Harman US

Duluth, MN Weather & Growing Conditions

Overnight
56°F
Patchy Fog
Patchy fog and a slight chance of rain showers before 4am, then patchy fog and a slight chance of drizzle. Cloudy. Low around 56, with temperatures rising to around 58 overnight. Northeast wind around 10 mph. Chance of precipitation is 20%.

7-day forecast

WhenTempForecastWindPrecip
Overnight 56°F Patchy Fog 10 mph NE 15%
Saturday 60°F Patchy Fog then Mostly Cloudy 10 to 15 mph NE 10%
Saturday Night 54°F Mostly Cloudy 5 to 10 mph NE 4%
Sunday 58°F Partly Sunny 15 to 25 mph NE 2%
Sunday Night 52°F Mostly Cloudy 15 to 20 mph E 0%
Monday 56°F Mostly Sunny 15 to 25 mph E 0%
Monday Night 47°F Partly Cloudy 5 to 20 mph E 0%
Tuesday 58°F Sunny 5 to 15 mph E 0%
Tuesday Night 47°F Mostly Clear 0 to 15 mph E 0%
Wednesday 61°F Sunny 0 to 15 mph E 0%
Wednesday Night 50°F Partly Cloudy 0 to 10 mph E 5%
Thursday 64°F Mostly Sunny 0 to 5 mph SE 10%
Thursday Night 53°F Partly Cloudy 0 to 5 mph NE 5%
Friday 67°F Mostly Sunny 5 to 10 mph NE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Duluth, MN

Last spring frost
May 14
First fall frost
Oct 12
Growing season
149 days
Hardiness zone
5a

Explore more for Duluth, MN: full frost dates · planting calendar · Minnesota frost dates

Climate data from the nearest NOAA station, Duluth Harbor Stn, Mn (0.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.