Trondheim in September
5.8out of 10
Possible, with caveats
Cool: highs only around 14°C. Very wet: about 15 rainy days.
14°CAvg high
7°CAvg low
15Rainy days (102 mm)
12:36 hDaylight
06:55Sunrise · 19:30 Sunset
Why this score
- Cool: highs only around 14°C
- Very wet: about 15 rainy days
- Rain varies a lot between years (±5.6 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 (±5.6 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 | 0°C | -5°C | 96 mm | 16 | – | – | 3.0 |
| February | 1°C | -5°C | 85 mm | 14 | – | – | 3.3 |
| March | 4°C | -3°C | 88 mm | 16 | – | – | 3.7 |
| April | 9°C | 1°C | 67 mm | 14 | – | – | 5.1 |
| May | 13°C | 5°C | 70 mm | 16 | – | – | 5.6 |
| June | 16°C | 8°C | 95 mm | 16 | – | – | 6.0 |
| July | 19°C | 11°C | 85 mm | 15 | – | – | 6.7 |
| August | 19°C | 10°C | 99 mm | 15 | – | – | 6.4 |
| September | 14°C | 7°C | 102 mm | 15 | – | – | 5.8 |
| October | 8°C | 3°C | 87 mm | 15 | – | – | 4.8 |
| November | 3°C | -1°C | 79 mm | 13 | – | – | 4.1 |
| December | 1°C | -4°C | 95 mm | 15 | – | – | 3.2 |
Frequently asked questions
How hot is Trondheim in September?
Daytime highs average 14°C and nights about 7°C.
When is the best time to visit Trondheim?
The best months are July, August.