Tonica, IL Weather Forecast & Alerts

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

Current Conditions — Tonica, IL

PERU (KVYS)

Partly Cloudy

67.1 F
Humidity:72%
Wind Speed:W 16.1 G 20.8 mph
Barometer:29.96 in
Dewpoint:57.9 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 08:55 AM CDT
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5-Day Forecast — Tonica, IL

Wednesday

High 80 °F
Mostly Cloudy
Wednesday
Night
Low 59 °F
Mostly Clear
Thursday

High 82 °F
Partly Sunny
Thursday
Night
Low 62 °F
T-storms Likely
Friday

High 75 °F
T-storms Likely
Friday
Night
Low 50 °F
Mostly Clear
Saturday

High 71 °F
Mostly Sunny
Saturday
Night
Low 48 °F
Mostly Cloudy
Sunday

High 73 °F
Partly Sunny

Detailed Forecast — Tonica, IL

Wednesday
Mostly Cloudy. High near 80°F. Wind 7 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly Clear. Low around 59°F. Wind 6 to 8 mph, with gusts as high as 16 mph.
Thursday
Partly Sunny. High near 82°F. Wind 10 to 20 mph, with gusts as high as 29 mph.
Thursday Night
Thunderstorms Likely. Low around 62°F. Wind 16 to 17 mph, with gusts as high as 26 mph.
Friday
Thunderstorms Likely. High near 75°F. Wind 10 to 15 mph, with gusts as high as 24 mph.
Friday Night
Mostly Clear. Low around 50°F. Wind around 8 mph, with gusts as high as 15 mph.
Saturday
Mostly Sunny. High near 71°F. Wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday Night
Mostly Cloudy. Low around 48°F. Wind around 6 mph, with gusts as high as 13 mph.
Sunday
Partly Sunny. High near 73°F. Wind 13 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Chance of Thunderstorms. Low around 55°F. Wind around 17 mph, with gusts as high as 28 mph.
Monday
Thunderstorms Likely. High near 75°F. Wind 20 to 23 mph, with gusts as high as 35 mph.
Monday Night
Chance of Rain. Low around 50°F. Wind around 17 mph, with gusts as high as 24 mph.
Tuesday
Partly Sunny. High near 66°F. Wind 10 to 17 mph, with gusts as high as 26 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 22, 2026

Observation History — Tonica, 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)
08:55 AM CDT W 16.1 G 20.8 10.00 Partly Cloudy -- 67.1 57.9 72% NA NA 29.96 1014.6
08:38 AM CDT G 21.9 10.00 Partly Cloudy -- 66.2 57.2 73% NA NA 29.96 1014.6
08:15 AM CDT 13.9 G 19.7 10.00 Partly Cloudy -- 65.5 57.6 76% NA NA 29.96 1014.6
07:58 AM CDT 11.4 G 17.2 10.00 Clear -- 64.4 57.2 77% NA NA 29.96 1014.6
07:35 AM CDT 12.8 G 18.3 10.00 Clear -- 63.9 57.4 79% NA NA 29.96 1014.6
06:55 AM CDT 12.8 G 18.3 10.00 Clear -- 63.1 57.2 81% NA NA 29.95 1014.2
06:35 AM CDT 12.8 10.00 Clear -- 63.0 57.2 81% NA NA 29.94 1013.9
05:50 AM CDT SW 13.9 10.00 Partly Cloudy -- 63.5 57.2 80% NA NA 29.94 1013.9
05:35 AM CDT SW 13.9 10.00 Partly Cloudy -- 63.5 57.2 80% NA NA 29.94 1013.6
05:00 AM CDT SW 8.1 G 11.4 10.00 Partly Cloudy -- 63.9 56.7 77% NA NA 29.92 1013.2
04:15 AM CDT SW 12.8 10.00 Clear -- 64.6 56.3 75% NA NA 29.92 1013.2
03:58 AM CDT SW 10.3 10.00 Clear -- 64.4 55.4 73% NA NA 29.91 1012.9
03:38 AM CDT SW 11.4 10.00 Clear -- 64.4 55.4 73% NA NA 29.91 1012.9
03:15 AM CDT SW 11.4 G 16.1 10.00 Clear -- 65.7 55.9 71% NA NA 29.90 1012.5
03:00 AM CDT SW 11.4 10.00 Clear -- 66.2 55.6 69% NA NA 29.90 1012.5
02:38 AM CDT SW 10.3 10.00 Clear -- 66.2 55.4 68% NA NA 29.90 1012.5
02:10 AM CDT SW 10.3 10.00 Clear -- 66.9 55.4 66% NA NA 29.90 1012.5
01:55 AM CDT 11.4 G 16.1 10.00 Clear -- 66.6 55.2 67% NA NA 29.91 1012.9
01:35 AM CDT 10.3 10.00 Clear -- 66.4 55.0 67% NA NA 29.91 1012.9
12:50 AM CDT SW 9.2 10.00 Clear -- 66.0 54.9 67% NA NA 29.90 1012.5
12:35 AM CDT SW 8.1 10.00 Clear -- 66.4 55.0 67% NA NA 29.90 1012.5
12:15 AM CDT SW 9.2 10.00 Clear -- 66.4 55.4 68% NA NA 29.90 1012.5
11:58 PM CDT SW 8.1 10.00 Clear -- 66.2 55.4 68% NA NA 29.90 1012.5
11:35 PM CDT SW 9.2 10.00 Clear -- NULL % NA NA 29.90 1012.5

Regional Weather Observation

PERU (KVYS)

Partly Cloudy
67.1 F

LACON (KC75)

Mostly Cloudy
65.7 F

ROCHELLE/KORITZ (KRPJ)

Partly Cloudy
65.1 F

STERLING ROCKFAL (KSQI)

Clear
68.0 F

MORRIS-WASHBURN (KC09)

Clear
66.2 F

CHICAGO/AURORA (KARR)

Partly Cloudy
66.2 F
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