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
59°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly cloudy. High near 59, with temperatures falling to around 55 in the afternoon. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
7-day forecast for Hermantown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Slight Chance Rain Showers | 10 mph E | 18% |
| Tonight | 50°F | Chance Rain Showers then Chance Drizzle | 5 to 10 mph E | 30% |
| Saturday | 61°F | Patchy Fog then Mostly Cloudy | 10 mph E | 20% |
| Saturday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 2% |
| Sunday | 59°F | Partly Sunny | 10 to 15 mph NE | 0% |
| Sunday Night | 43°F | Mostly Cloudy | 10 to 15 mph E | 0% |
| Monday | 57°F | Mostly Sunny | 5 to 15 mph E | 0% |
| Monday Night | 41°F | Partly Cloudy | 5 to 15 mph E | 0% |
| Tuesday | 59°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 41°F | Mostly Clear | 0 to 10 mph E | 0% |
| Wednesday | 62°F | Sunny | 0 to 10 mph SE | 0% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 10 mph SE | 6% |
| Thursday | 65°F | Mostly Sunny | 0 to 5 mph S | 10% |
| Thursday Night | 47°F | Partly Cloudy | 0 to 5 mph E | 5% |
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.