Chapin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Chapin, a village in Morgan County, Illinois.
Tonight
51°F
Light Rain Likely
Rain likely and a slight chance of thunderstorms before 3am, then a chance of rain showers. Mostly cloudy, with a low around 51. South southwest wind 10 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Chapin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Light Rain Likely | 10 to 18 mph SSW | 71% |
| Wednesday | 59°F | Chance Rain Showers then 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) for Chapin (39.767, -90.403). Updated through the day.
Growing snapshot for Chapin
Last spring frost
Apr 17
First fall frost
Oct 21
Growing season
186 days
Hardiness zone
6a
More local growing data for Chapin: nearby ZIP 62628 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Alexander
Concord
Franklin
Jacksonville
Lynnville
Meredosia
Merritt
Murrayville
Riggston
South Jacksonville
Waverly
Woodson
Climate data from the nearest NOAA station, Jacksonville 2, Il (10.3 mi from Chapin). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.