August Weather in Duluth, United States

Last updated: June 24, 2025

In Duluth, United States, the average temperature in August is a comfortable 25°C (78°F). During this time, temperatures can vary, with a minimum of 16°C (62°F) and a maximum of 35°C (96°F). You can expect an average precipitation of 156 mm (6.1 in) over 16 days, along with a humidity level of 81%. Plan your activities accordingly to make the most of this vibrant month!

August Temperature in Duluth

In August, in Duluth, the average temperature is 25°C (78°F). Maximum can reach 35°C (96°F) and minimum can be as low as 16°C (62°F). This pleasant climate makes Duluth an ideal destination for travelers looking to enjoy outdoor activities and explore the local attractions.

August Weather in Duluth: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Duluth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Duluth, August typically has an average temperature of 25°C (78°F), with highs reaching up to 35°C (96°F) and lows dropping to around 16°C (62°F).

Data source: Temperature data for Duluth generated using information from the Copernicus Climate Change Service.

August Precipitation in Duluth

In Duluth in August, the precipitation amount is 156 mm (6.1 in) spread over 16 days.

August Precipitation Trends in Duluth

The chart displays monthly precipitation patterns in Duluth, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Duluth, August typically receives around 156 mm (6.1 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Duluth

In Duluth in August humidity is 81%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less comfortable and requiring frequent breaks to stay hydrated.

August Average Humidity in Duluth

This chart illustrates the average monthly humidity levels in Duluth, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Duluth is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Duluth

In Duluth in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Duluth.

Maximum UV Index Levels in Duluth for August

The chart shows the monthly maximum UV Index (UVI) for Duluth in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Duluth typically reaches 10, which falls under the very high exposure category.

Data source: Duluth August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How August Weather in Duluth Compares to Other Months

Weather in Duluth varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Duluth, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Duluth, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	112 mm (4.4 inches)	86%	moderate
February Weather	10°C (50°F)	160 mm (6.3 inches)	84%	high
March Weather	13°C (56°F)	142 mm (5.6 inches)	83%	very high
April Weather	16°C (62°F)	129 mm (5.1 inches)	81%	very high
May Weather	21°C (71°F)	116 mm (4.6 inches)	81%	extreme
June Weather	24°C (76°F)	134 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	118 mm (4.7 inches)	83%	extreme
August Weather	25°C (78°F)	156 mm (6.1 inches)	81%	very high
September Weather	23°C (74°F)	115 mm (4.5 inches)	82%	very high
October Weather	18°C (65°F)	140 mm (5.5 inches)	78%	very high
November Weather	11°C (52°F)	83 mm (3.3 inches)	86%	high
December Weather	9°C (48°F)	141 mm (5.5 inches)	89%	moderate