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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.