Mount Prospect

Platte County, Illinois, United States

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Current Weather

19°

Overcast

Feels Like: 19°

Min: 18°

Max: 22°

The next few hours will be overcast, with today reaching 22°C and dropping to 18°C. The coming days will be mostly cloudy

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Hourly Forecast

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Today
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Daylight Hours

06:39

Sunrise

18:52

Sunset

12 hours 13 minutes of sunlight today

Moon

Waxing Crescent

12:39

Moonrise

20:53

Moonset

Daily Forecast

Today

18°
22°

Thursday

20°
24°

Friday

18°
23°

Saturday

19°
25°

Sunday

18°
21°

Monday

16°
20°

Tuesday

16°
21°

Wednesday

16°
23°

Thursday

15°
20°

Friday

16°
21°

Air Quality Data Available

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Weather in Mount Prospect today, September 16, 2026

Mount Prospect may turn murky on September 16, 2026, with fog or mist reducing clarity at times. Early travel in particular may need extra care. Expect a grey start, with morning cloud around 100% by 05:00. Outdoor plans early on should not rely on bright skies.

The temperature range runs from about 18°C up to 22°C. Relative humidity sits between 75% and 96%, reaching its peak around 23:00. Airflow remains manageable, reaching about 3.9 km/h around 17:00.

The afternoon keeps an overcast feel, as cloud reaches about 100% around 12:00. Outdoor plans may still want a flexible backup. Expect visibility near 13.3 km, with poorer spells close to 6.4 km. Sunrise is at 06:39 and sunset at 18:52, giving 12 hours 13 minutes of sunlight today.

The practical takeaway for Mount Prospect on September 16, 2026 is reduced clarity at times, so plan journeys with care near 22°C.

Frequently asked questions about weather in Mount Prospect

How warm does it get in Mount Prospect?

The warmest month in Mount Prospect is July, with average high temperatures of 28°C. The average temperature during this period is around 24°C.

How cold does it get in Mount Prospect?

The coldest month in Mount Prospect is January, with average low temperatures of -6°C. The average temperature during this period is around -4°C.

What is the wettest time of year in Mount Prospect?

The wettest month in Mount Prospect is May, with an average of 126mm of precipitation.

What is the driest time of year in Mount Prospect?

The driest month in Mount Prospect is February, with an average of 51mm of precipitation.

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