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Alton Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Showers Likely | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Showers | Showers | Partly Sunny | Partly Cloudy | Partly Sunny | Mostly Clear |
| Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 59°FHi: 15°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C |
| POP: 70% | POP: 70% | POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 801 AM EDT Thu Sep 17 2026 
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Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 640 AM EDT Thu Sep 17 2026
Key Messages
1. At least a couple chances for rain are expected through the weekend. While neither may impact the entire area, some beneficial rainfall is possible.
2. Cool conditions will arrive on Friday and persist through much of next week. Frost is possible some nights, especially across valley locations.
Discussion
... KEY MESSAGE 1 DESCRIPTION...
As the boundary layer continues to moisten with of a frontal wave, I expect that cloud cover as well as marine fog and stratus will continue to expan...