City of Alton Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for City of Alton in one place.
A chance of showers and thunderstorms before 10am. Partly sunny, with a high near 97. Heat index values as high as 105. Southeast wind around 5 mph. Chance of precipitation is 40%.
Local Weather Overview
This forecast page for City of Alton 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 4:21 AM CDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for City of Alton.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 4:21 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in City of Alton
Thursday looks like the warmest upcoming period in City of Alton at 98 degrees F.
Sunday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Sunday Night at about 7 to 13 mph N.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 4:21 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 75. South wind around 5 mph.
Sunny, with a high near 98.
Partly cloudy, with a low around 73.
Sunny, with a high near 95.
Mostly clear, with a low around 72.
Mostly sunny, with a high near 95.
A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 70. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms. Partly sunny, with a high near 79. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Chance Showers And Thunderstorms then Partly Sunny
|
97°F |
5 mph
SE
|
|
Wednesday Night
Sep 16
|
Partly Cloudy
|
75°F |
5 mph
S
|
|
Thursday
Sep 17
|
Sunny
|
98°F |
3 to 7 mph
W
|
|
Thursday Night
Sep 17
|
Partly Cloudy
|
73°F |
3 mph
NE
|
|
Friday
Sep 18
|
Sunny
|
95°F |
6 mph
SE
|
|
Friday Night
Sep 18
|
Mostly Clear
|
72°F |
7 mph
SE
|
|
Saturday
Sep 19
|
Mostly Sunny
|
95°F |
7 to 12 mph
SW
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
70°F |
8 mph
SW
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
85°F |
6 to 12 mph
NW
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
62°F |
7 to 13 mph
N
|
|
Monday
Sep 21
|
Slight Chance Showers And Thunderstorms
|
79°F |
8 to 13 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around City of Alton.