Sparta, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Sparta, IL.

Current Conditions — Sparta, IL

SPARTA (KSAR)

Clear

65.1 F
Humidity:99%
Wind Speed: 4.7 mph
Barometer:29.82 in
Dewpoint:64.9 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 27 2026, 11:10 PM CDT
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5-Day Forecast — Sparta, IL

Wednesday

High 66 °F
Partly Sunny
Wednesday
Night
Low 42 °F
Mostly Cloudy
Thursday

High 66 °F
Mostly Cloudy
Thursday
Night
Low 46 °F
Mostly Cloudy
Friday

High 62 °F
Mostly Cloudy
Friday
Night
Low 39 °F
Partly Cloudy
Saturday

High 62 °F
Partly Sunny
Saturday
Night
Low 41 °F
Clear
Sunday

High 69 °F
Mostly Sunny

Detailed Forecast — Sparta, IL

Wednesday
Partly Sunny. High near 66°F. Wind 9 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly Cloudy. Low around 42°F. Wind 2 to 7 mph, with gusts as high as 14 mph.
Thursday
Mostly Cloudy. High near 66°F. Wind 2 to 5 mph, with gusts as high as 10 mph.
Thursday Night
Mostly Cloudy. Low around 46°F. Wind 2 to 3 mph, with gusts as high as 9 mph.
Friday
Mostly Cloudy. High near 62°F. Wind 6 to 8 mph, with gusts as high as 14 mph.
Friday Night
Partly Cloudy. Low around 39°F. Wind around 2 mph, with gusts as high as 7 mph.
Saturday
Partly Sunny. High near 62°F. Wind 5 to 8 mph, with gusts as high as 15 mph.
Saturday Night
Clear. Low around 41°F. Wind around 1 mph, with gusts as high as 5 mph.
Sunday
Mostly Sunny. High near 69°F. Wind 7 to 9 mph, with gusts as high as 16 mph.
Sunday Night
Slight Chance of Showers. Low around 50°F. Wind around 8 mph, with gusts as high as 15 mph.
Monday
Isolated T-storm. High near 75°F. Wind 9 to 12 mph, with gusts as high as 18 mph.
Monday Night
Mostly Clear. Low around 50°F. Wind around 5 mph, with gusts as high as 10 mph.
Tuesday
Isolated T-storm. High near 77°F. Wind 8 to 10 mph, with gusts as high as 17 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 29, 2026

Observation History — Sparta, IL

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
11:10 PM CDT 4.7 10.00 Clear -- 65.1 64.9 99% NA NA 29.82 1009.8

Regional Weather Observation

SPARTA (KSAR)

Clear
65.1 F

SCOTT AFB/BELLEV (KBLV)

NULL
57.4 F

CAHOKIA/ST LOUIS (KCPS)

Clear
57.2 F

ALTON/ST LOUIS R (KALN)

Clear
55.4 F

ST LOUIS (KSTL)

Clear
55.4 F

CENTRALIA (KENL)

Clear
57.7 F
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