Grimstad in September
6.3out of 10
Possible, with caveats
Mild: highs around 16°C. Frequent rain: about 13 rainy days.
16°CAvg high
11°CAvg low
13Rainy days (106 mm)
12:29 hDaylight
07:06Sunrise · 19:34 Sunset
Why this score
- Mild: highs around 16°C
- Frequent rain: about 13 rainy days
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.9 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 3°C | 0°C | 107 mm | 14 | – | – | 3.9 |
| February | 3°C | -1°C | 81 mm | 12 | – | – | 4.3 |
| March | 5°C | 0°C | 70 mm | 10 | – | – | 4.9 |
| April | 9°C | 4°C | 58 mm | 10 | – | – | 5.7 |
| May | 14°C | 8°C | 63 mm | 10 | – | – | 6.5 |
| June | 18°C | 11°C | 75 mm | 10 | – | – | 7.1 |
| July | 20°C | 14°C | 72 mm | 10 | – | – | 7.5 |
| August | 20°C | 13°C | 101 mm | 12 | – | – | 7.0 |
| September | 16°C | 11°C | 106 mm | 13 | – | – | 6.3 |
| October | 11°C | 7°C | 119 mm | 14 | – | – | 5.3 |
| November | 7°C | 3°C | 115 mm | 15 | – | – | 4.6 |
| December | 4°C | 1°C | 104 mm | 14 | – | – | 4.1 |
Frequently asked questions
How hot is Grimstad in September?
Daytime highs average 16°C and nights about 11°C.
When is the best time to visit Grimstad?
The best months are July, June, August.