Duluth, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duluth, a city in St. Louis County, Minnesota.
Tonight
54°F
Chance Rain Showers then Patchy Fog
A chance of rain showers before 8pm, then a slight chance of drizzle between 8pm and midnight, then patchy fog and a slight chance of drizzle. Cloudy. Low around 54, with temperatures rising to around 56 overnight. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Duluth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Chance Rain Showers then Patchy Fog | 5 to 10 mph NE | 28% |
| Saturday | 61°F | Patchy Fog then Mostly Cloudy | 5 to 10 mph NE | 17% |
| Saturday Night | 52°F | Mostly Cloudy | 5 mph NE | 2% |
| Sunday | 58°F | Partly Sunny | 10 to 15 mph NE | 0% |
| Sunday Night | 48°F | Mostly Cloudy | 5 to 15 mph E | 0% |
| Monday | 59°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 45°F | Partly Cloudy | 5 to 15 mph E | 0% |
| Tuesday | 59°F | Sunny | 5 to 15 mph E | 0% |
| Tuesday Night | 45°F | Mostly Clear | 0 to 15 mph E | 0% |
| Wednesday | 61°F | Sunny | 0 to 10 mph E | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 10 mph SE | 5% |
| Thursday | 65°F | Mostly Sunny | 0 to 5 mph SE | 10% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 68°F | Mostly Sunny | 0 to 5 mph NE | 4% |
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
4b
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 Sep 19, 2026.