May Weather in Duluth, United States

Last updated: June 24, 2025

In Duluth, United States, the average temperature in May hovers around 21°C (71°F). However, you can expect a range, with minimums dipping to 5°C (41°F) and peaks reaching up to 34°C (94°F). Be prepared for some rain, as the region experiences about 116 mm (4.6 in) of precipitation over 11 days. On top of that, the average humidity sits at a notably high 81%.

May Temperature in Duluth

In May in Duluth, the average temperature is 21°C (71°F). The maximum can reach 34°C (94°F), while the minimum can drop as low as 5°C (41°F). This makes it an ideal time for travelers to enjoy a range of outdoor activities, from warm days to cool evenings.

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

The chart illustrates May 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, May typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).

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

May Precipitation in Duluth

In Duluth in May, the precipitation amount is 116 mm (4.6 in) over the course of 11 days.

May Precipitation Trends in Duluth

The chart displays monthly precipitation patterns in Duluth, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Duluth, May typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Duluth

In Duluth in May, humidity is 81%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket that makes traveling feel both refreshing and slightly heavy, often leading to a sticky sensation that can quickly deplete your energy.

May Average Humidity in Duluth

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

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

May UV Index in Duluth

In Duluth in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Duluth.

Maximum UV Index Levels in Duluth for May

The chart shows the monthly maximum UV Index (UVI) for Duluth in May, 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 May, the maximum UV index in Duluth typically reaches 11, which falls under the extreme exposure category.

Data source: Duluth May 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 May 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 May’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 May’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