Heron Lake, MN Weather & Growing Conditions
Today
44°F
Rain Showers
Rain showers. Cloudy, with a high near 44. West northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 44°F | Rain Showers | 15 to 20 mph WNW | 76% |
| Tonight | 36°F | Rain Showers Likely | 15 mph NW | 73% |
| Thursday | 43°F | Mostly Cloudy | 15 mph NNW | 5% |
| Thursday Night | 30°F | Mostly Cloudy | 0 to 10 mph N | 0% |
| Friday | 43°F | Mostly Sunny | 0 mph | 0% |
| Friday Night | 28°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 50°F | Mostly Sunny | 0 to 10 mph SW | 1% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 0% |
| Sunday | 54°F | Sunny | 5 to 10 mph WSW | 0% |
| Sunday Night | 36°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Monday | 59°F | Sunny | 10 mph W | 0% |
| Monday Night | 37°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 56°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Tuesday Night | 38°F | Partly Cloudy | 0 to 5 mph SW | 0% |
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 Nov 4, 2026.