Weatheo

Bismarck Weather by Month

Average temperatures, rainfall and humidity for Bismarck, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Bismarck month looks like before you travel — then check the live Bismarck forecast for the days ahead.

Warmest month

July

28°C average high

Coolest month

January

-15°C average low

Wettest month

May

56 mm of rain

Driest month

January

2 mm of rain

Average temperature and rainfall in Bismarck by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January-6°C-15°C-35°C / 11°C
2 mm
80%17 km/h
February-5°C-15°C-34°C / 15°C
2 mm
77%18 km/h
March3°C-7°C-30°C / 25°C
12 mm
73%19 km/h
April11°C0°C-16°C / 30°C
30 mm
67%20 km/h
May21°C9°C-4°C / 35°C
56 mm
59%18 km/h
June27°C15°C5°C / 38°C
51 mm
64%17 km/h
July28°C17°C7°C / 39°C
28 mm
70%14 km/h
August27°C16°C6°C / 36°C
48 mm
72%14 km/h
September23°C12°C-1°C / 36°C
30 mm
70%16 km/h
October14°C4°C-11°C / 34°C
36 mm
69%18 km/h
November4°C-4°C-25°C / 23°C
11 mm
76%17 km/h
December-3°C-12°C-32°C / 15°C
9 mm
80%17 km/h

Best time to visit Bismarck

The most comfortable time to visit Bismarck is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 317 mm a year.

Travellers who prefer heat should aim for July, when highs average 28°C. May is the month to avoid if rain would spoil your plans — it averages 56 mm, roughly 34× the rainfall of the driest month (January).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Bismarck forecast for what is happening now.

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