Bismarck Climate by Month
Bismarck, North Dakota, United States
Warm summers and bitterly cold winters, with most rain from May to September.
Warm summers and bitterly cold winters, with most rain from May to September: that's Bismarck's climate in short. July is the warmest month, with highs around 85°F (30°C); January is the coolest at 22°F (-5°C), and nights dip to 2°F (-17°C). Of the 18 in (467 mm) of rain in a typical year, 70% falls from May to September.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 2°F(-17°C)
- Average low, January
- Rain per year
- 18 in(467 mm)
- Wettest: June
- Humidity
- 69%
- Sunniest: July
Best and worst months in Bismarck
Best for weatherThe most comfortable weather comes in September, with highs around 74°F (23°C) and about 1.6 in (41 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 22°F (-5°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Bismarck weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 22°F(-5°C) | 2°F(-17°C) | 0.4 in(10 mm) | 76% | 1.4 |
| FebFebruary | 27°F(-3°C) | 6°F(-14°C) | 0.4 in(11 mm) | 94% | 2.3 |
| MarMarch | 40°F(4°C) | 19°F(-7°C) | 0.7 in(18 mm) | 74% | 3.7 |
| AprApril | 55°F(13°C) | 31°F(-1°C) | 1.5 in(38 mm) | 64% | 4.7 |
| MayMay | 69°F(20°C) | 43°F(6°C) | 2.5 in(64 mm) | 59% | 5.6 |
| JunJune | 79°F(26°C) | 54°F(12°C) | 3.3 in(83 mm) | 63% | 5.9 |
| JulJuly | 85°F(30°C) | 59°F(15°C) | 3.2 in(82 mm) | 63% | 6.4 |
| AugAugust | 83°F(29°C) | 56°F(14°C) | 2.3 in(59 mm) | 60% | 5.5 |
| SepSeptemberBest | 74°F(23°C) | 47°F(8°C) | 1.6 in(41 mm) | 62% | 4.1 |
| OctOctober | 58°F(14°C) | 33°F(1°C) | 1.4 in(35 mm) | 57% | 2.5 |
| NovNovember | 41°F(5°C) | 20°F(-7°C) | 0.6 in(15 mm) | 70% | 1.5 |
| DecDecember | 27°F(-3°C) | 8°F(-13°C) | 0.4 in(11 mm) | 91% | 1.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
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