Grand Forks in September
7.8out of 10
Yes, a good time to go
Mild: highs around 21°C. Some rain: about 8 rainy days.
21°CAvg high
9°CAvg low
8Rainy days (68 mm)
12:20 hDaylight
07:13Sunrise · 19:32 Sunset
Why this score
- Mild: highs around 21°C
- Some rain: about 8 rainy days
What to wear and pack
- Layers you can add or remove
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±3.0 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 | -9°C | -18°C | 18 mm | 5 | – | – | 4.4 |
| February | -6°C | -15°C | 16 mm | 4 | – | – | 4.5 |
| March | 2°C | -8°C | 30 mm | 6 | – | – | 4.5 |
| April | 12°C | 0°C | 44 mm | 7 | – | – | 6.4 |
| May | 20°C | 7°C | 86 mm | 11 | – | – | 7.2 |
| June | 25°C | 14°C | 104 mm | 12 | – | – | 7.3 |
| July | 27°C | 16°C | 89 mm | 10 | – | – | 7.7 |
| August | 26°C | 14°C | 81 mm | 9 | – | – | 7.8 |
| September | 21°C | 9°C | 68 mm | 8 | – | – | 7.8 |
| October | 12°C | 2°C | 58 mm | 8 | – | – | 6.4 |
| November | 2°C | -6°C | 29 mm | 5 | – | – | 4.7 |
| December | -6°C | -14°C | 25 mm | 6 | – | – | 4.3 |
Frequently asked questions
How hot is Grand Forks in September?
Daytime highs average 21°C and nights about 9°C.
When is the best time to visit Grand Forks?
The best months are August, September, July, June.