Climate

Duluth weather by month

Average highs, lows, rain and snow for every month, from 30 years of weather records.

Average temperatures

Best time to visit: July, August, September, when highs are mild and rain is lightest.

Month	High	Low	Rain	Snow	Wet days
January	20°F	2°F	0.90 in	16.8 in	10
February	25°F	6°F	1.0 in	15.1 in	9
March	36°F	18°F	1.5 in	12.8 in	10
April	49°F	30°F	2.5 in	9.1 in	11
May	63°F	41°F	3.4 in	0.80 in	13
June	72°F	50°F	4.4 in	0.00 in	12
July	78°F	56°F	3.9 in	0.00 in	12
August	76°F	55°F	3.7 in	0.00 in	11
September	67°F	47°F	3.5 in	0.10 in	12
October	53°F	36°F	2.9 in	2.7 in	12
November	37°F	23°F	2.0 in	14.1 in	11
December	25°F	10°F	1.5 in	18.7 in	11

NOAA U.S. Climate Normals 1991–2020, Duluth, Mn Us (5.6 mi away, 1,428 ft). Wet days: days with at least 0.01 in of precipitation.

What is the hottest month in Duluth?

July, with an average high of 78°F and low of 56°F.

What is the coldest month in Duluth?

January, with an average low of 2°F and high of 20°F.

When does it rain most in Duluth?

June is the wettest month, averaging 4.4 in of precipitation; the year totals about 31.2 inches.

Does it snow in Duluth?

Yes. Snowfall averages about 90 inches a year, mostly in December and January.

What is the best time to visit Duluth?

For mild weather (highs between 65°F and 85°F) with the least rain, July, August, September.

Where do these numbers come from?

NOAA’s 1991–2020 U.S. Climate Normals for the Duluth weather station, 5.6 miles from downtown: 30-year averages, not a forecast.