Harman US

Thayer, IL Weather & Growing Conditions

Today
91°F
Mostly Cloudy
Mostly cloudy, with a high near 91. West southwest wind around 7 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 91°F Mostly Cloudy 7 mph WSW 11%
Tonight 70°F Mostly Cloudy 7 mph SW 5%
Sunday 86°F Partly Sunny then Chance Showers And Thunderstorms 6 to 10 mph NW 38%
Sunday Night 62°F Chance Showers And Thunderstorms 8 to 13 mph NE 68%
Monday 73°F Showers And Thunderstorms Likely 8 to 12 mph NE 65%
Monday Night 55°F Chance Rain Showers 8 to 12 mph NE 47%
Tuesday 68°F Chance Rain Showers 12 mph NE 29%
Tuesday Night 51°F Mostly Cloudy 5 to 10 mph NNE 9%
Wednesday 72°F Mostly Sunny 6 to 9 mph NNE 2%
Wednesday Night 53°F Partly Cloudy 3 to 7 mph NNE 1%
Thursday 73°F Mostly Sunny 7 mph NNE 2%
Thursday Night 55°F Partly Cloudy 2 to 6 mph NNE 3%
Friday 76°F Mostly Sunny 3 to 7 mph NE 3%
Friday Night 55°F Partly Cloudy 6 mph NE 2%

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

Growing snapshot for Thayer, IL

Last spring frost
Apr 7
First fall frost
Oct 29
Growing season
205 days
Hardiness zone
6a

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

Climate data from the nearest NOAA station, Virden, Il (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.