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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.