Temperature
Cold by day, freezing at night.
Bismarck is usually most comfortable in May and September. Typical daytime highs range from 22–83°F across the year. Most months see little rain.

Cold by day, freezing at night.
Some precipitation is expected this month.
A mix of sunshine and cloud.
Humidity is rarely noticeable in the cool air.
In November, afternoons feel about 25° and nights feel near 15°.
Mostly cloudy skies this month.
Breezy November days can feel brisker in open spots.
November late afternoons are around 34°F, easing to about 30°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 22 | 6 | 0.6 | 4 | 6.3 | 78 |
| Feb | 27 | 10 | 0.7 | 4 | 7.6 | 75 |
| Mar | 40 | 21 | 1.0 | 5 | 8.9 | 73 |
| Apr | 55 | 32 | 1.8 | 8 | 9.8 | 65 |
| May | 68 | 45 | 2.9 | 10 | 10.9 | 63 |
| Jun | 77 | 56 | 3.7 | 11 | 12.2 | 67 |
| Jul | 83 | 61 | 3.1 | 10 | 13.1 | 68 |
| Aug | 83 | 58 | 2.3 | 7 | 12.0 | 67 |
| Sep | 73 | 49 | 1.8 | 7 | 9.8 | 65 |
| Oct | 57 | 36 | 1.8 | 6 | 7.8 | 68 |
| Nov | 40 | 23 | 0.8 | 4 | 6.4 | 75 |
| Dec | 27 | 12 | 0.7 | 5 | 5.7 | 78 |
Similar climates
Want a side-by-side climate view? Compare Bismarck with New York City.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 27, 2026
Data & methodology