Current Conditions

Lake Forest, Illinois

61°F16°C
Partly Cloudy

Wind

ENE 15 mph25 km/h

Humidity

72%

Cloud Cover

56%

As of Tuesday, September 22, 2026 at 8:33 PM CDT

Today's Outlook

Night

Mostly cloudy, with a low around 58°F15°C. Breezy from the ENE at 12 to 15 mph19 to 23 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
Partly CloudyHigh 63°F17°CLow 58°F14°CPrecip 0 in0.1 mm1%Cloud 64%Wind ENE 12 mph20 km/hWednesday: Mostly cloudy and mild, with a high of 62°F17°C and morning low of 58°F14°C. Breezy from the NE at 13 mph21 km/h. Wednesday Night: Mostly cloudy, with a low around 58°F15°C. Breezy from the ENE at 12 to 15 mph19 to 23 km/h.
Partly CloudyHigh 63°F17°CLow 59°F15°CPrecip 0 in0 mmCloud 43%Wind ENE 9 mph15 km/hThursday: Partly cloudy and mild, with a high of 63°F17°C. Breezy from the ENE at 10 to 11 mph16 to 17 km/h. Thursday Night: Mostly cloudy, with a low around 60°F16°C. Breezy from the ENE at 9 to 11 mph14 to 17 km/h.
Partly CloudyHigh 64°F18°CLow 60°F15°CPrecip 0 in0 mmCloud 73%Wind E 7 mph12 km/hFriday: Mostly cloudy and mild, with a high of 64°F18°C and morning low of 60°F15°C. Breezy from the E at 7 to 8 mph12 to 14 km/h. Friday Night: Mostly cloudy, with a low around 61°F16°C. Breezy from the E at 7 to 8 mph12 to 13 km/h.
Partly CloudyHigh 64°F18°CLow 60°F15°CPrecip 0 in0.1 mm3%Cloud 77%Wind E 7 mph12 km/hSaturday: Overcast and mild, with a high of 64°F18°C and morning low of 60°F15°C. Breezy from the ESE at 8 mph12 km/h. Saturday Night: Mostly cloudy, with a low around 61°F16°C. Breezy from the E at 7 to 8 mph12 to 13 km/h.
DrizzleHigh 66°F19°CLow 61°F16°CPrecip 0.02 in0.6 mm13%Cloud 65%Wind ENE 5 mph9 km/hSunday: Mostly cloudy and mild, with a high of 66°F19°C and morning low of 61°F16°C. Light wind from the ENE around 5 mph8 km/h. 13% chance of drizzle in the morning. Sunday Night: Mostly cloudy, with a low around 61°F16°C. Light wind from the ENE around 5 mph9 km/h.
ClearHigh 68°F20°CLow 60°F16°CPrecip 0 in0 mmCloud 32%Wind NE 5 mph9 km/hMonday: Partly cloudy and mild, with a high of 68°F20°C and morning low of 60°F16°C. Light wind from the NE around 5 mph8 km/h. Monday Night: Partly cloudy, with a low around 61°F16°C. Light wind from the ENE around 6 mph10 km/h.
ShowersHigh 69°F21°CLow 61°F16°CPrecip 0.08 in2 mm26%Cloud 68%Wind SSE 9 mph15 km/hTuesday: Mostly cloudy and warm, with a high of 69°F21°C and morning low of 61°F16°C. Breezy from the SSE at 9 to 11 mph15 to 17 km/h. 10% chance of drizzle around midday. Tuesday Night: Mostly cloudy, with a low around 62°F16°C. Breezy from the SSE at 9 to 12 mph15 to 19 km/h. 26% chance of showers in the evening.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
WednesdaySep 2363°F17°C58°F14°C0 in0.1 mm· 1%64%Partly CloudyENE 12 mph20 km/h
ThursdaySep 2463°F17°C59°F15°C0 in0 mm· —43%Partly CloudyENE 9 mph15 km/h
FridaySep 2564°F18°C60°F15°C0 in0 mm· —73%Partly CloudyE 7 mph12 km/h
SaturdaySep 2664°F18°C60°F15°C0 in0.1 mm· 3%77%Partly CloudyE 7 mph12 km/h
SundaySep 2766°F19°C61°F16°C0.02 in0.6 mm· 13%65%DrizzleENE 5 mph9 km/h
MondaySep 2868°F20°C60°F16°C0 in0 mm· —32%ClearNE 5 mph9 km/h
TuesdaySep 2969°F21°C61°F16°C0.08 in2 mm· 26%68%ShowersSSE 9 mph15 km/h
WednesdaySep 3066°F19°C62°F17°C0.34 in8.6 mm· 40%81%Light RainS 12 mph20 km/h
ThursdayOct 165°F18°C60°F16°C0.19 in4.9 mm· 28%67%ShowersWSW 12 mph19 km/h
FridayOct 265°F18°C59°F15°C0.14 in3.5 mm· 22%61%ShowersSW 11 mph17 km/h
SaturdayOct 366°F19°C59°F15°C0.09 in2.3 mm· 20%62%DrizzleSSW 10 mph17 km/h
SundayOct 464°F18°C59°F15°C0.15 in3.9 mm· 24%63%ShowersWSW 12 mph19 km/h
MondayOct 563°F17°C56°F13°C0.12 in3 mm· 24%55%ShowersW 12 mph19 km/h
TuesdayOct 663°F17°C56°F13°C0.11 in2.7 mm· 19%56%DrizzleW 12 mph19 km/h
WednesdayOct 762°F17°C55°F13°C0.08 in2.1 mm· 18%44%DrizzleNW 12 mph20 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

PatternExampleDescription
/weather/{country}/{city}//weather/united-states/san-francisco/City forecast (canonical URL)
/weather/{city}//weather/tokyo/Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}//weather/united-states/california/san-francisco/With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}/weather/nearby?lat=48.1&lon=11.5Find nearest city by coordinates
/weather/{country}//weather/germany/Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 42.2586°N, 87.8406°W·Elevation: 210m·Timezone: America/Chicago·Population: 19,408