Harrison, IL Weather Forecast
Local 7-day forecast
Partly Sunny then Slight Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Harrison, IL in one place.
A slight chance of rain showers after noon. Partly sunny, with a high near 82. East northeast wind around 2 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Harrison, 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 23, 2026 9:57 PM CDT.
The active forecast window currently covers Jul 24 to Jul 30, 2026 for Harrison, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 24 to Jul 30, 2026
- Latest sync
- Jul 23, 2026 9:57 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Harrison
Monday looks like the warmest upcoming period in Harrison at 99 degrees F.
Friday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Monday at about 5 to 9 mph SSW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 23, 2026 9:57 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
A chance of rain showers before 7pm, then a chance of showers and thunderstorms between 7pm and 9pm, then a slight chance of showers and thunderstorms between 9pm and 10pm, then showers and thunderstorms likely between 10pm and 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. East southeast wind around 2 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 89. South wind 2 to 6 mph. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72. South wind around 3 mph. Chance of precipitation is 20%.
Mostly sunny, with a high near 94. West wind around 2 mph.
Mostly clear, with a low around 74. South wind around 3 mph.
Sunny, with a high near 99. South southwest wind 5 to 9 mph.
Mostly clear, with a low around 78. Southwest wind around 8 mph.
Sunny, with a high near 97. West northwest wind 5 to 8 mph.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 74. Northeast wind 3 to 7 mph.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 93. Northeast wind 2 to 7 mph.
Partly cloudy, with a low around 71. East northeast wind 2 to 6 mph.
Mostly sunny, with a high near 92. South southeast wind 2 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 24
|
Partly Sunny then Slight Chance Rain Showers
|
82°F |
2 mph
ENE
|
|
Friday Night
Jul 24
|
Showers And Thunderstorms Likely
|
66°F |
2 mph
ESE
|
|
Saturday
Jul 25
|
Showers And Thunderstorms Likely
|
89°F |
2 to 6 mph
S
|
|
Saturday Night
Jul 25
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
3 mph
S
|
|
Sunday
Jul 26
|
Mostly Sunny
|
94°F |
2 mph
W
|
|
Sunday Night
Jul 26
|
Mostly Clear
|
74°F |
3 mph
S
|
|
Monday
Jul 27
|
Sunny
|
99°F |
5 to 9 mph
SSW
|
|
Monday Night
Jul 27
|
Mostly Clear
|
78°F |
8 mph
SW
|
|
Tuesday
Jul 28
|
Sunny
|
97°F |
5 to 8 mph
WNW
|
|
Tuesday Night
Jul 28
|
Partly Cloudy then Slight Chance Rain Showers
|
74°F |
3 to 7 mph
NE
|
|
Wednesday
Jul 29
|
Slight Chance Rain Showers then Mostly Sunny
|
93°F |
2 to 7 mph
NE
|
|
Wednesday Night
Jul 29
|
Partly Cloudy
|
71°F |
2 to 6 mph
ENE
|
|
Thursday
Jul 30
|
Mostly Sunny
|
92°F |
2 to 7 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harrison.