Duluth, MN Weather & Growing Conditions
Today
73°F
Sunny
Sunny, with a high near 73. West wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 10 mph W | 0% |
| Tonight | 52°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Wednesday | 76°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 0 to 5 mph SW | 3% |
| Thursday | 82°F | Sunny | 5 to 15 mph SW | 12% |
| Thursday Night | 62°F | Mostly Clear | 5 to 10 mph SW | 5% |
| Friday | 83°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 19% |
| Friday Night | 59°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph W | 30% |
| Saturday | 77°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph NW | 23% |
| Saturday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 31% |
| Sunday | 76°F | Slight Chance Showers And Thunderstorms | 5 mph NW | 23% |
| Sunday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph NW | 19% |
| Monday | 76°F | Slight Chance Rain Showers | 5 mph N | 18% |
| Monday Night | 57°F | Slight Chance Rain Showers | 5 mph N | 18% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Duluth, MN
Last spring frost
May 21
First fall frost
Sep 27
Growing season
129 days
Hardiness zone
4b
Explore more for Duluth, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Island Lake 4E, Mn (9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.