Hermantown, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hermantown, a city in St. Louis County, Minnesota.
Today
72°F
Mostly Sunny
Mostly sunny, with a high near 72. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Hermantown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Mostly Sunny | 10 to 15 mph NW | 1% |
| Tonight | 51°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 | 2% |
| Thursday | 82°F | Sunny | 10 to 15 mph SW | 7% |
| Thursday Night | 61°F | Mostly Clear | 10 mph SW | 5% |
| Friday | 83°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 19% |
| Friday Night | 58°F | 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 | 34% |
| Sunday | 76°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph NW | 22% |
| Sunday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph N | 17% |
| Monday | 76°F | Slight Chance Rain Showers | 5 to 10 mph N | 20% |
| Monday Night | 56°F | Slight Chance Rain Showers | 5 mph N | 20% |
Forecast source: National Weather Service (api.weather.gov) for Hermantown (46.802, -92.241). Updated through the day.
Growing snapshot for Hermantown
Last spring frost
May 18
First fall frost
Oct 1
Growing season
135 days
Hardiness zone
4b
More local growing data for Hermantown: nearby ZIP 55811 weather · frost dates · planting calendar · Minnesota frost dates
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Climate data from the nearest NOAA station, Duluth Nws, Mn (0.6 mi from Hermantown). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.