Current Conditions

Round Lake, Illinois

71°F22°C
Light Rain

Wind

E 4 mph7 km/h

Humidity

95%

Cloud Cover

97%

As of Thursday, August 13, 2026 at 7:48 AM CDT

Today's Outlook

Day

Overcast and warm, with a high of 76°F25°C and morning low of 71°F22°C. Breezy from the E at 5 to 7 mph8 to 12 km/h. 74% chance of light rain in the afternoon. Heavy, humid air.

Night

Overcast, with a low around 72°F22°C. Light wind from the E around 5 mph9 km/h. 66% chance of light rain throughout the night.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
Light RainHigh 76°F25°CLow 71°F22°CPrecip 0.12 in3.1 mm74%Cloud 97%Wind E 5 mph8 km/hThursday: Overcast and warm, with a high of 76°F25°C and morning low of 71°F22°C. Breezy from the E at 5 to 7 mph8 to 12 km/h. 74% chance of light rain in the afternoon. Heavy, humid air. Thursday Night: Overcast, with a low around 72°F22°C. Light wind from the E around 5 mph9 km/h. 66% chance of light rain throughout the night.
RainHigh 75°F24°CLow 71°F22°CPrecip 0.38 in9.7 mm74%Cloud 95%Wind E 7 mph11 km/hFriday: Overcast and warm, with a high of 75°F24°C. Breezy from the E at 7 to 8 mph12 to 13 km/h. 74% chance of rain throughout the day. Humid. Friday Night: Overcast, with a low around 71°F22°C. Breezy from the ENE at 7 mph11 km/h. 54% chance of light rain throughout the night.
RainHigh 78°F26°CLow 72°F22°CPrecip 0.46 in11.8 mm71%Cloud 91%Wind SE 6 mph10 km/hSaturday: Overcast and warm, with a high of 78°F25°C and morning low of 72°F22°C. Breezy from the SE at 7 to 8 mph11 to 12 km/h. 71% chance of rain throughout the day. Heavy, humid air. Saturday Night: Overcast, with a low around 72°F22°C. Light wind from the SE around 6 mph9 km/h. 37% chance of light rain throughout the night.
Light RainHigh 83°F28°CFeels 88°F31°CLow 74°F23°CPrecip 0.31 in7.9 mm54%Cloud 82%Wind WNW 7 mph12 km/hSunday: Overcast and warm, with a high of 83°F28°C and morning low of 74°F23°C. Breezy from the WNW at 8 to 9 mph12 to 14 km/h. 45% chance of light rain throughout the day. Heavy, humid air. Sunday Night: Overcast, with a low around 74°F23°C. Breezy from the WNW at 7 to 8 mph11 to 12 km/h. 54% chance of light rain throughout the night.
DrizzleHigh 77°F25°CLow 68°F20°CPrecip 0.04 in1.1 mm23%Cloud 55%Wind NNE 6 mph9 km/hMonday: Mostly cloudy and warm, with a high of 77°F25°C and morning low of 68°F20°C. Light wind from the N around 6 mph9 km/h. 15% chance of drizzle around midday. Monday Night: Partly cloudy, with a low around 69°F21°C. Breezy from the NNE at 6 to 8 mph9 to 13 km/h. 23% chance of drizzle overnight.
DrizzleHigh 81°F27°CLow 66°F19°CPrecip 0.02 in0.4 mm13%Cloud 54%Wind SW 7 mph11 km/hTuesday: Mostly cloudy and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SW at 7 to 9 mph11 to 14 km/h. Tuesday Night: Partly cloudy, with a low around 66°F19°C. Breezy from the SW at 6 to 8 mph10 to 13 km/h. 13% chance of drizzle overnight.
Light RainHigh 78°F26°CLow 70°F21°CPrecip 0.3 in7.7 mm55%Cloud 76%Wind SW 9 mph14 km/hWednesday: Overcast and warm, with a high of 78°F26°C and morning low of 70°F21°C. Breezy from the SW at 9 to 10 mph15 to 16 km/h. 55% chance of light rain throughout the day. Humid. Wednesday Night: Mostly cloudy, with a low around 71°F22°C. Breezy from the SW at 9 mph14 km/h. 45% chance of light rain throughout the night.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
ThursdayAug 1376°F25°C71°F22°C0.12 in3.1 mm· 74%97%Light RainE 5 mph8 km/h
FridayAug 1475°F24°C71°F22°C0.38 in9.7 mm· 74%95%RainE 7 mph11 km/h
SaturdayAug 1578°F26°C72°F22°C0.46 in11.8 mm· 71%91%RainSE 6 mph10 km/h
SundayAug 1683°F28°C
Feels 88°F31°C
74°F23°C0.31 in7.9 mm· 54%82%Light RainWNW 7 mph12 km/h
MondayAug 1777°F25°C68°F20°C0.04 in1.1 mm· 23%55%DrizzleNNE 6 mph9 km/h
TuesdayAug 1881°F27°C66°F19°C0.02 in0.4 mm· 13%54%DrizzleSW 7 mph11 km/h
WednesdayAug 1978°F26°C70°F21°C0.3 in7.7 mm· 55%76%Light RainSW 9 mph14 km/h
ThursdayAug 2075°F24°C66°F19°C0.09 in2.3 mm· 16%54%DrizzleN 8 mph13 km/h
FridayAug 2176°F25°C64°F18°C0.04 in1.1 mm· 10%44%DrizzleE 6 mph10 km/h
SaturdayAug 2279°F26°C66°F19°C0.07 in1.8 mm· 14%44%DrizzleSSW 7 mph11 km/h
SundayAug 2380°F27°C67°F19°C0.05 in1.2 mm· 9%43%Partly CloudyS 7 mph12 km/h
MondayAug 2482°F28°C68°F20°C0.04 in1.1 mm· 9%42%Partly CloudyS 7 mph11 km/h
TuesdayAug 2582°F28°C69°F21°C0.03 in0.8 mm· 10%44%DrizzleSSE 7 mph11 km/h
WednesdayAug 2681°F27°C69°F20°C0.05 in1.2 mm· 12%45%DrizzleNE 8 mph12 km/h
ThursdayAug 2778°F25°C67°F20°C0.07 in1.7 mm· 16%50%DrizzleNE 7 mph12 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: 42.3534°N, 88.0934°W·Elevation: 243m·Timezone: America/Chicago·Population: 18,461