Tonica, IL Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Tonica, IL in one place.
Patchy fog and showers and thunderstorms likely before 8am, then patchy fog and a chance of showers and thunderstorms between 8am and 10am, then a slight chance of showers and thunderstorms between 10am and noon. Some of the storms could produce heavy rain. Mostly cloudy. High near 83, with temperatures falling to around 80 in the afternoon. West wind 0 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Tonica, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 17, 2026 9:24 AM CDT.
The active forecast window currently covers Sep 17 to Sep 23, 2026 for Tonica, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 17 to Sep 23, 2026
- Latest sync
- Sep 17, 2026 9:24 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Tonica
Saturday looks like the warmest upcoming period in Tonica at 86 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Sunday at about 5 to 15 mph NNE.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 17, 2026 9:24 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 65. Northeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of rain showers before 4pm. Mostly cloudy. High near 79, with temperatures falling to around 76 in the afternoon. East wind 5 to 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly sunny, with a high near 86. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.
Showers and thunderstorms likely. Mostly cloudy, with a high near 74.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms likely. Mostly cloudy, with a high near 68.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
A slight chance of rain showers before 1pm. Partly sunny, with a high near 70.
Mostly cloudy, with a low around 54.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 56.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Sep 17
|
Patchy Fog then Mostly Cloudy
|
83°F |
0 to 5 mph
W
|
|
Tonight
Sep 17
|
Mostly Cloudy then Slight Chance Rain Showers
|
65°F |
5 mph
NE
|
|
Friday
Sep 18
|
Slight Chance Rain Showers
|
79°F |
5 to 10 mph
E
|
|
Friday Night
Sep 18
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
67°F |
10 mph
ESE
|
|
Saturday
Sep 19
|
Chance Showers And Thunderstorms
|
86°F |
10 mph
S
|
|
Saturday Night
Sep 19
|
Showers And Thunderstorms Likely
|
67°F |
5 mph
N
|
|
Sunday
Sep 20
|
Showers And Thunderstorms Likely
|
74°F |
5 to 15 mph
NNE
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
59°F |
10 to 15 mph
ENE
|
|
Monday
Sep 21
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
68°F |
10 to 15 mph
ENE
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
55°F |
10 to 15 mph
ENE
|
|
Tuesday
Sep 22
|
Slight Chance Rain Showers
|
70°F |
10 mph
NE
|
|
Tuesday Night
Sep 22
|
Mostly Cloudy
|
54°F |
5 to 10 mph
NE
|
|
Wednesday
Sep 23
|
Mostly Sunny
|
74°F |
5 mph
NE
|
|
Wednesday Night
Sep 23
|
Partly Cloudy
|
56°F |
5 mph
ENE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Tonica.