North Dakota (Bismarck)
September
Weather in North Dakota for September 2026
Your guide to North Dakota weather in September - trends and predictions
In general, the average temperature in North Dakota at the beginning of September is 20 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.6 °F by the end of September.
North Dakota experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 306.6 mm.
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Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
23°/13°
Temperatures
20 km/h
Avg max wind
69 %
Avg humidity
North Dakota Weather September
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What’s the Weather Like in North Dakota This September?
Discover the average temperatures and weather trends across North Dakota’s cities this September.
Temperatures trend during September in North Dakota
See the weather trend as well as the moving average line
September weather in North Dakota day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 27° /15° | 0 mm | 7 | |
| Sept. 2 |  Heavy rain at times | 27° /16° | 5.5 mm | 7 | |
| Sept. 3 |  Overcast | 17° /12° | 0 mm | 5 | |
| Sept. 4 |  Light rain shower | 18° /8° | 3.7 mm | 5 | |
| Sept. 5 | Overcast | 13° /9° | 0 mm | 5 | |
| Sept. 6 | Overcast | 16° /7° | 0 mm | 5 | |
| Sept. 7 |  Sunny | 22° /5° | 0 mm | 6 | |
| Sept. 8 | Sunny | 28° /10° | 0 mm | 6 | |
| Sept. 9 | Sunny | 28° /12° | 0 mm | 6 | |
| Sept. 10 | Sunny | 28° /14° | 0 mm | 5 | |
| Sept. 11 |  Thundery outbreaks possible | 27° /17° | 0 mm | 5 | |
| Sept. 12 |  Fog | 26° /19° | 0 mm | 5 | |
| Sept. 13 |  Moderate or heavy rain shower | 21° /17° | 75.8 mm | 1 | |
| Sept. 14 | Light rain shower | 25° /18° | 14 mm | 1 | |
| Sept. 15 |  Moderate or heavy rain with thunder | 26° /15° | 43.4 mm | 3 | |
| Sept. 16 | Fog | 28° /15° | 0 mm | 5 | |
| Sept. 17 | Light rain shower | 22° /17° | 6 mm | 1 | |
| Sept. 18 |  Heavy rain | 13° /12° | 155.6 mm | 1 | |
| Sept. 19 |  Light rain | 14° /12° | 2.6 mm | 1 | |
| Sept. 20 | Mist | 19° /13° | 0 mm | 2 | |
| Sept. 21 | Mist | 24° /12° | 0 mm | 4 | |
| Sept. 22 | Sunny | 26° /12° | 0 mm | 4 | |
| Sept. 23 | Sunny | 23° /12° | 0 mm | 4 | |
| Sept. 24 | Sunny | 25° /11° | 0 mm | 4 | |
| Sept. 25 | Sunny | 25° /13° | 0 mm | 4 | |
| Sept. 26 | Sunny | 27° /10° | 0 mm | 4 | |
| Sept. 27 | Sunny | 22° /9° | 0 mm | 3 | |
| Sept. 28 | Sunny | 25° /10° | 0 mm | 3 | |
| Sept. 29 | Thundery outbreaks possible | 28° /16° | 0 mm | 3 | |
| Sept. 30 | Thundery outbreaks possible | 27° /19° | 0 mm | 3 | |
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Important Notice
Our weather forecast for North Dakota in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the North Dakota forecast closer to your planned date for the most up-to-date weather information.
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North Dakota in September - FAQ
What are the expected maximum and minimum temperatures in North Dakota during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in North Dakota during September?
Significant rainfall exceeding 306.6 mm is expected in North Dakota during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in North Dakota during September?
The average wind speed in North Dakota during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in North Dakota
Explore the daily rainfall trends and prepare for North Dakotas September weather 💧
Typically, North Dakota has 8 rainy days in September with a total of 306.6 mm of rainfall.
UV exposure in North Dakota during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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