Alton, IN Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Alton, IN in one place.
Sunny, with a high near 80. West wind 3 to 8 mph.
Local Weather Overview
This forecast page for Alton, IN 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 21, 2026 5:42 PM EDT.
The active forecast window currently covers Apr 22 to Apr 27, 2026 for Alton, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 22 to Apr 27, 2026
- Latest sync
- Apr 21, 2026 5:42 PM EDT
- Forecast office
- LMK
- Source
- NOAA / NWS
Daily Outlook
This Week in Alton
Thursday looks like the warmest upcoming period in Alton at 83 degrees F.
Saturday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Monday at about 5 to 9 mph SE.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 21, 2026 5:42 PM EDT
- Coverage
- 6 days
- Time zone
- America/Indiana/Marengo
- Forecast office
- LMK
- Radar station
- KLVX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 54. Southwest wind 1 to 6 mph.
Sunny, with a high near 83. South wind 1 to 7 mph.
Mostly clear, with a low around 61.
A chance of rain showers between 8am and 2pm, then showers and thunderstorms likely. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 80%.
Showers and thunderstorms likely. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 53. Chance of precipitation is 40%.
A slight chance of rain showers after 8am. Mostly sunny, with a high near 79. Chance of precipitation is 20%.
A slight chance of rain showers. Partly cloudy, with a low around 57. Chance of precipitation is 20%.
A chance of rain showers before 2pm, then showers and thunderstorms likely. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 58.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Apr 22
|
Sunny
|
80°F |
3 to 8 mph
W
|
|
Wednesday Night
Apr 22
|
Mostly Clear
|
54°F |
1 to 6 mph
SW
|
|
Thursday
Apr 23
|
Sunny
|
83°F |
1 to 7 mph
S
|
|
Thursday Night
Apr 23
|
Mostly Clear
|
61°F |
2 to 6 mph
S
|
|
Friday
Apr 24
|
Showers And Thunderstorms Likely
|
80°F |
2 to 7 mph
S
|
|
Friday Night
Apr 24
|
Showers And Thunderstorms
|
59°F |
1 to 6 mph
SW
|
|
Saturday
Apr 25
|
Showers And Thunderstorms Likely
|
78°F |
1 to 5 mph
N
|
|
Saturday Night
Apr 25
|
Chance Showers And Thunderstorms then Partly Cloudy
|
53°F |
3 mph
N
|
|
Sunday
Apr 26
|
Slight Chance Rain Showers
|
79°F |
5 mph
NE
|
|
Sunday Night
Apr 26
|
Slight Chance Rain Showers
|
57°F |
5 mph
E
|
|
Monday
Apr 27
|
Showers And Thunderstorms Likely
|
79°F |
5 to 9 mph
SE
|
|
Monday Night
Apr 27
|
Showers And Thunderstorms Likely
|
58°F |
5 to 9 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Alton.