McLean, IL Weather & Growing Conditions
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 7 mph S | 0% |
| Tonight | 66°F | Partly Cloudy | 6 mph SSE | 1% |
| Wednesday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 8 mph S | 24% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 7 mph SSE | 80% |
| Thursday | 81°F | Showers And Thunderstorms | 7 mph SSW | 80% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms | 5 mph S | 17% |
| Friday | 83°F | Mostly Sunny | 3 mph SSW | 9% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 mph SSE | 23% |
| Saturday | 85°F | Mostly Sunny | 5 to 8 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 6 to 9 mph S | 11% |
| Sunday | 88°F | Sunny | 8 to 13 mph SSW | 9% |
| Sunday Night | 72°F | Partly Cloudy | 8 to 13 mph SSW | 13% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 12 mph SSW | 15% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 10 mph SSW | 27% |
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 Aug 4, 2026.