August weather forecast
Duluth, MN

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The lit Aerial Lift Bridge and two long piers with lighthouses at the ends in Duluth, Minnesota
The lit Aerial Lift Bridge and two long piers with lighthouses at the ends in Duluth, Minnesota

Weather in August

August in Duluth holds onto the summer weather, even though the temperatures show a slight decline from the previous month. The month signals the end of the warmest time of the year, preparing for a transition toward the cooler autumn temperatures. Mirroring July's pattern, the city maintains lengthy daylight periods, contributes to the continuity of outdoor activities. Despite dwindling temperatures, the sea remains suitably warm throughout the month. Signifying the onset of autumn, August average high temperature drops slightly to 75.7°F (24.3°C).

Temperature

The introduction of August notes a subtle temperature variation to a still moderately hot 75.7°F (24.3°C) from July's 77.4°F (25.2°C). Duluth, in the month of August, anticipates a consistent average low-temperature of 56.5°F (13.6°C).

Humidity

The average relative humidity in August is 76%.

Rainfall

In Duluth, during August, the rain falls for 14.7 days and regularly aggregates up to 2.44" (62mm) of precipitation. Throughout the year, there are 135.2 rainfall days, and 24.53" (623mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Duluth, Minnesota.

Ocean temperature

August is the month with the warmest seawater, with an average ocean temperature of 60.8°F (16°C).
Note: For the majority, swimming in water with a temperature of 60.8°F (16°C) is not enjoyable. The difficulty in managing breathing rises as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In August, the average length of the day in Duluth, Minnesota, is 14h and 9min.
On the first day of the month, sunrise is at 5:49 am and sunset at 8:39 pm. On the last day of August, in Duluth, sunrise is at 6:27 am and sunset at 7:49 pm CDT.

Sunshine

In August, the average sunshine in Duluth is 9.6h.

UV index

In Duluth, the average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 5 during August translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are August temperatures in Duluth?

In August, the average high-temperature and low-temperature are 75.7°F (24.3°C) and 56.5°F (13.6°C) respectively.

What is the average humidity in August in Duluth?

In Duluth, the average relative humidity in August is 76%.

How many days does it rain in August in Duluth?

In August, in Duluth, Minnesota, the rain falls for 14.7 days. Throughout August, 2.44" (62mm) of precipitation is accumulated.

When it does not snow in Duluth?

In Duluth, Minnesota, snow does not fall in June through September.

What is the month with the warmest ocean in Duluth?

The month with the warmest seawater in Duluth, Minnesota, is August, with an average ocean temperature of 60.8°F (16°C).

What is the ocean temperature in August in Duluth?

In August, the average ocean temperature in Duluth is 60.8°F (16°C). Swimming in 60.8°F (16°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Duluth have in August?

In Duluth, the average day length in August is 14h and 9min.

When are sunrise and sunset in August in Duluth?

In August, on the first day of the month, sunrise is at 5:49 am and sunset at 8:39 pm. On the last day of the month, in Duluth, sunrise is at 6:27 am and sunset at 7:49 pm CDT.

How long on average sun shines in August in Duluth?

The average sunshine duration in August in Duluth is 9.6h.

How high is the UV index in August in Duluth?

In August, the average daily maximum UV index in Duluth, Minnesota, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Duluth, MN

Average temperature in August - Duluth, MN
  • Average high temperature in August: 75.7°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (16.3°F).

  • Average low temperature in August: 56.5°F

The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (3.9°F).

Average pressure in August
Duluth, MN

Average pressure in August - Duluth, MN
  • Average pressure in August: 29.93"Hg

The month with the highest atmospheric pressure is February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in August
Duluth, MN

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

The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

Average humidity in August
Duluth, MN

Average humidity in August - Duluth, MN
  • Average humidity in August: 76%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).

Average rainfall in August
Duluth, MN

Average rainfall in August - Duluth, MN
  • Average rainfall in August: 2.44"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is January (0.87").

Average rainfall days in August
Duluth, MN

Average rainfall days in August - Duluth, MN
  • Average rainfall days in August: 14.7 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.3 days).

Average snowfall in August
Duluth, MN

Average snowfall in August - Duluth, MN
  • Average snowfall in August: 0"

The month with the highest snowfall is December (7.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Duluth, MN

Average snowfall days in August - Duluth, MN
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (20.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in August
Duluth, MN

Average sea temperature in August - Duluth, MN
  • Average sea temperature in August: 61°F

The best month for swimming (with the highest average sea temperature) is August (61°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
Duluth, MN

Average daylight in August / Average sunshine in August - Duluth, MN
  • Average daylight in August: 14h and 1min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in August: 9h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days in August
Duluth, MN

Average sunshine days in August - Duluth, MN
  • Average sunshine days in August: 13 days

The month with the most sunshine days is November (13.7 days).
The month with the least sunshine days is June (10.1 days).

Average UV index in August
Duluth, MN

Average UV index in August - Duluth, MN
  • Average UV index in August: 5

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

Average cloud cover in August
Duluth, MN

Average cloud cover in August - Duluth, MN
  • Average cloud cover in August: 35

The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in August
Duluth, MN

Average visibility in August - Duluth, MN
  • Average visibility in August: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Duluth, Minnesota, USA

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