Bismarck, ND Weather
Bismarck hourly forecast: next 24 hours
Today's high of 64°F (18°C) is about 9°F (5°C) below the typical September high of 73°F (23°C).
Current conditions in detail
Bismarck weather tomorrow (Wednesday, September 16)
Tomorrow in Bismarck looks sunny, with a high of 76° and an overnight low of 49°. Precipitation chance is modest at 17%. Winds top out near 16 mph, and the UV index reaches 4 (moderate).
Bismarck 14-day forecast
About the weather in Bismarck
Bismarck runs one of the wider annual swings in our dataset: 32°C separates the average July from the average January. Afternoons reach 83°F (28°C) at the peak of summer and 24°F (-5°C) at the depth of winter, with 78 days of measurable precipitation through the year.
Bismarck weather: quick facts
- Hottest month: July - highs near 83°F (28°C)
- Coldest month: January - highs near 24°F (-5°C)
- Decade extremes (2015-2024): 100°F (38°C) high · -32°F (-36°C) low
- Wettest month: June (8 rainy days) · Sunniest: July (13.5 h sun/day)
- Climate type: humid continental
- Annual swing: 32°C between the average warmest and coolest month · day to night: 10°C
- Snow: about 18 days a year
- Months with freezing average lows: 6
- Average humidity: 66%
Temperatures through the year
The wettest month is June (2.7 inches (70 mm) across 8 days) and the driest January. July is the warm end of the year, averaging 83°F (28°C) by day and 63°F (17°C) overnight. January is the coolest month, with highs of 24°F (-5°C) and lows near 8°F (-14°C). Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 100°F (38°C) and the lowest daily minimum -32°F (-36°C). Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June.
Rain, sun and snow
2 months average under 20 mm of rain, the longest unbroken stretch running January through February.
Season by season
Spring (March through May)
Spring in Bismarck runs cold, with daytime highs averaging 53°F (11°C) and nights around 32°F (0°C); expect showers on roughly 24 days across the season, plus about 5 snowy days.
Summer (June through August)
Summer in Bismarck brings hot afternoons, with daytime highs averaging 81°F (27°C) and nights around 60°F (16°C); expect showers on roughly 23 days across the season. Daylight is generous - around 12.8 hours of sun a day.
Fall (September through November)
Through fall, Bismarck runs cool rather than cold: 56°F (14°C) by day, 39°F (4°C) after dark, and rain comes on about 16 days over the three months, plus about 3 snowy days.
Winter (December through February)
Winter in Bismarck brings deep cold, with daytime highs averaging 26°F (-3°C) and nights around 9°F (-13°C); rain comes on about 14 days over the three months, plus about 9 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in Bismarck by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 24° | 8° | 4 | 0.5 in | 5.9 h/day | 78% |
| February | 27° | 8° | 4 | 0.6 in | 7.8 h/day | 69% |
| March | 40° | 20° | 6 | 0.9 in | 8.9 h/day | 68% |
| April | 51° | 31° | 8 | 1.9 in | 9.3 h/day | 62% |
| May | 67° | 45° | 10 | 2.6 in | 11.4 h/day | 61% |
| June | 78° | 57° | 8 | 2.7 in | 13.1 h/day | 60% |
| July | 83° | 63° | 8 | 2.1 in | 13.5 h/day | 62% |
| August | 81° | 60° | 6 | 2.4 in | 11.8 h/day | 63% |
| September | 73° | 53° | 7 | 2.0 in | 9.9 h/day | 63% |
| October | 56° | 38° | 5 | 1.5 in | 8.0 h/day | 64% |
| November | 40° | 24° | 4 | 0.8 in | 6.5 h/day | 70% |
| December | 27° | 12° | 6 | 1.0 in | 5.6 h/day | 75% |