Chapin, IL Weather & Growing Conditions
Tonight
51°F
Chance Light Rain
A chance of rain before 3am. Mostly cloudy, with a low around 51. Southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Chance Light Rain | 9 to 13 mph SW | 48% |
| Wednesday | 59°F | Mostly Cloudy | 12 to 15 mph WSW | 10% |
| Wednesday Night | 42°F | Mostly Cloudy | 9 mph SW | 0% |
| Thursday | 60°F | Mostly Sunny | 8 to 13 mph WSW | 6% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 3 to 7 mph NW | 20% |
| Friday | 55°F | Partly Sunny | 6 to 9 mph NNW | 9% |
| Friday Night | 36°F | Mostly Cloudy | 1 to 7 mph N | 2% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 1% |
| Sunday | 60°F | Sunny | 2 to 8 mph W | 8% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 4% |
| Monday | 64°F | Sunny | 3 to 9 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 1% |
| Tuesday | 66°F | Sunny | 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chapin, IL
Last spring frost
Apr 17
First fall frost
Oct 21
Growing season
186 days
Hardiness zone
6a
Explore more for Chapin, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Jacksonville 2, Il (10.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.