Thayer, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thayer, a village in Sangamon County, Illinois.
Tonight
72°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. East southeast wind around 8 mph. Chance of precipitation is 20%.
7-day forecast for Thayer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 8 mph ESE | 15% |
| Saturday | 94°F | Partly Sunny | 9 mph SSW | 7% |
| Saturday Night | 70°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 8 mph SSW | 20% |
| Sunday | 88°F | Chance Rain Showers | 2 to 7 mph NW | 43% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 9 mph NNE | 65% |
| Monday | 74°F | Showers And Thunderstorms Likely | 8 to 12 mph NE | 65% |
| Monday Night | 56°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 47% |
| Tuesday | 70°F | Chance Rain Showers then Mostly Cloudy | 12 mph NNE | 29% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 4% |
| Wednesday | 73°F | Partly Sunny | 6 to 9 mph NNE | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 7 mph NNE | 1% |
| Thursday | 73°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph NNE | 4% |
| Friday | 75°F | Mostly Sunny | 3 to 7 mph NNE | 4% |
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 19, 2026.