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Lake Forest, IL Weather
Current conditions
Observed at Chicago / Wheeling, Pal-Waukee Airport · 45 min ago
Forecast
10-day-
Tuesday
Areas of fog before 9am. Sunny. High near 64, with temperatures falling to around 61 in the afternoon. East wind 0 to 10 mph.
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Tuesday Night
Areas of fog after 4am. Partly cloudy. Low around 44, with temperatures rising to around 46 overnight. South southeast wind 0 to 5 mph.
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Wednesday
Areas of fog before 8am. Mostly sunny, with a high near 68. South southwest wind 0 to 5 mph.
National Weather Service forecast updated 10 hrs ago.
Hourly
Hourly forecast- Now64°
- 3 PM64°
- 4 PM64°
- 5 PM61°
- 6 PM59°
- 7 PM55°
- 8 PM54°
- 9 PM53°
- 10 PM52°
- 11 PM51°
- Wed12 AM50°
- 1 AM50°
- 2 AM49°
- 3 AM48°
- 4 AM47°
- 5 AM46°
- 6 AM45°
- 7 AM45°
- 8 AM46°
- 9 AM52°
- 10 AM57°
- 11 AM61°
- 12 PM64°
- 1 PM66°
10-day forecast
Details- TonightOct 19Areas Of Fog45°
- TodayOct 20Areas Of Fog then Sunny44°64°
- WedOct 21Areas Of Fog then Mostly Sunny48°68°
- ThuOct 22Sunny51°66°
- FriOct 23Sunny49°64°
- SatOct 24Mostly Sunny52°66°
- SunOct 25Partly Sunny49°68°
- MonOct 26Partly Sunny then Slight Chance Rain Showers15%64°
- TueOct 27Cloudy44°54°
- WedOct 28Cloudy43°53°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in Illinois
More weather news-
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A great week ahead for Central IllinoisWAND DECATUR, Ill. (WAND) – A wonderful weekend across Central Illinois carries into the start of the workweek. Overnight lows dip back into the upper 30s tonight with a small risk for patchy frost, though coverage will…
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Overnight Frost Advisory for parts of Illinois, NW IndianaCBS News Colorado 10pm Saturday CBS News Detroit Weekend 11pm CBS News Los Angeles Weekend 9pm CBS News Philadelphia Weekend 11pm KDKA News Weekend 11pm CBS News Texas Weekend 10pm
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Frost advisory back in effect for Central IllinoisWAND DECATUR, Ill. (WAND) – Another cool day starts the weekend across Central Illinois with highs Saturday only reaching the upper 50s under plenty of sunny skies. Strong high pressure remains in control keeping skies…
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Frosty Nights Ahead Before a Warm-Up Arrives in Central IllinoisCENTRAL ILLINOIS (25News Now) - Central Illinois is in for a chilly weekend, with temperatures dropping into the 30s and frost possible overnight. But after a cool start to the weekend, a warming trend will bring…
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Dangerous Freeze Warnings Issued for Iowa, Wisconsin, Minnesota and Illinois as Temperatures DropFreeze Warnings take effect early Saturday across much of Iowa, Wisconsin, southeast and central Minnesota and northern Illinois, with lows as cold as 26 degrees expected. Seven National Weather Service offices issued…
Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueModerate
- WedModerate
- ThuModerate
Lake County, IL reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyKenosha Wwtp, records since 1944. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Chicago 48 km
- Naperville 58 km
- Elgin 44 km
- Kenosha 36 km
- Waukegan 12 km
- Cicero 46 km
- Racine 52 km
- Arlington Heights 22 km
- Evanston 27 km
- Schaumburg 32 km
- Palatine 23 km
- Skokie 27 km
Forecasters' discussion
From the National Weather Service office in LOT, issued 8 hrs ago
Key Messages
- Some ground fog may develop within 10-15 miles of Lake Michigan during early morning hours the next few days. Any fog would then quickly dissipate after sunrise.
- An extended period of dry and above to much above average temperatures is expected through the upcoming weekend.
Discussion
Issued at 154 AM CDT Tue Oct 20 2026
No significant weather is expected through the upcoming weekend with above to much above average temperatures each day. Generally light winds should allow weak lake breezes to form each of the next several afternoons, but only result in slightly cooler conditions right near the lake. A modest increase in moisture in the wake of the afternoon lake breezes could allow for some ground fog to form during the early morning hours the next few days. Otherwise, look for mostly sunny conditions for the remainder of the work week.
- Borchardt/Izzi
Aviation
Issued at 620 AM CDT Tue Oct 20 2026
Key Aviation Messages for the current TAF period:
- Patchy fog, locally dense, expected through sunrise today for Chicago terminals north of a KARR to KMDW line
- Another chance for fog tomorrow morning for terminals closer to the lake
A locally dense fog bank is slowly moving west-southwest through northeastern Illinois this morning. The densest portion of this fog dropped visibilities at KORD down to 1/8SM. This fog is expected to impact terminals north of a KARR to KMDW line. Some MVFR vis may develop south of this border, but there is lower confidence in dense fog currently. Once the sun rises, visibilities are expected to improve back to VFR conditions.
Winds are expected to be light and mostly out of the east- southeast today. Clear skies are expected tonight with light, if not calm, winds across the area leading to another chance for fog developing closer to the lake, similar to what is happening this morning. A TEMPO was added for tomorrow morning introducing reduced vis which can be adjusted in later TAF packages with updated confidence in fog development.
Lot Watches
IL...Dense Fog Advisory until 9 AM CDT this morning for ILZ005- ILZ006-ILZ013-ILZ103-ILZ104.
IN...None. LM...None.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.