Harrisburg, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harrisburg, IL in one place.
Sunny, with a high near 91. Southwest wind 6 to 12 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: Oct 12, 2026 1:51 PM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Harrisburg, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 1:51 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Harrisburg
Tuesday looks like the warmest upcoming period in Harrisburg at 91 degrees F.
Saturday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Friday at about 15 to 21 mph NNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 1:51 PM 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 rain showers between 1am and 4am, then a slight chance of showers and thunderstorms. Mostly clear, with a low around 71. South southwest wind around 7 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am, then showers and thunderstorms. Partly sunny, with a high near 86. Southwest wind 5 to 8 mph. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a low around 66. North wind 0 to 3 mph. Chance of precipitation is 80%.
Showers and thunderstorms likely. Partly sunny, with a high near 85. Southwest wind 0 to 12 mph.
A chance of showers and thunderstorms. Partly cloudy, with a low around 56. West northwest wind 7 to 15 mph, with gusts as high as 24 mph.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 66. North northwest wind 15 to 21 mph, with gusts as high as 30 mph.
Mostly clear, with a low around 38. North wind 9 to 17 mph, with gusts as high as 28 mph.
Sunny, with a high near 61. North northeast wind 6 to 10 mph.
Clear, with a low around 36. Northeast wind 0 to 5 mph.
Sunny, with a high near 69. South southeast wind 1 to 6 mph.
Mostly clear, with a low around 43. South southeast wind around 3 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
91°F |
6 to 12 mph
SW
|
|
Tuesday Night
Oct 13
|
Mostly Clear then Slight Chance Showers And Thunderstorms
|
71°F |
7 mph
SSW
|
|
Wednesday
Oct 14
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
|
86°F |
5 to 8 mph
SW
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms
|
66°F |
0 to 3 mph
N
|
|
Thursday
Oct 15
|
Showers And Thunderstorms Likely
|
85°F |
0 to 12 mph
SW
|
|
Thursday Night
Oct 15
|
Chance Showers And Thunderstorms
|
56°F |
7 to 15 mph
WNW
|
|
Friday
Oct 16
|
Chance Showers And Thunderstorms then Mostly Sunny
|
66°F |
15 to 21 mph
NNW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
38°F |
9 to 17 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
61°F |
6 to 10 mph
NNE
|
|
Saturday Night
Oct 17
|
Clear
|
36°F |
0 to 5 mph
NE
|
|
Sunday
Oct 18
|
Sunny
|
69°F |
1 to 6 mph
SSE
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
43°F |
3 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harrisburg.
