Illinois · NWS LOT office

Mount Prospect, IL weather

It is 54°F and clear at Chicago / Wheeling, Pal-Waukee Airport as of Oct 28, 1:15 AM CDT. Overnight: Partly Cloudy, low near 53°F. Forecast from the National Weather Service, issued Oct 27, 11:35 PM CDT.

Updated Oct 28, 1:22 AM CDT (snapshot)

Current conditions

Temperature

54°F

Clear

Wind

Calm

Humidity 94% · dew point 52°F

Pressure · visibility

30.20 inHg

Visibility 10 mi

Observed at Chicago / Wheeling, Pal-Waukee Airport (KPWK), Oct 28, 1:15 AM CDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Mount Prospect forecast zone right now.

Around the NWS LOT forecast area

No active alerts in zones served by the LOT office near Mount Prospect.

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. No alerts are active anywhere in Illinois.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Mount Prospect (local time)
TimeTempForecastPrecip. chanceWind
Wed 1 AM56°FMostly Cloudy0%S 5 mph
Wed 2 AM55°FMostly Cloudy0%S 5 mph
Wed 3 AM55°FPartly Cloudy0%S 5 mph
Wed 4 AM54°FMostly Clear0%SSW 5 mph
Wed 5 AM54°FMostly Clear0%SSW 5 mph
Wed 6 AM53°FSunny0%SSW 5 mph
Wed 7 AM53°FSunny0%SSW 5 mph
Wed 8 AM54°FSunny0%SSW 5 mph
Wed 9 AM57°FSunny0%SSW 5 mph
Wed 10 AM62°FSunny0%SSW 10 mph
Wed 11 AM66°FSunny0%SSW 10 mph
Wed 12 PM68°FSunny0%SSW 10 mph
Wed 1 PM70°FSunny0%SSW 10 mph
Wed 2 PM72°FSunny0%SSW 15 mph
Wed 3 PM73°FSunny0%SSW 15 mph
Wed 4 PM73°FSunny0%SSW 15 mph
Wed 5 PM72°FSunny0%S 10 mph
Wed 6 PM70°FMostly Clear0%S 10 mph
Wed 7 PM67°FMostly Clear0%S 10 mph
Wed 8 PM66°FMostly Clear0%S 10 mph
Wed 9 PM65°FMostly Clear0%S 10 mph
Wed 10 PM65°FMostly Clear0%S 10 mph
Wed 11 PM64°FMostly Clear0%S 10 mph
Thu 12 AM64°FPartly Cloudy0%SSW 15 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Mount Prospect can differ.

7-day forecast

Overnight

Low 53°F

Partly cloudy, with a low around 53. South southwest wind around 5 mph.

Wednesday

High 74°F·Low 61°F

Sunny. High near 74, with temperatures falling to around 72 in the afternoon. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

Wednesday Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 61. South southwest wind 10 to 15 mph. Chance of precipitation is 20%.

Thursday

High 68°F·Low 48°F

A chance of rain showers before 1pm. Mostly sunny, with a high near 68. West wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Thursday Night: Mostly clear, with a low around 48. North wind 0 to 5 mph.

Friday

High 63°F·Low 51°F

A slight chance of rain showers after 1pm. Partly sunny, with a high near 63. Chance of precipitation is 20%.

Friday Night: A chance of rain showers before 1am, then a chance of showers and thunderstorms. Cloudy, with a low around 51.

Saturday

High 64°F·Low 52°F

A chance of showers and thunderstorms. Cloudy, with a high near 64.

Saturday Night: A slight chance of rain showers. Cloudy, with a low around 52.

Sunday

High 65°F·Low 53°F

A chance of rain showers. Mostly cloudy, with a high near 65.

Sunday Night: A slight chance of rain showers. Mostly cloudy, with a low around 53.

Monday

High 66°F·Low 52°F

A chance of rain showers. Mostly cloudy, with a high near 66.

Monday Night: A chance of rain showers. Cloudy, with a low around 52.

Tuesday

High 64°F

Rain showers likely. Mostly cloudy, with a high near 64.

Nearby cities

Larger cities in the area

Other cities in Cook County

See every city we cover in Illinois, or check all active alerts.

About this forecast

Forecast office
Mount Prospect is served by the National Weather Service LOT forecast office, forecast zone ILZ103, county zone ILC031.
Location used
The Census Bureau's internal point for Mount Prospect (42.0642, -87.9374), in Cook County. Population: 55,460 (2024 estimate), number 23 of the 121 Illinois cities on this site.
Radar
Nearest NWS radar: KLOT. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/42.0642,-87.9374 (forecast issued Oct 27, 11:35 PM CDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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