Heron Lake, MN Weather & Growing Conditions
Today
72°F
Scattered Rain Showers
Scattered rain showers after 11am. Mostly cloudy, with a high near 72. North northwest wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Scattered Rain Showers | 5 to 10 mph NNW | 49% |
| Tonight | 53°F | Scattered Rain Showers then Partly Cloudy | 0 to 5 mph WSW | 35% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph SSW | 0% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 81°F | Sunny | 5 to 15 mph SSW | 0% |
| Thursday Night | 62°F | Mostly Clear | 10 mph SSW | 3% |
| Friday | 85°F | Sunny | 10 to 15 mph SSW | 9% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 17% |
| Saturday | 86°F | Sunny | 5 to 15 mph SSW | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 10 to 15 mph SE | 27% |
| Sunday | 84°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 mph ESE | 27% |
| Sunday Night | 66°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph E | 30% |
| Monday | 83°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph ENE | 30% |
| Monday Night | 65°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph NE | 27% |
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 Aug 4, 2026.