Seymour, IL Weather & Growing Conditions
Overnight
59°F
Chance Light Rain
A chance of rain. Cloudy, with a low around 59. South wind around 17 mph, with gusts as high as 26 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Chance Light Rain | 17 mph S | 48% |
| Wednesday | 62°F | Chance Light Rain then Patchy Drizzle | 13 to 16 mph SW | 25% |
| Wednesday Night | 45°F | Patchy Drizzle then Mostly Cloudy | 13 mph SW | 10% |
| Thursday | 61°F | Mostly Cloudy | 13 to 16 mph WSW | 14% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 6 to 9 mph NW | 20% |
| Friday | 53°F | Mostly Cloudy | 10 to 14 mph NNW | 10% |
| Friday Night | 33°F | Partly Cloudy | 5 to 12 mph NNW | 0% |
| Saturday | 53°F | Sunny | 7 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph WNW | 1% |
| Sunday | 58°F | Sunny | 5 to 10 mph WNW | 2% |
| Sunday Night | 33°F | Clear | 6 mph W | 0% |
| Monday | 63°F | Sunny | 3 to 9 mph SW | 0% |
| Monday Night | 38°F | Clear | 7 mph WSW | 0% |
| Tuesday | 66°F | Sunny | 7 mph WNW | 1% |
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 Nov 4, 2026.