Seymour, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 5 mph SSE | 0% |
| Wednesday | 85°F | Mostly Sunny | 3 to 8 mph S | 9% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms | 6 mph S | 81% |
| Thursday | 81°F | Showers And Thunderstorms | 7 mph S | 81% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms | 6 mph S | 36% |
| Friday | 82°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 23% |
| Saturday | 84°F | Slight Chance Rain Showers then Mostly Sunny | 3 to 7 mph SSW | 18% |
| Saturday Night | 69°F | Mostly Clear | 5 to 9 mph SSW | 14% |
| Sunday | 86°F | Sunny | 9 to 14 mph SSW | 9% |
| Sunday Night | 71°F | Partly Cloudy | 13 mph SSW | 11% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 12 mph SW | 17% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 12 mph SW | 28% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Seymour, IL
Last spring frost
Apr 23
First fall frost
Oct 13
Growing season
170 days
Hardiness zone
6a
Explore more for Seymour, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Champaign 9 Sw, Il (4.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.