What is today's weather forecast for Mc Lean, IL?

Today's forecast for Mc Lean shows a high of 31 degrees and a low of 9 degrees Fahrenheit. Mostly cloudy, with a high near 31.

What is the 7-day weather forecast for Mc Lean, IL?

The 7-day forecast for Mc Lean shows highs from 5 to 47 degrees and lows from -7 to 36 degrees Fahrenheit. Expect precipitation on 3 days with chances of 20% or higher.

Will it rain in Mc Lean, IL this week?

Yes, rain is possible in Mc Lean this week. Precipitation chances: Saturday (100% chance), Wednesday (50% chance), Thursday (50% chance).

How accurate is the Mc Lean weather forecast?

WeatherForYou provides highly accurate Mc Lean forecasts using National Weather Service data and current conditions from the nearest available weather stations, often miles closer than regional airports, for the most precise local forecasts.

Mc Lean, IL Weather Forecast and Current Conditions

Current Conditions From Nearby Station

Switch to Metric Units

26°F
Feels Like 26°F

Humidity 96% Dew Point 25°F Wind NNE 1 MPH Gusts 5 Barometer 30.12 in.

Report from a MADIS/MESONET weather station 8 mi. ESE of central Mc Lean
at 7:15 AM Fri, Dec 12, 2025

Point Forecast at a Glance

FriDec 12

SatDec 13

100%

-7

SunDec 14

-7

MonDec 15

TueDec 16

WedDec 17

ThuDec 18

50%

Jump to detailed forecast ↓

7-Day Temperature Trend

Week Ahead Summary

High temperatures dip from 31°F to a low of 5°F mid-week, then warm to 47°F. Some precipitation possible, including both rain and snow.

Climate Context

This week's forecast shows temperatures running 9°F below the historical average for December. Normal highs for this period are around 38°F with lows around 23°F.

This Date in Weather History

1967 - From December 12th through the 20th a series of snowstorms buries Flagstaff, AZ with nearly 85 inches of snow.

Mc Lean, IL 7 Day Weather Forecast Details

Friday Dec 12

Day: Mostly cloudy, with a high near 31. Northeast wind 5 to 8 mph becoming west in the afternoon.

Night: Cloudy, with a low around 9. Wind chill values between zero and 5. West wind 9 to 13 mph, with gusts as high as 21 mph.

Saturday Dec 13

Day: Snow. High near 16. Wind chill values between -4 and 2. North northwest wind around 10 mph, with gusts as high as 16 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

Night: Mostly cloudy, then gradually becoming mostly clear, with a low around -7. Wind chill values between -14 and -24. Northwest wind around 10 mph, with gusts as high as 20 mph.

Sunday Dec 14

Day: Sunny and cold, with a high near 5. Northwest wind 5 to 10 mph, with gusts as high as 18 mph.

Night: Mostly clear, with a low around -7. Light and variable wind becoming south 5 to 10 mph after midnight. Winds could gust as high as 18 mph.

Monday Dec 15

Day: Mostly sunny, with a high near 25. South southwest wind 9 to 14 mph, with gusts as high as 22 mph.

Night: Partly cloudy, with a low around 17.

Tuesday Dec 16

Day: Mostly sunny, with a high near 37.

Night: Mostly cloudy, with a low around 30.

Wednesday Dec 17

Day: Partly sunny, with a high near 45.

Night: A chance of rain. Mostly cloudy, with a low around 36.

Thursday Dec 18

Day: A chance of rain. Partly sunny, with a high near 47.

How We Provide Better Local Weather

Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.

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