Lake Forest

Sweet Grass County, Illinois, United States

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Current Weather

23°

Drizzle

Feels Like: 22°

Min: 19°

Max: 28°

The next few hours will be overcast, with tomorrow reaching 23°C and dropping to 12°C. The coming days will be drizzle

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Hourly Forecast

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Today
Tomorrow

Daylight Hours

06:37

Sunrise

18:53

Sunset

12 hours 16 minutes of sunlight today

Moon

Waxing Crescent

11:34

Moonrise

20:22

Moonset

Daily Forecast

Tuesday

19°
28°

Today

16°
23°

Thursday

11°
22°

Friday

10°
21°

Saturday

19°

Sunday

21°

Monday

22°

Tuesday

22°

Wednesday

19°

Thursday

16°
19°

Air Quality Data Available

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Weather in Lake Forest tomorrow, September 16, 2026

Cloud cover dominates in Lake Forest on September 16, 2026, keeping sunshine limited. Expect a grey, overcast feel rather than long bright spells. Cloud leads the morning, peaking close to 100% near 00:00. Sunshine has little room until later in the day.

The temperature range runs from about 16°C up to 23°C. Relative humidity sits between 33% and 94%, reaching its peak around 00:00. Winds stay light, near 4.9 km/h by 02:00, so the day feels still more than breezy.

Afternoon conditions open up, holding cloud close to 56% near 12:00. The day finishes on a milder, brighter note. Horizontal visibility sits around 15.7 km, briefly nearer 13.4 km. The sun rises at 06:38 and sets at 18:52, for a total of 12 hours 13 minutes of sunlight today.

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

Frequently asked questions about weather in Lake Forest

How warm does it get in Lake Forest?

The warmest month in Lake Forest is August, with average high temperatures of 24°C. The average temperature during this period is around 22°C.

How cold does it get in Lake Forest?

The coldest month in Lake Forest is January, with average low temperatures of -4°C. The average temperature during this period is around -2°C.

What is the wettest time of year in Lake Forest?

The wettest month in Lake Forest is October, with an average of 127mm of precipitation.

What is the driest time of year in Lake Forest?

The driest month in Lake Forest is February, with an average of 68mm of precipitation.

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