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

85°F

Mostly Cloudy

Mostly cloudy. High near 85, with temperatures falling to around 81 in the afternoon. Southwest wind around 5 mph.

7-day forecast for La Harpe

When	Temp	Forecast	Wind	Precip
This Afternoon	85°F	Mostly Cloudy	5 mph SW	9%
Tonight	68°F	Chance Showers And Thunderstorms	5 mph E	60%
Sunday	75°F	Showers And Thunderstorms Likely then Chance Showers And Thunderstorms	5 to 15 mph N	64%
Sunday Night	59°F	Chance Showers And Thunderstorms then Showers And Thunderstorms Likely	10 to 15 mph NE	68%
Monday	65°F	Showers And Thunderstorms	10 to 15 mph NE	79%
Monday Night	55°F	Rain Showers Likely	10 mph NE	71%
Tuesday	63°F	Chance Rain Showers	10 mph NE	44%
Tuesday Night	50°F	Mostly Cloudy	5 to 10 mph NE	4%
Wednesday	66°F	Partly Sunny	5 to 10 mph NE	1%
Wednesday Night	53°F	Partly Cloudy	0 to 5 mph NE	1%
Thursday	69°F	Partly Sunny	0 to 5 mph NE	3%
Thursday Night	57°F	Slight Chance Rain Showers	0 to 5 mph NE	15%
Friday	74°F	Slight Chance Rain Showers	0 to 5 mph NE	15%
Friday Night	57°F	Partly Cloudy	0 to 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

More local growing data for La Harpe: nearby ZIP 61450 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Augusta Basco Bentley Bowen Carthage Dallas City Elvaston Ferris Hamilton Nauvoo Niota Plymouth Pontoosuc West Point

All Illinois locations ›

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 20, 2026.