La Harpe, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for La Harpe, a city in Hancock County, Illinois.
This Afternoon
87°F
Mostly Cloudy
Mostly cloudy, with a high near 87. South wind around 10 mph.
7-day forecast for La Harpe
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Mostly Cloudy | 10 mph S | 8% |
| Tonight | 67°F | Chance Showers And Thunderstorms | 5 mph W | 69% |
| Sunday | 75°F | Showers And Thunderstorms | 5 to 15 mph N | 80% |
| Sunday Night | 59°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 68% |
| Monday | 65°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 68% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 45% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 67°F | Mostly Sunny | 5 to 10 mph NE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 70°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 55°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 4% |
| Friday Night | 55°F | Partly Cloudy | 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for La Harpe (40.585, -90.970). Updated through the day.
Growing snapshot for La Harpe
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
6a
More local growing data for La Harpe: nearby ZIP 61450 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, La Harpe, Il (1.2 mi from La Harpe). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.