Click on a day for an hourly weather forecast
The temperatures in Sarpsborg in September are usually low and can range between 11°C and 16°C.
You can expect about 3 to 8 days of rain in Sarpsborg 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 Sarpsborg in September 2026.
If you’re planning to visit Sarpsborg in the near future, we highly recommend that you review the 14 day weather forecast for Sarpsborg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -3° | 5 | 15 | 11 | 50 mm | Awful | Sarpsborg in January |
| February | 0° / -3° | 5 | 12 | 12 | 48 mm | Awful | Sarpsborg in February |
| March | 4° / 0° | 5 | 19 | 7 | 44 mm | Awful | Sarpsborg in March |
| April | 9° / 4° | 4 | 24 | 2 | 40 mm | Bad | Sarpsborg in April |
| May | 13° / 8° | 6 | 25 | 0 | 76 mm | Ok | Sarpsborg in May |
| June | 17° / 12° | 4 | 26 | 0 | 70 mm | Good | Sarpsborg in June |
| July | 19° / 14° | 6 | 25 | 0 | 103 mm | Good | Sarpsborg in July |
| August | 19° / 14° | 6 | 25 | 0 | 108 mm | Good | Sarpsborg in August |
| September | 16° / 11° | 5 | 25 | 0 | 84 mm | Good | Sarpsborg in September |
| October | 10° / 7° | 7 | 24 | 0 | 89 mm | Bad | Sarpsborg in October |
| November | 6° / 3° | 7 | 19 | 3 | 76 mm | Awful | Sarpsborg in November |
| December | 2° / 0° | 7 | 15 | 9 | 60 mm | Awful | Sarpsborg in December |