Thayer, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thayer, a village in Sangamon County, Illinois.
Today
86°F
Sunny
Sunny, with a high near 86. South wind around 6 mph.
7-day forecast for Thayer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 6 mph S | 0% |
| Tonight | 68°F | Mostly Clear | 6 mph SSE | 0% |
| Wednesday | 87°F | Mostly Sunny | 7 mph S | 14% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 6 mph SSE | 79% |
| Thursday | 83°F | Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSE | 21% |
| Friday | 85°F | Partly Sunny | 2 mph SW | 11% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 2 mph SSW | 26% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph SSW | 26% |
| Saturday Night | 71°F | Mostly Clear | 2 to 7 mph S | 9% |
| Sunday | 89°F | Sunny | 7 to 10 mph SSW | 5% |
| Sunday Night | 72°F | Mostly Clear | 8 mph S | 7% |
| Monday | 90°F | Mostly Sunny | 9 mph SSW | 11% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 23% |
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 Aug 4, 2026.