North Dakota weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in North Dakota in September. Check more long-term weather averages for North Dakota in September before you book your next holiday to North Dakota in 2025/2026.

  • 21°C maximum daytime temperature in September in North Dakota (Bismarck)21
    21°C max day temperature
  • 8 hours of sunshine per day
  • 7 days with some rainfall in September in North Dakota (Bismarck)7
    7 days with some rainfall
  • 6°C minimum night-time temperature in September in North Dakota (Bismarck)6
    6°C min night temperature
  • 13 hours of daylight per day in September in North Dakota (Bismarck)13
    13 hours of daylight per day
  • No heat & humidity in September in North Dakota (Bismarck)0
    No heat & humidity
  • 37 mm monthly rainfall in September in North Dakota (Bismarck)37
    37 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in North Dakota (Bismarck)5
    5 (Moderate) UV index

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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.

Top North Dakota destinations

Below are average maximum temperatures at popular countries, regions and places in North Dakota in September. Select a holiday destination to see more weather parameters.

All North Dakota destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in North Dakota in September?

Daytime temperatures usually reach 21°C in Bismarck, North Dakota in September, falling to 6°C at night.

How sunny is it in North Dakota in September?

There are normally 8 hours of bright sunshine each day in Bismarck, North Dakota in September - that's 65% of daylight hours.

Does it rain in North Dakota in September?

There are usually 7 days with some rain in Bismarck, North Dakota in September and the average monthly rainfall is 37mm.

North Dakota September sunrise & sunset times

Browse the sunrise and sunset times for North Dakota in September 2025. Select a month to view North Dakota sunrise and sunset times for the next 12 months. The North Dakota sunrise and sunset times shown below are for Bismarck.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:03 19:22
Monday, 15th September 2025 06:21 18:54
Tuesday, 30th September 2025 06:41 18:24

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