Hermantown, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hermantown, a city in St. Louis County, Minnesota.
This Afternoon
58°F
Rain
Patchy fog and a slight chance of rain before 2pm, then rain and patchy fog. Cloudy. High near 58, with temperatures falling to around 53 in the afternoon. North wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Hermantown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Rain | 10 mph N | 79% |
| Tonight | 49°F | Rain | 10 to 15 mph NE | 87% |
| Wednesday | 52°F | Rain | 10 to 15 mph NE | 93% |
| Wednesday Night | 40°F | Light Rain | 15 mph N | 83% |
| Thursday | 43°F | Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 34% |
| Thursday Night | 29°F | Mostly Cloudy | 5 to 10 mph NE | 0% |
| Friday | 39°F | Mostly Sunny | 5 mph E | 0% |
| Friday Night | 26°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Saturday | 46°F | Mostly Sunny | 0 to 10 mph SW | 1% |
| Saturday Night | 33°F | Partly Cloudy | 5 to 10 mph W | 13% |
| Sunday | 49°F | Mostly Sunny | 10 mph W | 10% |
| Sunday Night | 33°F | Partly Cloudy | 5 mph SW | 2% |
| Monday | 51°F | Mostly Sunny | 5 to 15 mph SW | 2% |
| Monday Night | 35°F | Partly Cloudy | 10 mph W | 0% |
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 Nov 3, 2026.