Hermantown, MN Weather & Growing Conditions
Overnight
49°F
Light Rain
Rain and patchy fog. Cloudy, with a low around 49. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Light Rain | 15 mph NE | 88% |
| Wednesday | 52°F | Rain | 10 to 15 mph NE | 92% |
| Wednesday Night | 39°F | Light Rain | 10 to 15 mph N | 88% |
| Thursday | 42°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 21% |
| Thursday Night | 26°F | Mostly Cloudy | 5 to 10 mph NE | 1% |
| Friday | 38°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Friday Night | 24°F | Mostly Clear | 0 to 5 mph S | 0% |
| Saturday | 43°F | Mostly Sunny | 5 to 10 mph SW | 2% |
| Saturday Night | 31°F | Partly Cloudy | 10 mph W | 7% |
| Sunday | 47°F | Mostly Sunny | 10 mph W | 3% |
| Sunday Night | 32°F | Partly Cloudy | 5 mph SW | 0% |
| Monday | 52°F | Partly Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 34°F | Partly Cloudy | 10 mph W | 1% |
| Tuesday | 47°F | Mostly Sunny | 5 to 10 mph NW | 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 (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.