Harrisburg, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers 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 rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 79. East wind around 5 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: Apr 9, 2026 4:21 PM CDT.
The active forecast window currently covers Apr 11 to Apr 15, 2026 for Harrisburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 11 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 4:21 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Harrisburg
Tuesday looks like the warmest upcoming period in Harrisburg at 87 degrees F.
Saturday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Monday at about 14 to 17 mph SSW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 4:21 PM CDT
- Coverage
- 5 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. Partly cloudy, with a low around 60. Southeast wind around 6 mph. Chance of precipitation is 20%.
Partly sunny, with a high near 83. South southwest wind 6 to 15 mph, with gusts as high as 26 mph.
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South southwest wind around 14 mph, with gusts as high as 24 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.
A slight chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 69. South southwest wind around 13 mph, with gusts as high as 22 mph.
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. South southwest wind 12 to 17 mph, with gusts as high as 26 mph.
A slight chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South southwest wind around 13 mph, with gusts as high as 23 mph.
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 12 to 16 mph, with gusts as high as 25 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southwest wind 6 to 12 mph, with gusts as high as 20 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 11
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
79°F |
5 mph
E
|
|
Saturday Night
Apr 11
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
60°F |
6 mph
SE
|
|
Sunday
Apr 12
|
Partly Sunny
|
83°F |
6 to 15 mph
SSW
|
|
Sunday Night
Apr 12
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
66°F |
14 mph
SSW
|
|
Monday
Apr 13
|
Chance Showers And Thunderstorms
|
82°F |
14 to 17 mph
SSW
|
|
Monday Night
Apr 13
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
69°F |
13 mph
SSW
|
|
Tuesday
Apr 14
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
12 to 17 mph
SSW
|
|
Tuesday Night
Apr 14
|
Slight Chance Showers And Thunderstorms
|
67°F |
13 mph
SSW
|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms
|
84°F |
12 to 16 mph
SSW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
63°F |
6 to 12 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harrisburg.
