August weather forecast and climate
Grand Portage, MN

Weather in August

August, the last month of the summer, in Grand Portage, is also an agreeable month, with average temperature fluctuating between 70°F (21.1°C) and 54.3°F (12.4°C).

Temperature

July and August, with an average high-temperature of 70°F (21.1°C), are the warmest months.

Humidity

In Grand Portage, the average relative humidity is 77%.

Rainfall

In Grand Portage, during 11.4 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Grand Portage, during the entire year, the rain falls for 115 days and collects up to 18.19" (462mm) of precipitation.

Snowfall

In Grand Portage snow does not fall in June through September.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 59°F (15°C).
Note: Swimming in 59°F (15°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in Grand Portage is 14.2h.

Sunshine

In August, the average sunshine is 9.4h.

UV index

The average daily maximum UV index in August is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 4 translate into the following recommendations:
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.
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FAQ

What is the warmest month in Grand Portage?

Warmest months in Grand Portage are July and August, with an average high-temperature of 70°F (21.1°C).

What is the average humidity in August in Grand Portage?

The average relative humidity in August in Grand Portage is 77%.

How much does it rain in Grand Portage in August?

In Grand Portage, Minnesota, in August, it is raining for 11.4 days, with typically 1.61" (41mm) of accumulated precipitation.

When it does not snow in Grand Portage?

In Grand Portage snow does not fall in June through September.

What is the month with the warmest ocean in Grand Portage?

August is the month with the warmest seawater in Grand Portage, with an average ocean temperature of 59°F (15°C).

How cold is the water in August in Grand Portage?

In August, the average ocean temperature in Grand Portage is 59°F (15°C). For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in August in Grand Portage?

The average length of the day in August in Grand Portage is 14.2h.

How long on average sun shines in August in Grand Portage?

The average sunshine in August in Grand Portage, Minnesota, is 9.4h.

How high is the UV index in August in Grand Portage?

The average daily maximum UV index in August in Grand Portage, Minnesota, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in August
Grand Portage, MN

Average temperature in August - Grand Portage, MN
  • Average high temperature in August: 70°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 August: 54.3°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 August
Grand Portage, MN

Average pressure in August - Grand Portage, MN
  • Average pressure in August: 29.91"

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 August
Grand Portage, MN

Average wind speed in August - Grand Portage, MN
  • Average wind speed in August: 6.6mph

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 August
Grand Portage, MN

Average humidity in August - Grand Portage, MN
  • Average humidity in August: 77%

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 August
Grand Portage, MN

Average rainfall in August - Grand Portage, MN
  • Average rainfall in August: 1.61"

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 August
Grand Portage, MN

Average rainfall days in August - Grand Portage, MN
  • Average rainfall days in August: 11.4 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 August
Grand Portage, MN

Average snowfall in August - Grand Portage, MN
  • Average snowfall in August: 0"

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

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Average snowfall days in August
Grand Portage, MN

Average snowfall days in August - Grand Portage, MN
  • Average snowfall days in August: 0 days

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

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Average sea temperature in August
Grand Portage, MN

Average sea temperature in August - Grand Portage, MN
  • Average sea temperature in August: 59°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 August /
Average sunshine in August
Grand Portage, MN

Average daylight in August / Average sunshine in August - Grand Portage, MN
  • Average daylight in August: 14.2h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in August: 9.4h

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 August
Grand Portage, MN

Average sunshine days in August - Grand Portage, MN
  • Average sunshine days in August: 18 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 August
Grand Portage, MN

Average UV index in August - Grand Portage, MN
  • Average UV index in August: 4

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

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Average cloud cover in August
Grand Portage, MN

Average cloud cover in August - Grand Portage, MN
  • Average cloud cover in August: 34

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 August
Grand Portage, MN

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

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

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