Thayer, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thayer, a village in Sangamon County, Illinois.
This Afternoon
91°F
Cloudy
Cloudy, with a high near 91. Southwest wind around 6 mph.
7-day forecast for Thayer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 91°F | Cloudy | 6 mph SW | 8% |
| Tonight | 70°F | Mostly Cloudy | 7 mph SW | 4% |
| Sunday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph NW | 46% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 68% |
| Monday | 73°F | Showers And Thunderstorms Likely | 9 mph NE | 65% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 9 mph NE | 50% |
| Tuesday | 69°F | Chance Rain Showers then Mostly Cloudy | 12 mph NE | 50% |
| Tuesday Night | 52°F | Mostly Cloudy | 5 to 9 mph NNE | 3% |
| Wednesday | 70°F | Partly Sunny | 8 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 7 mph NNE | 0% |
| Thursday | 74°F | Partly Sunny | 6 mph NNE | 0% |
| Thursday Night | 56°F | Mostly Cloudy | 5 mph NNE | 14% |
| Friday | 77°F | Slight Chance Rain Showers | 2 to 6 mph NE | 16% |
| Friday Night | 55°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NE | 16% |
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 Sep 20, 2026.