Lemont

Platte County, Illinois, United States

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Current Weather

22°

Overcast

Feels Like: 20°

Min: 20°

Max: 23°

The next few hours will be overcast, with today reaching 23°C and dropping to 20°C. The coming days will be mostly cloudy throughout the day.

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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 12 minutes of sunlight today

Moon

Waxing Crescent

12:38

Moonrise

20:54

Moonset

Daily Forecast

Today

20°
23°

Thursday

20°
25°

Friday

18°
24°

Saturday

19°
26°

Sunday

19°
22°

Monday

17°
22°

Tuesday

16°
22°

Wednesday

16°
23°

Thursday

14°
21°

Friday

16°
21°

Air Quality Data Available

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UV Index

No protection needed
0 Low
Low Extreme

Humidity

76% Humid
Low High

Weather in Lemont today, September 16, 2026

Expect a muted, overcast feel in Lemont on September 16, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. The first half of the day looks overcast, as cloud amounts reach about 100% around 03:00. Brighter weather, if it comes, waits until later.

Temperatures climb from an overnight low near 20°C toward a daytime high of about 23°C. Moisture in the air spans 76%-97%, with the highest values around 23:00. Expect gentle winds, highest near 07:00 at 5.6 km/h.

Through the afternoon cloud remains the main feature, with cover near 100% around 12:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 11.8 km, briefly nearer 2.1 km. Daylight runs from 06:39 to 18:52, lasting 12 hours 12 minutes of sunlight today.

The practical takeaway for Lemont on September 16, 2026 is a cloudy day that stays usable, just not particularly bright, around 23°C.

Frequently asked questions about weather in Lemont

How warm does it get in Lemont?

The warmest month in Lemont is July, with average high temperatures of 29°C. The average temperature during this period is around 24°C.

How cold does it get in Lemont?

The coldest month in Lemont is January, with average low temperatures of -6°C. The average temperature during this period is around -3°C.

What is the wettest time of year in Lemont?

The wettest month in Lemont is May, with an average of 124mm of precipitation.

What is the driest time of year in Lemont?

The driest month in Lemont is November, with an average of 55mm of precipitation.

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Metric (°C, km/h)