameenlinna in November |
| December | -2° / -5° | 6 | 6 | 20 | 66 mm | Awful | Hameenlinna in December |