Gillespie, IL Weather & Growing Conditions
Tonight
69°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 69. Southeast wind around 6 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SE | 20% |
| Saturday | 95°F | Mostly Sunny | 7 mph SW | 6% |
| Saturday Night | 69°F | Mostly Cloudy | 5 mph SW | 7% |
| Sunday | 90°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 6 mph NW | 31% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 8 mph NE | 62% |
| Monday | 76°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 62% |
| Monday Night | 56°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 61% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph NE | 23% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 12 mph N | 4% |
| Wednesday | 73°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph N | 2% |
| Thursday | 75°F | Mostly Sunny | 3 to 7 mph N | 4% |
| Thursday Night | 54°F | Partly Cloudy | 2 to 6 mph NE | 3% |
| Friday | 75°F | Mostly Sunny | 3 to 7 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Gillespie, IL
Last spring frost
Apr 14
First fall frost
Oct 21
Growing season
188 days
Hardiness zone
6b
Explore more for Gillespie, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Carlinville, Il (10.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.