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August Weather in Bismarck, United States

Last updated: June 24, 2025

In August, the average temperature in Bismarck, United States is a pleasant 21°C (70°F). You may experience a minimum of 7°C (45°F) and a peak of 37°C (99°F), making it a month of diverse weather. With an average humidity of 78%, you can expect some stickiness in the air. Expect about 59 mm (2.3 in) of rain spread over 7 days, adding a refreshing twist to your days.

August Temperature in Bismarck

In August in Bismarck, the average temperature is 21°C (70°F). Maximums can reach 37°C (99°F), while minimums can drop as low as 7°C (45°F). This makes Bismarck a great destination for travelers looking for mild weather and the possibility of warm days.

August Weather in Bismarck: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Bismarck, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bismarck, August typically has an average temperature of 21°C (70°F), with highs reaching up to 37°C (99°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec151330405669737061443122
Data source: Temperature data for Bismarck generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Bismarck

In Bismarck in August, the precipitation amount is 59 mm (2.3 in) over a span of 7 days.

August Precipitation Trends in Bismarck

The chart displays monthly precipitation patterns in Bismarck, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Bismarck, August typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec131626264764655958561522
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Bismarck

In Bismarck in August, humidity is 78%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

August Average Humidity in Bismarck

This chart illustrates the average monthly humidity levels in Bismarck, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Bismarck is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%88%78%75%76%79%78%78%69%71%82%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Bismarck

In Bismarck in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Bismarck.

Maximum UV Index Levels in Bismarck for August

The chart shows the monthly maximum UV Index (UVI) for Bismarck in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Bismarck typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2459910997532
Data source: Bismarck August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Bismarck Compares to Other Months

Weather in Bismarck varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Bismarck, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Bismarck, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)12 mm (0.5 inches)84%low
February Weather-11°C (13°F)16 mm (0.6 inches)88%moderate
March Weather-1°C (30°F)26 mm (1.0 inches)78%moderate
April Weather4°C (40°F)26 mm (1.0 inches)75%very high
May Weather13°C (56°F)47 mm (1.9 inches)76%very high
June Weather21°C (69°F)64 mm (2.5 inches)79%very high
July Weather23°C (74°F)65 mm (2.6 inches)78%very high
August Weather21°C (70°F)59 mm (2.3 inches)78%very high
September Weather16°C (61°F)58 mm (2.3 inches)69%high
October Weather7°C (44°F)56 mm (2.2 inches)71%moderate
November Weather-1°C (31°F)15 mm (0.6 inches)82%moderate
December Weather-6°C (22°F)22 mm (0.9 inches)84%low

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