Summit

Platte County, Illinois, United States

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Current Weather

26°

Clear

Feels Like: 29°

Min: 19°

Max: 30°

The next few hours will be overcast, with tomorrow reaching 22°C and dropping to 21°C. The coming days will be drizzle

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Hourly Forecast

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Today
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Daylight Hours

06:37

Sunrise

18:53

Sunset

12 hours 15 minutes of sunlight today

Moon

Waxing Crescent

11:32

Moonrise

20:23

Moonset

Daily Forecast

Today

19°
30°

Wednesday

20°
22°

Thursday

21°
25°

Friday

20°
23°

Saturday

19°
25°

Sunday

20°
22°

Monday

18°
21°

Tuesday

17°
22°

Wednesday

16°
22°

Thursday

14°
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 Summit tomorrow, September 16, 2026

Expect a muted, overcast feel in Summit on September 16, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Expect a grey start, with morning cloud around 100% by 00:00. Outdoor plans early on should not rely on bright skies.

Temperatures climb from an overnight low near 20°C toward a daytime high of about 22°C. The air stays humid, with relative humidity between 83% and 97% and the peak around 03:00. Winds stay light, near 3.4 km/h by 05:00, so the day feels still more than breezy.

Through the afternoon cloud remains the main feature, with cover near 91% around 13:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 13.9 km, briefly nearer 2.4 km. Sunrise is at 06:38 and sunset at 18:51, giving 12 hours 12 minutes of sunlight today.

The practical takeaway for Summit on September 16, 2026 is a cloudy day that stays usable, just not particularly bright, around 22°C.

Frequently asked questions about weather in Summit

How warm does it get in Summit?

The warmest month in Summit is July, with average high temperatures of 28°C. The average temperature during this period is around 23°C.

How cold does it get in Summit?

The coldest month in Summit is January, with average low temperatures of -5°C. The average temperature during this period is around -3°C.

What is the wettest time of year in Summit?

The wettest month in Summit is May, with an average of 123mm of precipitation.

What is the driest time of year in Summit?

The driest month in Summit is February, with an average of 61mm of precipitation.

View full climate insights for Summit →

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Metric (°C, km/h)