May weather forecast and climate
Portland, ND

The last month of the spring, May, is a comfortable month in Portland, North Dakota, with temperature in the range of an average low of 48.2°F (9°C) and an average high of 64.9°F (18.3°C).

Temperature

In May, the average high-temperature soars, from a fresh 50.2°F (10.1°C) in April, to a comfortable 64.9°F (18.3°C). The average low-temperature, in Portland, is 48.2°F (9°C).

Humidity

In Portland, the average relative humidity is 63%.

Rainfall

In Portland, during May, the rain falls for 14.3 days and regularly aggregates up to 2.28" (58mm) of precipitation. In Portland, during the entire year, the rain falls for 101.8 days and collects up to 18.23" (463mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Portland, North Dakota. During 0.6 snowfall days, Portland aggregates 0.63" (16mm) of snow. Throughout the year, there are 66.9 snowfall days, and 20.43" (519mm) of snow is accumulated.

Daylight

The average length of the day is 15.1h.

Sunshine

In May, the average sunshine in Portland is 8.7h.

UV index

In Portland, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Portland?

In Portland, in May, the average high-temperature is 64.9°F (18.3°C), and the average low-temperature is 48.2°F (9°C).

What is the average humidity in May in Portland?

In May, the average relative humidity in Portland is 63%.

How much does it rain in Portland in May?

In Portland, in May, during 14.3 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

What is the last month it snows in Portland?

May is the last month it regularly snows. During 0.6 snowfall days, in May, Portland aggregates 0.63" (16mm) of snow.

How many hours of daylight does Portland have in May?

The average length of the day in May in Portland, North Dakota, is 15.1h.

How many hours of sunshine does Portland have in May?

The average sunshine in May in Portland, North Dakota, is 8.7h.

What is the UV index intensity in May in Portland?

In May, the average daily maximum UV index in Portland, North Dakota, is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in May - Portland, ND
  • Average high temperature in May: 18.3°C

The warmest months (with the highest average high temperature) are July and August (26.9°C).
The month with the lowest average high temperature is January (-9.1°C).

  • Average low temperature in May: 9°C

The month with the highest average low temperature is July (15.7°C).
The coldest month (with the lowest average low temperature) is January (-16.8°C).

Average pressure in May - Portland, ND
  • Average pressure in May: 1013.8mbar

The month with the highest atmospheric pressure is February (1021.7mbar).
The month with the lowest atmospheric pressure is June (1011.1mbar).

Average wind speed in May - Portland, ND
  • Average wind speed in May: 15.9km/h

The windiest month (with the highest average wind speed) is October (17.6km/h).
The calmest month (with the lowest average wind speed) is July (13.3km/h).

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

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (61%).

Average rainfall in May - Portland, ND
  • Average rainfall in May: 58mm

The wettest month (with the highest rainfall) is June (89mm).
The driest months (with the least rainfall) are January and February (14mm).

Average rainfall days in May - Portland, ND
  • Average rainfall days in May: 14.3 days

The month with the highest number of rainy days is June (16.9 days).
The month with the least rainy days is February (1.9 days).

Average snowfall in May - Portland, ND
  • Average snowfall in May: 16mm

The month with the highest snowfall is December (108mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in May - Portland, ND
  • Average snowfall days in May: 0.6 days

The month with the highest number of snowfall days is December (14 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in May: 8.7h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 3.3h).

Average sunshine days in May - Portland, ND
  • Average sunshine days in May: 15.1 days

The month with the most sunshine days is September (20.4 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in May - Portland, ND
  • Average UV index in May: 4

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in May - Portland, ND
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 25).

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

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