Duluth, MN Weather & Growing Conditions
Today
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. West wind around 10 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Mostly Sunny | 10 mph W | 1% |
| Tonight | 52°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 79°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Thursday | 86°F | Sunny | 5 to 15 mph SW | 6% |
| Thursday Night | 64°F | Mostly Clear | 5 to 10 mph SW | 5% |
| Friday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 18% |
| Friday Night | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 29% |
| Saturday | 81°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 19% |
| Saturday Night | 61°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph NW | 37% |
| Sunday | 79°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NW | 23% |
| Sunday Night | 59°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph NW | 18% |
| Monday | 78°F | Slight Chance Rain Showers | 0 to 5 mph N | 21% |
| Monday Night | 58°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 5 mph N | 19% |
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
4b
Explore more for Duluth, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Duluth Harbor Stn, Mn (4.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.