Click on a day for an hourly weather forecast
The temperatures in Trosa in September are usually low and can range between 10°C and 17°C.
You can expect about 3 to 8 days of rain in Trosa 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 Trosa in September 2026.
If you’re planning to visit Trosa in the near future, we highly recommend that you review the 14 day weather forecast for Trosa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -4° | 9 | 19 | 4 | 42 mm | Awful | Trosa in January |
| February | 1° / -4° | 7 | 18 | 3 | 32 mm | Awful | Trosa in February |
| March | 4° / -2° | 6 | 22 | 3 | 40 mm | Awful | Trosa in March |
| April | 10° / 2° | 5 | 24 | 1 | 30 mm | Ok | Trosa in April |
| May | 16° / 6° | 7 | 23 | 0 | 54 mm | Ok | Trosa in May |
| June | 20° / 11° | 8 | 22 | 0 | 66 mm | Ok | Trosa in June |
| July | 22° / 14° | 9 | 22 | 0 | 71 mm | Ok | Trosa in July |
| August | 21° / 13° | 9 | 22 | 0 | 76 mm | Ok | Trosa in August |
| September | 17° / 10° | 6 | 24 | 0 | 55 mm | Good | Trosa in September |
| October | 10° / 5° | 7 | 24 | 0 | 57 mm | Bad | Trosa in October |
| November | 6° / 2° | 6 | 23 | 0 | 50 mm | Bad | Trosa in November |
| December | 2° / -2° | 8 | 20 | 3 | 46 mm | Awful | Trosa in December |