Thayer, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thayer, a village in Sangamon County, Illinois.
Tonight
52°F
Rain
Rain before 2am, then a chance of rain showers between 2am and 5am. Cloudy, with a low around 52. South southwest wind 10 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Thayer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Rain | 10 to 15 mph SSW | 95% |
| Wednesday | 61°F | Mostly Cloudy | 10 to 15 mph SW | 10% |
| Wednesday Night | 42°F | Partly Cloudy | 8 mph SW | 0% |
| Thursday | 62°F | Mostly Sunny | 7 to 12 mph WSW | 4% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 6 mph NW | 22% |
| Friday | 57°F | Mostly Cloudy | 6 to 10 mph NNW | 11% |
| Friday Night | 35°F | Mostly Cloudy | 1 to 8 mph NNW | 3% |
| Saturday | 55°F | Mostly Sunny | 3 mph NW | 1% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph W | 1% |
| Sunday | 61°F | Sunny | 2 to 7 mph W | 7% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 4% |
| Monday | 65°F | Sunny | 3 to 9 mph SW | 2% |
| Monday Night | 38°F | Mostly Clear | 6 mph SW | 1% |
| Tuesday | 67°F | Sunny | 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Thayer (39.540, -89.758). Updated through the day.
Growing snapshot for Thayer
Last spring frost
Apr 7
First fall frost
Oct 29
Growing season
205 days
Hardiness zone
6a
More local growing data for Thayer: nearby ZIP 62689 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Virden, Il (1.9 mi from Thayer). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.