Harrisburg, IL Weather Forecast
Local 7-day forecast
Patchy Fog then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harrisburg, IL in one place.
Patchy fog before 9am. Sunny, with a high near 91. East southeast wind 0 to 5 mph.
Local Weather Overview
This forecast page for Harrisburg, 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: Aug 28, 2026 10:15 PM CDT.
The active forecast window currently covers Aug 29 to Sep 4, 2026 for Harrisburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 28, 2026 10:15 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Harrisburg
Thursday looks like the warmest upcoming period in Harrisburg at 98 degrees F.
Saturday Night is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Sunday at about 2 to 9 mph S.
The forecast from Aug 29 through Sep 4 stays mostly dry.
Forecast Details
- Last updated
- Aug 28, 2026 10:15 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 67. East southeast wind 0 to 3 mph.
Sunny, with a high near 94. South wind 2 to 9 mph.
Clear, with a low around 72. South wind around 5 mph.
Sunny, with a high near 96. South southwest wind around 8 mph.
Clear, with a low around 74. South wind 2 to 6 mph.
Sunny, with a high near 97. South southwest wind 2 to 7 mph.
Mostly clear, with a low around 76. South wind around 5 mph.
Sunny, with a high near 96. South southwest wind 2 to 8 mph.
Mostly clear, with a low around 76. South southwest wind 2 to 6 mph.
Sunny, with a high near 98. Southwest wind 2 to 7 mph.
Mostly clear, with a low around 75. South southwest wind around 3 mph.
Sunny, with a high near 97. Southwest wind 2 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Patchy Fog then Sunny
|
91°F |
0 to 5 mph
ESE
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
67°F |
0 to 3 mph
ESE
|
|
Sunday
Aug 30
|
Sunny
|
94°F |
2 to 9 mph
S
|
|
Sunday Night
Aug 30
|
Clear
|
72°F |
5 mph
S
|
|
Monday
Aug 31
|
Sunny
|
96°F |
8 mph
SSW
|
|
Monday Night
Aug 31
|
Clear
|
74°F |
2 to 6 mph
S
|
|
Tuesday
Sep 1
|
Sunny
|
97°F |
2 to 7 mph
SSW
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
76°F |
5 mph
S
|
|
Wednesday
Sep 2
|
Sunny
|
96°F |
2 to 8 mph
SSW
|
|
Wednesday Night
Sep 2
|
Mostly Clear
|
76°F |
2 to 6 mph
SSW
|
|
Thursday
Sep 3
|
Sunny
|
98°F |
2 to 7 mph
SW
|
|
Thursday Night
Sep 3
|
Mostly Clear
|
75°F |
3 mph
SSW
|
|
Friday
Sep 4
|
Sunny
|
97°F |
2 to 7 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harrisburg.
