Bismarck Weather in May
Bismarck in May averages 20°C (68°F) during the day and 6°C (43°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Bismarck in May
Historically, the month has about 12 days of rain, averaging 76 mm (3 in) in total. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Bismarck in May
The temperature in Bismarck in May is perfect. Daytime highs reach 20°C (68°F), with nights dropping to 6°C (43°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights fall to 6°C (43°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Bismarck in May
There are approximately 296 hours of sunshine this month, resulting in mostly clear days.If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August and September typically offer the best circumstances for Bismarck.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Bismarck's climate page.
Bismarck Temperature in May
Min Temperature
6°C (43°F)
Max Temperature
20°C (68°F)
Chance of Rain
40%
Precipitation
76 mm (3 in)
Rainy days
12 days
Humidity
60%
Sunshine
296 hours
Percentage Sunshine
64%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Bismarck typically rise from around 18°C (64°F) at the start of May to approximately 23°C (73°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 10°C (50°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Bismarck in May
Browse day-by-day weather records for Bismarck spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Bismarck historical weather extremes in May
The extremes listed below come from historical weather data collected in Bismarck from 1976 through 2026.
- The hottest May day on record in Bismarck reached 35°C (95°F) (May 11, 2025).
- Bismarck registered its coldest May night on May 3, 2005, with temperatures dropping to -8°C (18°F).
- The heaviest May precipitation occurred on May 30, 2007, when 46 mm (1.8 in) of precipitation fell.
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Bismarck in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Bismarck in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Bismarck's climate page.
Temperature Rainfall Sunshine Humidity
See the full Bismarck climate overview or explore weather in the United States of America.
