Olney, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Olney, a city in Richland County, Illinois.
Tonight
59°F
Rain
Rain before 2am, then rain showers likely. Mostly cloudy, with a low around 59. South wind 12 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Olney
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain | 12 to 18 mph S | 95% |
| Wednesday | 67°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 13 mph SW | 20% |
| Wednesday Night | 45°F | Mostly Cloudy | 5 mph WSW | 0% |
| Thursday | 67°F | Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 3 mph WNW | 4% |
| Friday | 60°F | Mostly Cloudy | 2 to 9 mph NNW | 3% |
| Friday Night | 39°F | Partly Cloudy | 2 to 7 mph NNW | 3% |
| Saturday | 57°F | Mostly Sunny | 5 mph NNW | 1% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph WNW | 2% |
| Sunday | 62°F | Sunny | 1 to 8 mph W | 6% |
| Sunday Night | 35°F | Mostly Clear | 1 to 5 mph WNW | 5% |
| Monday | 64°F | Sunny | 1 to 8 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 68°F | Sunny | 3 to 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Olney (38.728, -88.084). Updated through the day.
Growing snapshot for Olney
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
6b
More local growing data for Olney: nearby ZIP 62450 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Olney 2S, Il (1 mi from Olney). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.