Click on a day for an hourly weather forecast
The temperatures in Arendal 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 Arendal 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 Arendal in September 2025.
If you’re planning to visit Arendal in the near future, we highly recommend that you review the 14 day weather forecast for Arendal before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -1° | 6 | 14 | 11 | 116 mm | Awful | Arendal in January |
| February | 2° / -2° | 7 | 11 | 11 | 108 mm | Awful | Arendal in February |
| March | 5° / 0° | 6 | 19 | 6 | 76 mm | Awful | Arendal in March |
| April | 9° / 4° | 5 | 24 | 1 | 48 mm | Ok | Arendal in April |
| May | 13° / 8° | 7 | 24 | 0 | 85 mm | Bad | Arendal in May |
| June | 17° / 11° | 6 | 24 | 0 | 83 mm | Good | Arendal in June |
| July | 19° / 13° | 6 | 25 | 0 | 89 mm | Good | Arendal in July |
| August | 19° / 13° | 7 | 24 | 0 | 130 mm | Ok | Arendal in August |
| September | 16° / 11° | 7 | 23 | 0 | 126 mm | Ok | Arendal in September |
| October | 11° / 7° | 9 | 21 | 0 | 153 mm | Bad | Arendal in October |
| November | 7° / 4° | 11 | 16 | 4 | 140 mm | Awful | Arendal in November |
| December | 4° / 1° | 10 | 14 | 7 | 133 mm | Awful | Arendal in December |