What is the hottest month in Sims, IL?

July is the warmest month, with a normal high of 90°F at Fairfield Radio Wfiw.

What is the coldest month in Sims, IL?

January is the coldest month, with a normal low of 25°F.

What is the wettest month in Sims, IL?

April has the most precipitation on average, about 5.00 inches.

Checked Oct 25, 2026

Sims, IL Climate

1991 to 2020 normals at Fairfield Radio Wfiw, 11 mi from the center of Sims, elevation 430 ft.

Average weather by month

Select a month for daily normals and last year's weather

Month	High	Low	Precip.	Snow
January	41°	25°	3.33 in	--
February	47°	28°	2.68 in	--
March	57°	36°	4.22 in	--
April	69°	47°	5.00 in	--
May	78°	56°	4.98 in	--
June	87°	64°	4.70 in	--
July	90°	68°	3.83 in	--
August	89°	66°	3.51 in	--
September	83°	58°	2.90 in	--
October	71°	47°	3.73 in	--
November	56°	36°	3.82 in	--
December	45°	29°	3.30 in	--
Year	68°		46.00 in	--

Frequently asked questions

What is the hottest month in Sims, IL?: July is the warmest month, with a normal high of 90°F at Fairfield Radio Wfiw.
What is the coldest month in Sims, IL?: January is the coldest month, with a normal low of 25°F.
What is the wettest month in Sims, IL?: April has the most precipitation on average, about 5.00 inches.

Today

Sims, IL forecast

Data sources

U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information · Official site
U.S. Climate Normals 1991-2020 (daily) and GHCN-Daily via Access Data ServiceNOAA National Centers for Environmental Information · Official site

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About this data

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Climate normals are 30-year averages measured at one weather station, which may be miles from the place named here or at a different elevation.

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