Harman US

Andover, IL Weather & Growing Conditions

Tonight
67°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Mostly cloudy. Low around 67, with temperatures rising to around 69 overnight. Southeast wind 10 to 15 mph. Chance of precipitation is 40%.

7-day forecast

WhenTempForecastWindPrecip
Tonight 67°F Mostly Cloudy then Chance Showers And Thunderstorms 10 to 15 mph SE 44%
Saturday 82°F Chance Showers And Thunderstorms 5 to 10 mph S 54%
Saturday Night 65°F Chance Showers And Thunderstorms then Showers And Thunderstorms 5 mph N 79%
Sunday 72°F Showers And Thunderstorms 10 to 15 mph NE 79%
Sunday Night 58°F Showers And Thunderstorms Likely 15 mph NE 62%
Monday 64°F Showers And Thunderstorms Likely 15 to 20 mph NE 61%
Monday Night 53°F Chance Rain Showers 10 to 15 mph NE 48%
Tuesday 62°F Chance Rain Showers 15 mph NE 44%
Tuesday Night 49°F Mostly Cloudy 5 to 15 mph NE 5%
Wednesday 66°F Mostly Sunny 5 to 10 mph NE 2%
Wednesday Night 52°F Partly Cloudy 0 to 5 mph NE 2%
Thursday 68°F Mostly Sunny 0 to 5 mph NE 4%
Thursday Night 54°F Partly Cloudy 0 to 5 mph NE 6%
Friday 70°F Mostly Sunny 5 mph NE 6%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Andover, IL

Last spring frost
Apr 20
First fall frost
Oct 20
Growing season
180 days
Hardiness zone
5b

Explore more for Andover, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Geneseo, Il (13.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.