Chambersburg, IL Weather Forecast
Local 7-day forecast
Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Chambersburg, IL in one place.
A slight chance of rain showers between 3pm and 4pm, then a slight chance of showers and thunderstorms. Sunny, with a high near 92. Heat index values as high as 102. West wind around 9 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Chambersburg, 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 12:26 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Chambersburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 12:26 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Chambersburg
Monday looks like the warmest upcoming period in Chambersburg at 93 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Tuesday at about 6 to 12 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 12:26 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KILX
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 10pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 72. Heat index values as high as 101. Northwest wind 2 to 8 mph. Chance of precipitation is 40%.
A slight chance of rain showers before 7am. Sunny, with a high near 89. Northeast wind around 5 mph. Chance of precipitation is 20%.
Mostly clear, with a low around 70.
Mostly sunny, with a high near 93.
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 91. Chance of precipitation is 20%.
Mostly clear, with a low around 66.
Sunny, with a high near 83.
Mostly clear, with a low around 62.
Sunny, with a high near 84.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny then Slight Chance Showers And Thunderstorms
|
92°F |
9 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
72°F |
2 to 8 mph
NW
|
|
Sunday
Jul 19
|
Slight Chance Rain Showers then Sunny
|
89°F |
5 mph
NE
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
70°F |
5 mph
SE
|
|
Monday
Jul 20
|
Mostly Sunny
|
93°F |
3 to 9 mph
S
|
|
Monday Night
Jul 20
|
Mostly Clear then Slight Chance Showers And Thunderstorms
|
75°F |
8 mph
SW
|
|
Tuesday
Jul 21
|
Slight Chance Showers And Thunderstorms then Sunny
|
91°F |
6 to 12 mph
NW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
66°F |
5 to 12 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
83°F |
8 mph
NE
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
62°F |
2 to 7 mph
E
|
|
Thursday
Jul 23
|
Sunny
|
84°F |
2 to 6 mph
E
|
|
Thursday Night
Jul 23
|
Slight Chance Showers And Thunderstorms
|
65°F |
2 to 6 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Chambersburg.