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Alton, IL Weather Forecast

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Alton, IL Weather Forecast

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Alton IL weather - Mostly Clear - 86°F
Mostly Clear
86°F
Updated 12:35 pm
Feels Like 102°F
Humidity 55%
Wind WSW 8 mph
Barometer  29.93 in
Dew Point 68°F
Alton IL weather - Mostly Clear - 30°C
Mostly Clear
30°C
Updated 12:35 pm
Feels Like 39°C
Humidity 55%
Wind WSW 13 km/h
Barometer  101.4 kPa
Dew Point 20°C
WX Settings

Alton Weather Forecast

THIS AFTERNOON TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT
Alton, IL Weather - This Afternoon Sunny Alton, IL Weather - Tonight Partly Cloudy Alton, IL Weather - Sunday Chance Of T-Storm Alton, IL Weather - Sunday Night Chance Of T-Storm Alton, IL Weather - Monday Chance Of T-Storm Alton, IL Weather - Monday Night Mostly Clear Alton, IL Weather - Tuesday Mostly Clear Alton, IL Weather - Tuesday Night Partly Cloudy Alton, IL Weather - Wednesday Chance Of T-Storm Alton, IL Weather - Wednesday Night Chance Of T-Storm Alton, IL Weather - Thursday Chance Of T-Storm Alton, IL Weather - Thursday Night Chance Of T-Storm
Sunny Partly Cloudy Chance of T-Storm Chance of T-Storm Chance of T-Storm Mostly Clear Mostly Clear Partly Cloudy Chance of T-Storm Chance of T-Storm Chance of T-Storm Chance of T-Storm
Hi: 91°FHi: 33°C
 Lo: 70°FLo: 21°C Hi: 89°FHi: 32°C
 Lo: 65°FLo: 18°C Hi: 89°FHi: 32°C
 Hi: 95°FHi: 35°C
Lo: 70°FLo: 21°C		 Hi: 95°FHi: 35°C
Lo: 70°FLo: 21°C		 Lo: 71°FLo: 22°C Hi: 95°FHi: 35°C
 Lo: 71°FLo: 22°C Hi: 89°FHi: 32°C
 Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C
POP: 20% POP: 20% POP: 30% POP: 20% POP: 20% POP: 40% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 1103 AM CDT Sat Sep 12 2026 Alton, IL Weather - WeatherWorld.com

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Issued: 1215 PM CDT Sat Sep 12 2026

Key Messages

  • There is a chance (20-30%) for showers and thunderstorms across central and northeast Missouri into west central Illinois late this afternoon and tonight. The chance for rain spreads southeast across the area on Sunday.
  • Temperatures will remain above normal for most of the area into next week with a chance for rain continuing, mainly across northern Missouri into central Illinois.

Aviation

/18Z TAFS THROUGH 00Z MONDAY/... Issued at 1210 PM CDT Sat Sep 12 2026

A weak front is moving thro...