Fayetteville, IL Weather Forecast
Local 7-day forecast
Mostly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Fayetteville, IL in one place.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 100. South wind 0 to 3 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for Fayetteville, 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 15, 2026 5:02 AM CDT.
The active forecast window currently covers Jul 16 to Jul 21, 2026 for Fayetteville, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 16 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 5:02 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Fayetteville
Monday looks like the warmest upcoming period in Fayetteville at 95 degrees F.
Thursday Night is the coolest period ahead with temperatures near 72 degrees F.
The strongest winds are forecast for Tuesday at about 6 to 10 mph NW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 5:02 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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 1am. Partly cloudy, with a low around 72. West wind 0 to 3 mph. Chance of precipitation is 40%.
A chance of rain showers between 7am and 10am, then showers and thunderstorms likely. Mostly sunny, with a high near 90. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 70%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 93. Chance of precipitation is 20%.
Mostly clear, with a low around 74.
Sunny, with a high near 93.
Mostly clear, with a low around 73.
Mostly sunny, with a high near 95.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 74. Chance of precipitation is 20%.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 89. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 16
|
Mostly Sunny then Chance Showers And Thunderstorms
|
89°F |
0 to 3 mph
S
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms
|
72°F |
0 to 3 mph
W
|
|
Friday
Jul 17
|
Showers And Thunderstorms Likely
|
90°F |
1 to 6 mph
W
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
73°F |
1 to 5 mph
W
|
|
Saturday
Jul 18
|
Slight Chance Showers And Thunderstorms then Sunny
|
93°F |
5 to 8 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
74°F |
3 to 7 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
93°F |
6 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
73°F |
3 mph
SW
|
|
Monday
Jul 20
|
Mostly Sunny
|
95°F |
3 to 7 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
74°F |
6 mph
W
|
|
Tuesday
Jul 21
|
Slight Chance Rain Showers then Mostly Sunny
|
89°F |
6 to 10 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Fayetteville.