May weather forecast and climate
Bismarck, ND

An across the park view of the historical building of the State Capitol in Bismarck, North Dakota
An across the park view of the historical building of the State Capitol in Bismarck, North Dakota
May, the last month of the spring, in Bismarck, is an enjoyable month, with temperature in the range of an average low of 46.4°F (8°C) and an average high of 64.9°F (18.3°C).

Temperature

In May, the average high-temperature increases, from a cool 51.8°F (11°C) in April, to a comfortable 64.9°F (18.3°C). In May, the average low-temperature is 46.4°F (8°C).

Humidity

In Bismarck, North Dakota, the average relative humidity in May is 63%.

Rainfall

In May, the rain falls for 15.5 days. Throughout May, 2.17" (55mm) of precipitation is accumulated. In Bismarck, during the entire year, the rain falls for 105.9 days and collects up to 15" (381mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Bismarck. During 0.4 snowfall days, Bismarck aggregates 0.2" (5mm) of snow. In Bismarck, during the entire year, snow falls for 73.7 days, and aggregates up to 23.11" (587mm) of snow.

Daylight

In Bismarck, the average length of the day is 15.1h.

Sunshine

In Bismarck, North Dakota, the average sunshine is 9.5h.

UV index

The average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Bismarck?

The average high-temperature, in May, in Bismarck, North Dakota, is 64.9°F (18.3°C), while the average low-temperature is 46.4°F (8°C).

What is the average humidity in May in Bismarck?

The average relative humidity in May is 63%.

How many days does it rain in May in Bismarck?

In Bismarck, during May, the rain falls for 15.5 days and regularly aggregates up to 2.17" (55mm) of precipitation.

What is the last month it snows in Bismarck?

May is the last month it regularly snows. During 0.4 snowfall days, in May, Bismarck aggregates 0.2" (5mm) of snow.

How many hours of daylight does Bismarck have in May?

The average length of the day in May in Bismarck is 15.1h.

How many hours of sunshine does Bismarck have in May?

The average sunshine in May in Bismarck, North Dakota, is 9.5h.

What is the UV index intensity in May in Bismarck?

In May, the average daily maximum UV index in Bismarck, North Dakota, is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Bismarck, ND
  • Average high temperature in May: 18.3°C

The warmest month (with the highest average high temperature) is July (28.7°C).
The month with the lowest average high temperature is January (-6.2°C).

  • Average low temperature in May: 8°C

The month with the highest average low temperature is July (16.3°C).
The coldest month (with the lowest average low temperature) is January (-14.4°C).

Average pressure in May - Bismarck, ND
  • Average pressure in May: 1013.3mbar

The month with the highest atmospheric pressure is February (1021.7mbar).
The month with the lowest atmospheric pressure is June (1010.7mbar).

Average wind speed in May - Bismarck, ND
  • Average wind speed in May: 16.1km/h

The windiest month (with the highest average wind speed) is April (17.2km/h).
The calmest month (with the lowest average wind speed) is August (13.4km/h).

Average humidity in May - Bismarck, ND
  • Average humidity in May: 63%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (55%).

Average rainfall in May - Bismarck, ND
  • Average rainfall in May: 55mm

The wettest month (with the highest rainfall) is June (58mm).
The driest month (with the least rainfall) is January (15mm).

Average rainfall days in May - Bismarck, ND
  • Average rainfall days in May: 15.5 days

The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is February (3.4 days).

Average snowfall in May - Bismarck, ND
  • Average snowfall in May: 5mm

The month with the highest snowfall is February (110mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in May - Bismarck, ND
  • Average snowfall days in May: 0.4 days

The month with the highest number of snowfall days is December (15.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Bismarck, ND
  • Average daylight in May: 15.1h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in May: 9.5h

The month with the most sunshine is July (Average sunshine: 11.4h).
The month with the least sunshine is January (Average sunshine: 3.8h).

Average sunshine days in May - Bismarck, ND
  • Average sunshine days in May: 12.8 days

The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is March (12.3 days).

Average UV index in May - Bismarck, ND
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in May - Bismarck, ND
  • Average cloud cover in May: 38

The month with the most cloud cover is February (Cloud cover 60).
Months with the least cloud cover are July and August (Cloud cover 21).

Average visibility in May - Bismarck, ND
  • Average visibility in May: 10km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March and December (8km).