Hermantown, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hermantown, a city in St. Louis County, Minnesota.
Overnight
51°F
Patchy Fog
Patchy fog after 4am. Cloudy, with a low around 51. East wind 5 to 10 mph.
7-day forecast for Hermantown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Patchy Fog | 5 to 10 mph E | 13% |
| Saturday | 62°F | Patchy Fog then Cloudy | 5 to 10 mph E | 9% |
| Saturday Night | 49°F | Mostly Cloudy then Patchy Fog | 5 to 10 mph NE | 3% |
| Sunday | 59°F | Partly Sunny | 10 to 15 mph NE | 1% |
| Sunday Night | 42°F | Mostly Cloudy | 10 mph E | 0% |
| Monday | 58°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph E | 0% |
| Tuesday | 59°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 40°F | Mostly Clear | 0 to 10 mph E | 0% |
| Wednesday | 62°F | Sunny | 0 to 10 mph SE | 0% |
| Wednesday Night | 43°F | Mostly Clear | 0 to 10 mph E | 3% |
| Thursday | 64°F | Mostly Sunny | 0 to 10 mph SE | 5% |
| Thursday Night | 46°F | Partly Cloudy | 0 to 5 mph E | 5% |
| Friday | 67°F | Mostly Sunny | 0 to 10 mph SE | 4% |
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 Sep 19, 2026.