Alton, IN Weather Forecast
Local 7-day forecast
Areas Of Fog then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Alton, IN in one place.
Areas of fog before 10am. Sunny, with a high near 73. Northeast wind 0 to 5 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: Oct 21, 2026 9:07 AM EDT.
The active forecast window currently covers Oct 22 to Oct 27, 2026 for Alton, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 22 to Oct 27, 2026
- Latest sync
- Oct 21, 2026 9:07 AM EDT
- Forecast office
- LMK
- Source
- NOAA / NWS
Daily Outlook
This Week in Alton
Saturday looks like the warmest upcoming period in Alton at 74 degrees F.
Thursday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Thursday at about 0 to 5 mph NE.
The forecast from Oct 22 through Oct 27 stays mostly dry.
Forecast Details
- Last updated
- Oct 21, 2026 9:07 AM 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
Patchy fog after midnight. Clear, with a low around 40. Northeast wind 0 to 3 mph.
Patchy fog before 7am. Sunny, with a high near 71. East wind 1 to 5 mph.
Clear, with a low around 40.
Sunny, with a high near 74.
Mostly clear, with a low around 42.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 43.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 45.
Partly sunny, with a high near 71.
Mostly cloudy, with a low around 43.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 22
|
Areas Of Fog then Sunny
|
73°F |
0 to 5 mph
NE
|
|
Thursday Night
Oct 22
|
Clear then Patchy Fog
|
40°F |
0 to 3 mph
NE
|
|
Friday
Oct 23
|
Patchy Fog then Sunny
|
71°F |
1 to 5 mph
E
|
|
Friday Night
Oct 23
|
Clear
|
40°F |
3 mph
E
|
|
Saturday
Oct 24
|
Sunny
|
74°F |
3 mph
SE
|
|
Saturday Night
Oct 24
|
Mostly Clear
|
42°F |
1 mph
E
|
|
Sunday
Oct 25
|
Mostly Sunny
|
74°F |
2 mph
SW
|
|
Sunday Night
Oct 25
|
Partly Cloudy
|
43°F |
1 mph
NW
|
|
Monday
Oct 26
|
Mostly Sunny
|
74°F |
2 mph
W
|
|
Monday Night
Oct 26
|
Partly Cloudy
|
45°F |
1 mph
NW
|
|
Tuesday
Oct 27
|
Partly Sunny
|
71°F |
0 to 3 mph
NE
|
|
Tuesday Night
Oct 27
|
Mostly Cloudy
|
43°F |
3 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Alton.