Deerfield

Sweet Grass County, Illinois, United States

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Current Weather

21°

Overcast

Feels Like:

Min: 19°

Max: 29°

The next few hours will be overcast, with today reaching 29°C and dropping to 10°C. The coming days will be drizzle

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Compare today's weather with yesterday's data and track temperature trends over time.

Hourly Forecast

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Daylight Hours

06:37

Sunrise

18:53

Sunset

12 hours 16 minutes of sunlight today

Moon

Waxing Crescent

11:34

Moonrise

20:23

Moonset

Daily Forecast

Today

19°
29°

Wednesday

21°

Thursday

10°
21°

Friday

20°

Saturday

19°

Sunday

20°

Monday

21°

Tuesday

20°

Wednesday

11°
19°

Thursday

16°
19°

Air Quality Data Available

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UV Index

No protection needed
0 Low
Low Extreme

Humidity

63% Comfortable
Low High

Weather in Deerfield today, September 15, 2026

Expect a muted, overcast feel in Deerfield on September 15, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Cloud leads the morning, peaking close to 100% near 07:00. Sunshine has little room until later in the day.

The day peaks near 29°C and cools toward 19°C. Expect humidity between 55% and 93%, most humid near 23:00. A lighter breeze peaks around 15:00 near 4.1 km/h.

Afternoon skies stay clogged, peaking close to 100% near 12:00. The grey theme continues rather than clearing out. Visibility holds near 15.8 km, though it can fall to 13.8 km. Sunrise is at 06:37 and sunset at 18:53, giving 12 hours 16 minutes of sunlight today.

Overall, Deerfield on September 15, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 29°C.

Frequently asked questions about weather in Deerfield

How warm does it get in Deerfield?

The warmest month in Deerfield 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 Deerfield?

The coldest month in Deerfield 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 Deerfield?

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

What is the driest time of year in Deerfield?

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

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