Hermantown, MN Weather & Growing Conditions
Overnight
57°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Chance Rain Showers | 15 mph NW | 25% |
| Tuesday | 73°F | Mostly Sunny | 10 to 15 mph NW | 8% |
| Tuesday Night | 52°F | Mostly Clear | 0 to 10 mph W | 0% |
| Wednesday | 76°F | Sunny | 5 to 10 mph SW | 0% |
| Wednesday Night | 56°F | Partly Cloudy | 5 to 10 mph SW | 3% |
| Thursday | 82°F | Sunny | 10 to 15 mph SW | 8% |
| Thursday Night | 62°F | Mostly Clear | 10 mph SW | 5% |
| Friday | 84°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 19% |
| Friday Night | 58°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph W | 30% |
| Saturday | 77°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NW | 21% |
| Saturday Night | 58°F | Chance Showers And Thunderstorms | 5 mph NW | 33% |
| Sunday | 76°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NW | 22% |
| Sunday Night | 58°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NW | 17% |
| Monday | 77°F | Slight Chance Rain Showers | 5 to 10 mph N | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hermantown, MN
Last spring frost
May 13
First fall frost
Oct 1
Growing season
140 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, Mn (0.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.