Harrisburg, 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 Harrisburg, IL in one place.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 87. Northeast wind 2 to 8 mph. Chance of precipitation is 20%.
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: Jul 13, 2026 12:55 AM CDT.
The active forecast window currently covers Jul 14 to Jul 19, 2026 for Harrisburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 14 to Jul 19, 2026
- Latest sync
- Jul 13, 2026 12:55 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Harrisburg
Thursday looks like the warmest upcoming period in Harrisburg at 91 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 69 degrees F.
The strongest winds are forecast for Tuesday at about 2 to 8 mph NE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 13, 2026 12:55 AM CDT
- Coverage
- 6 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
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 69. Northeast wind 0 to 3 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 89. Northeast wind 0 to 3 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71. North northeast wind around 1 mph.
Sunny, with a high near 91. West southwest wind around 2 mph.
Mostly clear, with a low around 72. Southwest wind around 1 mph.
Sunny, with a high near 91. West southwest wind 1 to 6 mph.
Mostly clear, with a low around 72. South southwest wind around 5 mph.
Sunny, with a high near 91. Southwest wind 3 to 7 mph.
Mostly clear, with a low around 72. Southwest wind around 5 mph.
Sunny, with a high near 91. West southwest wind 3 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jul 14
|
Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
2 to 8 mph
NE
|
|
Tuesday Night
Jul 14
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
69°F |
0 to 3 mph
NE
|
|
Wednesday
Jul 15
|
Sunny then Chance Showers And Thunderstorms
|
89°F |
0 to 3 mph
NE
|
|
Wednesday Night
Jul 15
|
Chance Showers And Thunderstorms then Mostly Clear
|
71°F |
1 mph
NNE
|
|
Thursday
Jul 16
|
Sunny
|
91°F |
2 mph
WSW
|
|
Thursday Night
Jul 16
|
Mostly Clear
|
72°F |
1 mph
SW
|
|
Friday
Jul 17
|
Sunny
|
91°F |
1 to 6 mph
WSW
|
|
Friday Night
Jul 17
|
Mostly Clear
|
72°F |
5 mph
SSW
|
|
Saturday
Jul 18
|
Sunny
|
91°F |
3 to 7 mph
SW
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
72°F |
5 mph
SW
|
|
Sunday
Jul 19
|
Sunny
|
91°F |
3 to 7 mph
WSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harrisburg.
