Current Conditions

Arlington Heights, Illinois

59°F15°C
Partly Cloudy

Wind

NE 9 mph15 km/h

Humidity

71%

Cloud Cover

78%

As of Tuesday, September 22, 2026 at 8:14 PM CDT

Today's Outlook

Night

Mostly cloudy, with a low around 57°F14°C. Breezy from the ENE at 9 to 10 mph14 to 16 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
Partly CloudyHigh 63°F17°CLow 57°F14°CPrecip 0 in0.1 mm3%Cloud 72%Wind ENE 10 mph16 km/hWednesday: Mostly cloudy and mild, with a high of 63°F17°C and morning low of 57°F14°C. Breezy from the NE at 11 to 12 mph17 to 19 km/h. Wednesday Night: Mostly cloudy, with a low around 57°F14°C. Breezy from the ENE at 9 to 10 mph14 to 16 km/h.
Partly CloudyHigh 65°F18°CLow 57°F14°CPrecip 0 in0 mmCloud 49%Wind ENE 7 mph11 km/hThursday: Partly cloudy and mild, with a high of 65°F18°C and morning low of 57°F14°C. Breezy from the ENE at 8 mph12 km/h. Thursday Night: Mostly cloudy, with a low around 58°F14°C. Breezy from the ENE at 6 to 7 mph10 to 12 km/h.
Partly CloudyHigh 66°F19°CLow 57°F14°CPrecip 0 in0 mmCloud 75%Wind E 5 mph9 km/hFriday: Mostly cloudy and mild, with a high of 66°F19°C and morning low of 57°F14°C. Breezy from the E at 6 to 7 mph9 to 12 km/h. Friday Night: Mostly cloudy, with a low around 59°F15°C. Light wind from the ENE around 5 mph8 km/h.
Partly CloudyHigh 67°F19°CLow 56°F13°CPrecip 0 in0.1 mm5%Cloud 80%Wind E 5 mph9 km/hSaturday: Overcast and mild, with a high of 67°F19°C and morning low of 56°F13°C. Light wind from the ESE around 6 mph9 km/h. Saturday Night: Mostly cloudy, with a low around 57°F14°C. Light wind from the E around 5 mph8 km/h.
DrizzleHigh 69°F21°CLow 57°F14°CPrecip 0.03 in0.7 mm11%Cloud 66%Wind ENE 4 mph6 km/hSunday: Mostly cloudy and warm, with a high of 69°F21°C and morning low of 57°F14°C. Light wind from the ENE around 4 mph6 km/h. 11% chance of drizzle in the morning. Sunday Night: Mostly cloudy, with a low around 58°F14°C. Light wind from the ENE around 4 mph6 km/h. 11% chance of drizzle before dawn.
ClearHigh 72°F22°CLow 55°F13°CPrecip 0 in0 mmCloud 33%Wind NE 4 mph7 km/hMonday: Partly cloudy and warm, with a high of 72°F22°C and morning low of 55°F13°C. Light wind from the NE around 4 mph6 km/h. Monday Night: Partly cloudy, with a low around 56°F14°C. Light wind from the ENE around 4 mph7 km/h.
ShowersHigh 72°F22°CLow 56°F13°CPrecip 0.08 in2 mm26%Cloud 69%Wind SSE 7 mph11 km/hTuesday: Mostly cloudy and warm, with a high of 72°F22°C and morning low of 56°F13°C. Breezy from the SSE at 7 to 8 mph11 to 13 km/h. Tuesday Night: Mostly cloudy, with a low around 57°F14°C. Breezy from the SSE at 7 to 9 mph11 to 14 km/h. 26% chance of showers in the evening.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
WednesdaySep 2363°F17°C57°F14°C0 in0.1 mm· 3%72%Partly CloudyENE 10 mph16 km/h
ThursdaySep 2465°F18°C57°F14°C0 in0 mm· —49%Partly CloudyENE 7 mph11 km/h
FridaySep 2566°F19°C57°F14°C0 in0 mm· —75%Partly CloudyE 5 mph9 km/h
SaturdaySep 2667°F19°C56°F13°C0 in0.1 mm· 5%80%Partly CloudyE 5 mph9 km/h
SundaySep 2769°F21°C57°F14°C0.03 in0.7 mm· 11%66%DrizzleENE 4 mph6 km/h
MondaySep 2872°F22°C55°F13°C0 in0 mm· —33%ClearNE 4 mph7 km/h
TuesdaySep 2972°F22°C56°F13°C0.08 in2 mm· 26%69%ShowersSSE 7 mph11 km/h
WednesdaySep 3068°F20°C61°F16°C0.33 in8.4 mm· 40%82%Light RainS 9 mph15 km/h
ThursdayOct 167°F20°C58°F14°C0.17 in4.3 mm· 26%67%ShowersWSW 9 mph14 km/h
FridayOct 267°F20°C56°F13°C0.13 in3.2 mm· 23%61%ShowersSW 8 mph13 km/h
SaturdayOct 369°F20°C56°F13°C0.08 in2.1 mm· 18%63%DrizzleSW 8 mph13 km/h
SundayOct 466°F19°C56°F13°C0.14 in3.6 mm· 24%64%ShowersWSW 9 mph15 km/h
MondayOct 565°F18°C53°F12°C0.1 in2.6 mm· 20%55%ShowersW 9 mph15 km/h
TuesdayOct 665°F19°C53°F12°C0.09 in2.3 mm· 17%55%DrizzleW 9 mph14 km/h
WednesdayOct 765°F18°C51°F11°C0.07 in1.8 mm· 17%44%DrizzleWNW 9 mph15 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: 42.0884°N, 87.9806°W·Elevation: 214m·Timezone: America/Chicago·Population: 75,926