Symerton, IL Weather Forecast
Local 7-day forecast
Mostly Sunny then Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Symerton, IL in one place.
Showers and thunderstorms likely after 2pm. Mostly sunny. High near 90, with temperatures falling to around 85 in the afternoon. Heat index values as high as 103. West northwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Symerton, 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: Jul 17, 2026 3:09 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Symerton, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 3:09 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Symerton
Saturday looks like the warmest upcoming period in Symerton at 90 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Monday at about 5 to 15 mph S.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 3:09 PM CDT
- Coverage
- 6 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 chance of showers and thunderstorms before 8pm, then patchy smoke between 11pm and 1am. Mostly clear, with a low around 65. North northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Sunny, with a high near 84. East northeast wind around 5 mph.
Mostly clear, with a low around 64.
Mostly sunny, with a high near 87.
Showers and thunderstorms likely between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 71.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 86.
Mostly clear, with a low around 62.
Sunny, with a high near 80.
Mostly clear, with a low around 59.
Sunny, with a high near 80.
Partly cloudy, with a low around 60.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Mostly Sunny then Showers And Thunderstorms Likely
|
90°F |
10 mph
WNW
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms then Patchy Smoke
|
65°F |
5 to 10 mph
NNE
|
|
Sunday
Jul 19
|
Sunny
|
84°F |
5 mph
ENE
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
64°F |
0 to 5 mph
SE
|
|
Monday
Jul 20
|
Mostly Sunny
|
87°F |
5 to 15 mph
S
|
|
Monday Night
Jul 20
|
Showers And Thunderstorms Likely
|
71°F |
10 mph
SW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Mostly Sunny
|
86°F |
10 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
62°F |
5 to 15 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
80°F |
5 to 10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
59°F |
0 to 10 mph
N
|
|
Thursday
Jul 23
|
Sunny
|
80°F |
0 to 5 mph
WNW
|
|
Thursday Night
Jul 23
|
Partly Cloudy
|
60°F |
0 to 5 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Symerton.