Harristown, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harristown, IL in one place.
Sunny, with a high near 92. West southwest wind around 13 mph, with gusts as high as 18 mph.
Local Weather Overview
This forecast page for Harristown, 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 3:58 AM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Harristown, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 3:58 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Harristown
Tuesday looks like the warmest upcoming period in Harristown at 92 degrees F.
Friday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Friday at about 22 to 26 mph NNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 3:58 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
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 between 7pm and 1am, then showers and thunderstorms likely. Partly cloudy, with a low around 69. Southwest wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 80. West northwest wind around 7 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Showers and thunderstorms. Cloudy, with a low around 61. Northeast wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 77. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a low around 50. Chance of precipitation is 80%.
A slight chance of rain showers before 7am. Partly sunny, with a high near 61.
Mostly clear, with a low around 36.
Sunny, with a high near 60.
Clear, with a low around 36.
Sunny, with a high near 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
92°F |
13 mph
WSW
|
|
Tuesday Night
Oct 13
|
Slight Chance Showers And Thunderstorms
|
69°F |
7 mph
SW
|
|
Wednesday
Oct 14
|
Showers And Thunderstorms
|
80°F |
7 mph
WNW
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms
|
61°F |
8 mph
NE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
77°F |
8 to 12 mph
SSE
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms
|
50°F |
12 to 22 mph
WNW
|
|
Friday
Oct 16
|
Slight Chance Rain Showers then Partly Sunny
|
61°F |
22 to 26 mph
NNW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
36°F |
6 to 20 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
60°F |
6 mph
NE
|
|
Saturday Night
Oct 17
|
Clear
|
36°F |
5 mph
SE
|
|
Sunday
Oct 18
|
Sunny
|
67°F |
6 to 12 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harristown.