Chatham, IL Weather Forecast & Alerts

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

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Current Conditions — Chatham, IL

SPRINGFIELD (KSPI)

Clear

57.2 F
Humidity:%
Wind Speed: 5.7 mph
Barometer:30.07 in
Dewpoint: F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 30 2026, 10:00 AM CDT
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5-Day Forecast — Chatham, IL

Thursday

High 64 °F
Chance of T-storms
Thursday
Night
Low 41 °F
Chance of Rain
Friday

High 60 °F
Slight Chance of Showers
Friday
Night
Low 39 °F
Partly Cloudy
Saturday

High 59 °F
Partly Sunny
Saturday
Night
Low 39 °F
Clear
Sunday

High 73 °F
Mostly Sunny
Sunday
Night
Low 50 °F
Chance of Scattered T-storms
Monday

High 75 °F
Isolated T-storm

Detailed Forecast — Chatham, IL

Thursday
Chance of Thunderstorms. High near 64°F. Wind 3 to 12 mph, with gusts as high as 17 mph.
Thursday Night
Chance of Rain. Low around 41°F. Wind 6 to 7 mph, with gusts as high as 13 mph.
Friday
Slight Chance of Showers. High near 60°F. Wind 7 to 10 mph, with gusts as high as 16 mph.
Friday Night
Partly Cloudy. Low around 39°F. Wind 3 to 5 mph, with gusts as high as 8 mph.
Saturday
Partly Sunny. High near 59°F. Wind 7 to 10 mph, with gusts as high as 16 mph.
Saturday Night
Clear. Low around 39°F. Wind around 3 mph, with gusts as high as 6 mph.
Sunday
Mostly Sunny. High near 73°F. Wind 14 to 17 mph, with gusts as high as 24 mph.
Sunday Night
Chance of Scattered Thunderstorms. Low around 50°F. Wind around 10 mph, with gusts as high as 17 mph.
Monday
Isolated T-storm. High near 75°F. Wind 10 to 15 mph, with gusts as high as 22 mph.
Monday Night
Slight Chance of Showers. Low around 48°F. Wind around 7 mph, with gusts as high as 12 mph.
Tuesday
Isolated T-storm. High near 73°F. Wind 9 to 14 mph, with gusts as high as 20 mph.
Tuesday Night
Chance of Thunderstorms. Low around 51°F. Wind around 10 mph, with gusts as high as 16 mph.
Wednesday
Chance of Thunderstorms. High near 71°F. Wind 13 to 15 mph, with gusts as high as 22 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 30, 2026

Observation History — Chatham, 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)
10:00 AM CDT 5.7 10.00 Clear -- 57.2 % NA NA 30.07 1018.3
09:50 AM CDT 6.9 10.00 Clear -- 57.2 32.0 38% NA NA 30.07 1018.3
09:45 AM CDT 6.9 10.00 Clear -- 55.4 33.8 44% NA NA 30.06 1017.9
09:35 AM CDT W 4.6 10.00 Clear -- 55.4 33.8 44% NA NA 30.06 1017.9
09:25 AM CDT 0.0 10.00 Clear -- 55.4 33.8 44% NA NA 30.06 1017.9
09:20 AM CDT 4.6 10.00 Clear -- 55.4 35.6 47% NA NA 30.06 1017.9
09:05 AM CDT SW 3.4 10.00 Clear -- 53.6 37.4 54% NA NA 30.08 1018.6
09:00 AM CDT SW 3.4 10.00 Clear -- 53.6 37.4 54% NA NA 30.08 1018.6
08:50 AM CDT 3.4 10.00 Clear -- 51.8 37.4 58% NA NA 30.08 1018.6
08:35 AM CDT 4.6 10.00 Clear -- 51.8 39.2 62% NA NA 30.09 1019.0
08:30 AM CDT 4.6 10.00 Clear -- 50.0 39.2 66% NA NA 30.09 1019.0
08:20 AM CDT 4.6 10.00 Clear -- 48.2 39.2 71% 46.4 NA 30.09 1019.0
08:15 AM CDT SW 4.6 10.00 Clear -- 48.2 39.2 71% 46.4 NA 30.08 1018.6
08:00 AM CDT SW 3.4 10.00 Clear -- 46.4 39.2 76% 45.1 NA 30.08 1018.6
07:50 AM CDT 4.6 10.00 Clear -- 46.4 37.4 71% 44.2 NA 30.08 1018.6
07:45 AM CDT 4.6 10.00 Clear -- 44.6 37.4 76% 42.1 NA 30.08 1018.6
07:40 AM CDT 3.4 10.00 Clear -- 44.6 37.4 76% 43.2 NA 30.08 1018.6
07:35 AM CDT 3.4 10.00 Clear -- 44.6 39.2 81% 43.2 NA 30.08 1018.6
07:25 AM CDT SW 3.4 10.00 Clear -- 42.8 39.2 87% 41.0 NA 30.07 1018.3
07:15 AM CDT 3.4 10.00 Clear -- 42.8 39.2 87% 41.0 NA 30.07 1018.3
07:10 AM CDT SW 3.4 10.00 Clear -- 42.8 37.4 81% 41.0 NA 30.07 1018.3
07:05 AM CDT 3.4 10.00 Clear -- 41.0 37.4 87% 39.0 NA 30.07 1018.3
07:00 AM CDT SW 3.4 10.00 Clear -- 39.2 37.4 93% 37.0 NA 30.07 1018.3
06:50 AM CDT 4.6 10.00 Clear -- 39.2 37.4 93% 35.8 NA 30.07 1018.3

Regional Weather Observation

SPRINGFIELD (KSPI)

Clear
57.2 F

JACKSONVILLE (KIJX)

Clear
56.5 F

TAYLORVILLE (KTAZ)

Clear
55.4 F

LINCOLN (KAAA)

Clear
55.8 F

MOUNT STERLING (KI63)

Mostly Cloudy
57.0 F

LITCHFIELD MUNI (K3LF)

Clear
54.7 F
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