Alton, IN Weather Forecast
Local 7-day forecast
Areas Of Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Alton, IN in one place.
Areas of fog. Mostly cloudy, with a low around 69. Wind around 0 mph. New rainfall amounts less than a tenth of an inch possible.
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: Jul 26, 2026 2:50 AM EDT.
The active forecast window currently covers Jul 26 to Aug 1, 2026 for Alton, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 26 to Aug 1, 2026
- Latest sync
- Jul 26, 2026 2:50 AM EDT
- Forecast office
- LMK
- Source
- NOAA / NWS
Daily Outlook
This Week in Alton
Monday looks like the warmest upcoming period in Alton at 94 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 9 mph W.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 26, 2026 2:50 AM EDT
- Coverage
- 7 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
Areas of fog before 10am. Partly sunny, with a high near 89. Heat index values as high as 102. Northwest wind 0 to 3 mph.
Scattered rain showers between 2am and 5am, then isolated showers and thunderstorms. Partly cloudy, with a low around 71. Heat index values as high as 102. Northwest wind 0 to 3 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Isolated showers and thunderstorms before 2pm. Mostly sunny, with a high near 94. Heat index values as high as 109. South wind 0 to 7 mph. Chance of precipitation is 20%. New rainfall amounts between a tenth and quarter of an inch possible.
Scattered showers and thunderstorms between 8pm and 5am, then scattered showers and thunderstorms. Partly cloudy, with a low around 77. Southwest wind around 6 mph. Chance of precipitation is 30%.
Scattered showers and thunderstorms before 8am. Mostly sunny, with a high near 93. Chance of precipitation is 30%.
Partly cloudy, with a low around 68.
Sunny, with a high near 89.
Mostly clear, with a low around 65.
Sunny, with a high near 89.
Partly cloudy, with a low around 66.
Mostly sunny, with a high near 89.
A slight chance of rain showers between 8pm and 2am. Partly cloudy, with a low around 68. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 89.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 26
|
Areas Of Fog
|
69°F |
0 mph
|
|
Sunday
Jul 26
|
Areas Of Fog then Partly Sunny
|
89°F |
0 to 3 mph
NW
|
|
Sunday Night
Jul 26
|
Partly Cloudy then Isolated Showers And Thunderstorms
|
71°F |
0 to 3 mph
NW
|
|
Monday
Jul 27
|
Isolated Showers And Thunderstorms
|
94°F |
0 to 7 mph
S
|
|
Monday Night
Jul 27
|
Scattered Showers And Thunderstorms
|
77°F |
6 mph
SW
|
|
Tuesday
Jul 28
|
Scattered Showers And Thunderstorms then Mostly Sunny
|
93°F |
5 to 9 mph
W
|
|
Tuesday Night
Jul 28
|
Partly Cloudy
|
68°F |
3 to 9 mph
N
|
|
Wednesday
Jul 29
|
Sunny
|
89°F |
3 to 7 mph
N
|
|
Wednesday Night
Jul 29
|
Mostly Clear
|
65°F |
2 to 7 mph
N
|
|
Thursday
Jul 30
|
Sunny
|
89°F |
5 mph
NE
|
|
Thursday Night
Jul 30
|
Partly Cloudy
|
66°F |
1 to 5 mph
NE
|
|
Friday
Jul 31
|
Mostly Sunny
|
89°F |
3 mph
S
|
|
Friday Night
Jul 31
|
Slight Chance Rain Showers
|
68°F |
3 mph
N
|
|
Saturday
Aug 1
|
Slight Chance Showers And Thunderstorms
|
89°F |
1 to 5 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Alton.