Bismarck, North Dakota Weather
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Climate of Bismarck: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Bismarck, with average daytime highs around 30°C. January is the coolest, when nights typically fall to about -15°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 45°C, so the seasons feel very different from each other.
The area receives about 500 mm of rain in a typical year. Rainfall is modest in every month; June is the wettest at about 93 mm. The driest stretch is January to February and November, with under 20 mm a month.
For outdoor plans and travel, May to September usually offer the most comfortable weather in Bismarck, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -5° | -15° | 14 mm | 87% |
| Feb | -4° | -14° | 13 mm | 81% |
| Mar | 5° | -7° | 24 mm | 71% |
| Apr | 13° | -1° | 38 mm | 62% |
| May | 20° | 6° | 77 mm | 61% |
| Jun | 25° | 13° | 93 mm | 62% |
| Jul | 30° | 16° | 64 mm | 56% |
| Aug | 28° | 14° | 57 mm | 56% |
| Sep | 23° | 9° | 49 mm | 59% |
| Oct | 12° | 1° | 37 mm | 67% |
| Nov | 4° | -5° | 14 mm | 74% |
| Dec | -4° | -12° | 20 mm | 85% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Bismarck. Values describe typical conditions, not a forecast.
About Bismarck weather
Bismarck lies in North Dakota's continental climate, among the most extreme in the contiguous US — about 304 km west of Fargo. Expect warm summers (June–August). Winter brings very cold winters (December–February) with sub-zero lows common. This page shows live, auto-refreshing weather for Bismarck: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Bismarck is about 304 km west of Fargo, in North Dakota.
Bismarck sees very cold winters (December–February) with sub-zero lows common.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Bismarck's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Bismarck, with average daytime highs of about 30°C and nights around 16°C.
The coldest nights come in January, when the average low is about -15°C and daytime highs reach around -5°C. Frost is possible on clear, calm nights.
Bismarck receives about 500 mm of rain in a typical year. June is the wettest month at roughly 93 mm; no month averages more than 100 mm.
May to September usually offer the most comfortable weather in Bismarck, with mild daytime temperatures and little rain.
In November Bismarck typically sees daytime highs near 4°C and lows near -5°C, with about 14 mm of rain over the month and average humidity around 74%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Bismarck updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Bismarck's day-to-day weather follows the broader pattern of North Dakota described above. See the hourly weather forecast or the air quality index for more detail.