Hermantown, MN Weather & Growing Conditions
Tonight
50°F
Slight Chance Drizzle then Patchy Fog
A slight chance of drizzle before 10pm, then patchy fog. Mostly cloudy, with a low around 50. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Slight Chance Drizzle then Patchy Fog | 5 to 10 mph E | 16% |
| Saturday | 61°F | Patchy Fog then Mostly Cloudy | 5 to 10 mph E | 10% |
| Saturday Night | 48°F | Mostly Cloudy | 5 mph NE | 0% |
| Sunday | 59°F | Partly Sunny | 10 to 15 mph NE | 0% |
| Sunday Night | 43°F | Mostly Cloudy | 5 to 10 mph E | 0% |
| Monday | 57°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 41°F | Partly Cloudy | 5 to 10 mph E | 0% |
| Tuesday | 59°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 41°F | Mostly Clear | 5 to 10 mph E | 0% |
| Wednesday | 62°F | Sunny | 0 to 10 mph SE | 0% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 5 mph SE | 6% |
| Thursday | 65°F | Mostly Sunny | 0 to 5 mph S | 10% |
| Thursday Night | 47°F | Partly Cloudy | 0 to 5 mph E | 5% |
| Friday | 68°F | Mostly Sunny | 5 to 10 mph E | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hermantown, MN
Last spring frost
May 18
First fall frost
Oct 1
Growing season
135 days
Hardiness zone
4b
Explore more for Hermantown, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Duluth Nws, Mn (0.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.