Duluth, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duluth, a city in St. Louis County, Minnesota.
Today
52°F
Rain
Rain and areas of fog. Cloudy, with a high near 52. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Duluth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Rain | 10 to 15 mph N | 89% |
| Tonight | 41°F | Light Rain | 10 to 15 mph N | 90% |
| Thursday | 44°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 24% |
| Thursday Night | 30°F | Mostly Cloudy | 5 to 10 mph N | 1% |
| Friday | 39°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Friday Night | 27°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Saturday | 44°F | Mostly Sunny | 5 to 10 mph SW | 2% |
| Saturday Night | 35°F | Partly Cloudy | 10 mph W | 8% |
| Sunday | 48°F | Mostly Sunny | 10 to 15 mph W | 3% |
| Sunday Night | 35°F | Partly Cloudy | 5 mph SW | 0% |
| Monday | 52°F | Partly Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 37°F | Partly Cloudy | 10 mph W | 1% |
| Tuesday | 48°F | Mostly Sunny | 5 to 10 mph NW | 4% |
| Tuesday Night | 35°F | Partly Cloudy | 0 to 5 mph W | 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 Nov 4, 2026.