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Bismarck weather in September 2026
Expect daytime maximum temperatures of 21°C in Bismarck, North Dakota in September based on long-term weather averages. There are 8 hours of sunshine per day on average.
- 21°C max day temperature
21 - 8 hours of sunshine per day
- 7 days with some rainfall
7 - 6°C min night temperature
6 - 13 hours of daylight per day
13 - No heat & humidity
0 - 37 mm of monthly rainfall
37 - 5 (Moderate) UV index
5
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Recommended for North Dakota
The September weather guide for North Dakota (Bismarck) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Bismarck in September?
Daytime temperatures usually reach 21°C in Bismarck in September, falling to 6°C at night.
How sunny is it in Bismarck in September?
There are normally 8 hours of bright sunshine each day in Bismarck in September - that's 65% of daylight hours.
Does it rain in Bismarck in September?
There are usually 7 days with some rain in Bismarck in September and the average monthly rainfall is 37mm.
Bismarck September sunrise & sunset times
Browse the sunrise and sunset times for Bismarck in September 2026. Select a month to view Bismarck sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 06:03 | 19:22 |
| Tuesday, 15th September 2026 | 06:21 | 18:55 |
| Wednesday, 30th September 2026 | 06:41 | 18:25 |
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