Arnold, IL Weather Forecast
Local 7-day forecast
Chance Rain Showers then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Arnold, IL in one place.
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then a slight chance of showers and thunderstorms. Mostly cloudy. High near 77, with temperatures falling to around 75 in the afternoon. West wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Arnold, 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: Sep 15, 2026 12:52 PM CDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Arnold, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 12:52 PM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Arnold
Saturday looks like the warmest upcoming period in Arnold at 81 degrees F.
Monday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Friday at about 5 to 10 mph E.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 12:52 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
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. Mostly cloudy. Low around 58, with temperatures rising to around 60 overnight. North wind around 5 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Mostly cloudy. High near 72, with temperatures falling to around 70 in the afternoon. Northeast wind around 5 mph. Chance of precipitation is 30%.
A slight chance of rain showers before 7pm, then a chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers and thunderstorms. Mostly cloudy, with a low around 63. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms before 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 40%.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Showers and thunderstorms likely. Partly sunny, with a high near 81. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 73. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 52.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Sep 15
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
77°F |
5 mph
W
|
|
Tonight
Sep 15
|
Slight Chance Showers And Thunderstorms
|
58°F |
5 mph
N
|
|
Wednesday
Sep 16
|
Chance Showers And Thunderstorms
|
72°F |
5 mph
NE
|
|
Wednesday Night
Sep 16
|
Chance Showers And Thunderstorms
|
63°F |
5 mph
E
|
|
Thursday
Sep 17
|
Showers And Thunderstorms
|
79°F |
5 mph
NE
|
|
Thursday Night
Sep 17
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
62°F |
5 mph
NE
|
|
Friday
Sep 18
|
Showers And Thunderstorms Likely
|
78°F |
5 to 10 mph
E
|
|
Friday Night
Sep 18
|
Chance Showers And Thunderstorms
|
64°F |
10 mph
SE
|
|
Saturday
Sep 19
|
Showers And Thunderstorms Likely
|
81°F |
10 mph
SW
|
|
Saturday Night
Sep 19
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
60°F |
5 to 10 mph
NW
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
73°F |
5 to 10 mph
NE
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
54°F |
5 to 10 mph
NE
|
|
Monday
Sep 21
|
Mostly Sunny
|
72°F |
5 to 10 mph
NE
|
|
Monday Night
Sep 21
|
Partly Cloudy
|
52°F |
5 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Arnold.