Click on a day for an hourly weather forecast
The temperatures in Karlshamn in September are usually low and can range between 12°C and 17°C.
You can expect about 3 to 8 days of rain in Karlshamn 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 Karlshamn in September 2025.
If you’re planning to visit Karlshamn in the near future, we highly recommend that you review the 14 day weather forecast for Karlshamn before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / 0° | 7 | 11 | 13 | 56 mm | Awful | Karlshamn in January |
| February | 2° / -1° | 7 | 9 | 13 | 45 mm | Awful | Karlshamn in February |
| March | 5° / 1° | 5 | 19 | 6 | 40 mm | Awful | Karlshamn in March |
| April | 9° / 4° | 4 | 24 | 2 | 31 mm | Bad | Karlshamn in April |
| May | 14° / 8° | 4 | 27 | 0 | 45 mm | Good | Karlshamn in May |
| June | 18° / 12° | 4 | 26 | 0 | 59 mm | Good | Karlshamn in June |
| July | 21° / 15° | 6 | 25 | 0 | 96 mm | Good | Karlshamn in July |
| August | 20° / 15° | 5 | 26 | 0 | 71 mm | Good | Karlshamn in August |
| September | 17° / 12° | 4 | 26 | 0 | 48 mm | Good | Karlshamn in September |
| October | 12° / 8° | 5 | 26 | 0 | 64 mm | Ok | Karlshamn in October |
| November | 8° / 5° | 7 | 21 | 2 | 68 mm | Awful | Karlshamn in November |
| December | 4° / 1° | 8 | 15 | 9 | 54 mm | Awful | Karlshamn in December |