Heron Lake, MN Weather & Growing Conditions
Overnight
59°F
Areas Of Fog
Areas of fog and patchy drizzle. Cloudy, with a low around 59. North northeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Areas Of Fog | 5 mph NNE | 17% |
| Saturday | 65°F | Widespread Fog | 5 to 10 mph N | 23% |
| Saturday Night | 53°F | Patchy Fog | 10 mph NNE | 11% |
| Sunday | 66°F | Cloudy | 10 to 15 mph NE | 9% |
| Sunday Night | 49°F | Chance Rain Showers | 10 to 15 mph ENE | 30% |
| Monday | 61°F | Chance Rain Showers | 10 mph ENE | 30% |
| Monday Night | 44°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph E | 16% |
| Tuesday | 64°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Tuesday Night | 42°F | Mostly Clear | 0 to 5 mph SE | 1% |
| Wednesday | 66°F | Mostly Sunny | 0 to 10 mph SE | 3% |
| Wednesday Night | 48°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SSE | 18% |
| Thursday | 68°F | Slight Chance Rain Showers | 5 to 10 mph SSE | 18% |
| Thursday Night | 50°F | Partly Cloudy | 5 mph SSE | 9% |
| Friday | 71°F | Partly Sunny | 5 to 10 mph SSE | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Heron Lake, MN
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
162 days
Hardiness zone
5a
Explore more for Heron Lake, MN: full frost dates · planting calendar · Minnesota frost dates
Climate data from the nearest NOAA station, Windom, Mn (10.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.