May weather forecast
Grand Portage, MN

Weather in May

The last month of the spring, May, is a fresh month in Grand Portage, Minnesota, with an average temperature ranging between max 54.3°F (12.4°C) and min 39°F (3.9°C).

Temperature

In May, the average high-temperature rises from a cold 40.5°F (4.7°C) in April to a fresh 54.3°F (12.4°C). The average low-temperature, in May, is 39°F (3.9°C).

Humidity

The least humid month is May, with an average relative humidity of 70%.

Rainfall

The months with the most rainfall are May and October, with an average 1.77" (45mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Grand Portage. During 1.1 snowfall days, Grand Portage aggregates 0.35" (9mm) of snow. In Grand Portage, during the entire year, snow falls for 104.1 days and aggregates up to 39.84" (1012mm) of snow.

Ocean temperature

In May, the average ocean temperature is 37.4°F (3°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

The average length of the day in May is 15h and 12min.
On the first day of the month, sunrise is at 5:39 am and sunset at 8:11 pm. On the last day of May, sunrise is at 5:03 am and sunset at 8:49 pm CDT.

Sunshine

In May, the average sunshine in Grand Portage is 8.8h.

UV index

In Grand Portage, the average daily maximum UV index in May is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the 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.
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FAQ

What is the least humid month in Grand Portage?

May is the least humid month in Grand Portage, Minnesota, with an average relative humidity of 70%.

What is the average humidity in May in Grand Portage?

In May, the average relative humidity in Grand Portage, Minnesota, is 70%.

What is the wettest month in Grand Portage?

The wettest months are May and October, with an average 1.77" (45mm) of rainfall.

How much does it rain in Grand Portage in May?

In Grand Portage, in May, during 12.5 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

What is the last month it snows in Grand Portage?

May is the last month it regularly snows. During 1.1 snowfall days, in May, Grand Portage aggregates 0.35" (9mm) of snow.

What is the ocean temperature in May in Grand Portage?

In May, the average ocean temperature in Grand Portage, Minnesota, is 37.4°F (3°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

How many hours of daylight does Grand Portage have in May?

In Grand Portage, Minnesota, the average day length in May is 15h and 12min.

What time are sunrise and sunset in May in Grand Portage?

On the first day of May in Grand Portage, Minnesota, sunrise is at 5:39 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 5:03 am and sunset at 8:49 pm CDT.

How many hours of sunshine does Grand Portage have in May?

In Grand Portage, the average sunshine duration in May is 8.8h.

What is the UV index reading in May in Grand Portage?

In Grand Portage, the average daily maximum UV index in May is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.

Average temperature in May
Grand Portage, MN

Average temperature in May - Grand Portage, MN
  • Average high temperature in May: 54.3°F

The warmest months (with the highest average high temperature) are July and August (70°F).
The month with the lowest average high temperature is January (16.2°F).

  • Average low temperature in May: 39°F

The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is January (3.7°F).

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Average pressure in May
Grand Portage, MN

Average pressure in May - Grand Portage, MN
  • Average pressure in May: 29.97"

The month with the highest atmospheric pressure is March (30.09").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in May
Grand Portage, MN

Average wind speed in May - Grand Portage, MN
  • Average wind speed in May: 6.9mph

The windiest month (with the highest average wind speed) is December (9.2mph).
The calmest month (with the lowest average wind speed) is June (6.2mph).

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Average humidity in May
Grand Portage, MN

Average humidity in May - Grand Portage, MN
  • Average humidity in May: 70%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).

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Average rainfall in May
Grand Portage, MN

Average rainfall in May - Grand Portage, MN
  • Average rainfall in May: 1.77"

The wettest months (with the highest rainfall) are May and October (1.77").
The driest months (with the least rainfall) are January and February (1.06").

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Average rainfall days in May
Grand Portage, MN

Average rainfall days in May - Grand Portage, MN
  • Average rainfall days in May: 12.5 days

The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in May
Grand Portage, MN

Average snowfall in May - Grand Portage, MN
  • Average snowfall in May: 0.35"

The month with the highest snowfall is January (7.76").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Grand Portage, MN

Average snowfall days in May - Grand Portage, MN
  • Average snowfall days in May: 1.1 days

The month with the highest number of snowfall days is January (21.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in May
Grand Portage, MN

Average sea temperature in May - Grand Portage, MN
  • Average sea temperature in May: 37°F

The best month for swimming (with the highest average sea temperature) is August (59°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

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Average daylight in May /
Average sunshine in May
Grand Portage, MN

Average daylight in May / Average sunshine in May - Grand Portage, MN
  • Average daylight in May: 15h and 12min

The month with the longest days is June (Average daylight: 15h and 58min).
The month with the shortest days is December (Average daylight: 8h and 28min).

  • Average sunshine in May: 8.8h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days in May
Grand Portage, MN

Average sunshine days in May - Grand Portage, MN
  • Average sunshine days in May: 16.6 days

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is March (9.8 days).

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Average UV index in May
Grand Portage, MN

Average UV index in May - Grand Portage, MN
  • Average UV index in May: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).

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Average cloud cover in May
Grand Portage, MN

Average cloud cover in May - Grand Portage, MN
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 33).

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Average visibility in May
Grand Portage, MN

Average visibility in May - Grand Portage, MN
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).

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