Olney, IL Weather & Growing Conditions
Overnight
60°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 60. South wind around 12 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Chance Light Rain | 12 mph S | 35% |
| Wednesday | 66°F | Slight Chance Light Rain then Slight Chance Drizzle | 8 to 14 mph SW | 21% |
| Wednesday Night | 44°F | Slight Chance Drizzle then Partly Cloudy | 7 mph WSW | 10% |
| Thursday | 66°F | Sunny | 7 to 13 mph WSW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 3 mph WNW | 0% |
| Friday | 59°F | Partly Sunny | 3 to 12 mph NNW | 1% |
| Friday Night | 36°F | Partly Cloudy | 3 to 8 mph NNW | 0% |
| Saturday | 56°F | Sunny | 6 mph NNW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 60°F | Sunny | 1 to 8 mph WNW | 2% |
| Sunday Night | 34°F | Clear | 0 to 3 mph WNW | 1% |
| Monday | 64°F | Sunny | 0 to 6 mph WSW | 0% |
| Monday Night | 39°F | Clear | 2 mph SW | 0% |
| Tuesday | 68°F | Sunny | 2 to 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Olney, IL
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
6b
Explore more for Olney, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Olney 2S, Il (1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.