Duluth, MN Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Duluth, a city in St. Louis County, Minnesota.

This Afternoon

53°F

Light Rain Likely

Rain likely and patchy fog. Cloudy, with a high near 53. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Duluth

When	Temp	Forecast	Wind	Precip
This Afternoon	53°F	Light Rain Likely	10 mph N	64%
Tonight	39°F	Light Rain	10 to 15 mph N	86%
Thursday	43°F	Slight Chance Light Rain then Mostly Cloudy	10 to 15 mph N	16%
Thursday Night	29°F	Mostly Cloudy	5 to 10 mph N	1%
Friday	40°F	Sunny	0 to 5 mph E	0%
Friday Night	27°F	Partly Cloudy	0 to 5 mph SW	0%
Saturday	45°F	Mostly Sunny	5 to 10 mph SW	0%
Saturday Night	36°F	Partly Cloudy	10 mph W	2%
Sunday	50°F	Sunny	5 to 10 mph W	1%
Sunday Night	36°F	Partly Cloudy	5 mph SW	0%
Monday	55°F	Mostly Sunny	5 to 15 mph SW	0%
Monday Night	38°F	Mostly Clear	10 mph W	1%
Tuesday	49°F	Mostly Sunny	5 to 10 mph W	2%
Tuesday Night	35°F	Partly Cloudy	5 mph NW	1%

Forecast source: National Weather Service (api.weather.gov) for Duluth (46.774, -92.134). Updated through the day.

Growing snapshot for Duluth

Last spring frost

May 14

First fall frost

Oct 12

Growing season

149 days

Hardiness zone

More local growing data for Duluth: nearby ZIP 55806 weather · frost dates · planting calendar · Minnesota frost dates

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Climate data from the nearest NOAA station, Duluth Harbor Stn, Mn (1.8 mi from Duluth). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.