Chambersburg, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Chambersburg, IL in one place.
A chance of showers and thunderstorms before noon. Mostly cloudy, with a high near 88. Northeast wind around 6 mph. Chance of precipitation is 40%.
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: Sep 15, 2026 9:53 AM CDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Chambersburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 9:53 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Chambersburg
Thursday looks like the warmest upcoming period in Chambersburg at 91 degrees F.
Monday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Saturday at about 7 to 12 mph SW.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 9:53 AM 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 slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Southeast wind around 5 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 91. Northwest wind around 5 mph. Chance of precipitation is 20%.
Partly cloudy, with a low around 69.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 89. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 70. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 73. Chance of precipitation is 20%.
Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
88°F |
6 mph
NE
|
|
Wednesday Night
Sep 16
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
71°F |
5 mph
SE
|
|
Thursday
Sep 17
|
Slight Chance Showers And Thunderstorms
|
91°F |
5 mph
NW
|
|
Thursday Night
Sep 17
|
Partly Cloudy
|
69°F |
3 mph
NE
|
|
Friday
Sep 18
|
Slight Chance Showers And Thunderstorms
|
89°F |
6 mph
SE
|
|
Friday Night
Sep 18
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
70°F |
3 to 7 mph
SE
|
|
Saturday
Sep 19
|
Slight Chance Showers And Thunderstorms
|
88°F |
7 to 12 mph
SW
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
66°F |
7 mph
W
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
78°F |
5 to 10 mph
N
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
59°F |
6 to 10 mph
N
|
|
Monday
Sep 21
|
Slight Chance Showers And Thunderstorms
|
73°F |
6 to 10 mph
NE
|
|
Monday Night
Sep 21
|
Partly Cloudy
|
55°F |
5 to 9 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Chambersburg.