Click on a day for an hourly weather forecast
The temperatures in Lohja in September are quite cold with temperatures between 8°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Lohja 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 Lohja in September 2026.
If you’re planning to visit Lohja in the near future, we highly recommend that you review the 14 day weather forecast for Lohja before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -7° | 5 | 6 | 21 | 49 mm | Awful | Lohja in January |
| February | -3° / -7° | 4 | 6 | 19 | 45 mm | Awful | Lohja in February |
| March | 1° / -5° | 6 | 8 | 18 | 41 mm | Awful | Lohja in March |
| April | 7° / 0° | 5 | 17 | 8 | 35 mm | Bad | Lohja in April |
| May | 14° / 6° | 5 | 25 | 1 | 50 mm | Good | Lohja in May |
| June | 19° / 10° | 5 | 25 | 0 | 60 mm | Good | Lohja in June |
| July | 22° / 13° | 5 | 26 | 0 | 73 mm | Good | Lohja in July |
| August | 20° / 12° | 5 | 26 | 0 | 67 mm | Good | Lohja in August |
| September | 15° / 8° | 4 | 26 | 0 | 50 mm | Good | Lohja in September |
| October | 8° / 4° | 6 | 22 | 3 | 58 mm | Bad | Lohja in October |
| November | 4° / 1° | 7 | 16 | 8 | 56 mm | Awful | Lohja in November |
| December | -1° / -4° | 7 | 6 | 18 | 57 mm | Awful | Lohja in December |