August weather forecastGrand Portage, MN
August
Weather in August
August in Grand Portage maintains the summer enthusiasm with sustained warmth and a slightly increased relative humidity. The earlier rise in temperature begins to show a downward trend moving towards autumn. Long daylight hours continue to favor outdoor activities and beach outings. The Wind speed fluctuates minimally, ensuring a comfortable atmosphere. Soothing sea temperatures still allow for a dip in the water marking summer's end.Temperature
The yearly peak temperatures occur in July and August, averaging a high-temperature of 70°F (21.1°C).Humidity
In August, the average relative humidity in Grand Portage is 77%.Rainfall
In Grand Portage, in August, it is raining for 11.4 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 115 rainfall days, and 18.19" (462mm) of precipitation is accumulated.Snowfall
In Grand Portage, snow does not fall in June through September.Ocean temperature
August is the month with the warmest seawater, with an average ocean temperature of 59°F (15°C).Note: For the majority, swimming in 59°F (15°C) does not offer a pleasant experience. Below 69.8°F (21°C), the difficulty in controlling breathing escalates.
Daylight
In Grand Portage, Minnesota, the average length of the day in August is 14h and 14min.On the first day of August, sunrise is at 5:36 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 7:41 pm CDT.
Sunshine
The average sunshine in August is 9.4h.UV index
In August, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: In August, an average UV index of 4 transforms into the following instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in August
Grand Portage, MN
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
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).
Average humidity in August
Grand Portage, MN
- Average humidity in August: 77%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).
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").
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).
Average snowfall in August
Grand Portage, MN
- Average snowfall in August: 0"
The month with the highest snowfall is January (7.76").
The months with the least snowfall are June, July, August and September (0").
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).
The months with the least snowfall days are June, July, August and September (0 days).
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).
Average daylight in August /
Average sunshine in August
Grand Portage, MN
- Average daylight in August: 14h and 12min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in August: 9h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
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).
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).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
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).
Average visibility in August
Grand Portage, MN
- Average visibility in August: 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).
