McLean, IL Weather & Growing Conditions
Tonight
53°F
Rain
Rain before 1am, then rain showers likely. Mostly cloudy. Low around 53, with temperatures rising to around 58 overnight. South wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Rain | 15 to 18 mph S | 95% |
| Wednesday | 60°F | Slight Chance Rain Showers then Mostly Cloudy | 14 to 17 mph SW | 18% |
| Wednesday Night | 45°F | Mostly Cloudy | 13 mph SW | 2% |
| Thursday | 60°F | Mostly Sunny | 12 to 16 mph WSW | 7% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 6 to 9 mph NW | 23% |
| Friday | 55°F | Slight Chance Light Rain then Mostly Cloudy | 8 to 12 mph NNW | 17% |
| Friday Night | 35°F | Partly Cloudy | 3 to 10 mph N | 7% |
| Saturday | 54°F | Mostly Sunny | 6 mph NW | 2% |
| Saturday Night | 33°F | Partly Cloudy | 3 mph WSW | 3% |
| Sunday | 60°F | Sunny | 3 to 10 mph WNW | 12% |
| Sunday Night | 34°F | Mostly Clear | 5 to 8 mph WNW | 6% |
| Monday | 64°F | Sunny | 5 to 13 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 5 to 9 mph WSW | 2% |
| Tuesday | 66°F | Sunny | 5 to 8 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for McLean, IL
Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
6a
Explore more for McLean, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Bloomington 5W, Il (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.