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Weather Forecast and Conditions for Alton, IL

Heat Advisory issued September 1 at 3:22AM CDT until September 4 at 8:00PM CDT by NWS St Louis MO Read more
Sunny
76°
Feels like 84°
Sunny
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Winds: ENE 1.9 mph
Humidity: 84%
Pressure: 30.05 inHg
Visibility: 10 miles
UV Index: 1
Precip chance: 1%
Precip today: 0 in
Dew Point: 71° F
Sunrise: 6:29 AM
Sunset: 7:31 PM
Today: Sweltering heat with abundant sunshine; caution advised if outside for extended periods of time
Tonight: Clear, warm and humid
Updated September 1, 7:27 AM
AirQuality 75 Moderate
Grass 2 Low
Mold 3250 Low
Ragweed 575 Very High
Tree 7 Low
UVIndex 7 High
Tuesday
09/01
Hot
1%
100° / 73°
Wednesday
09/02
Hot
8%
99° / 72°
Thursday
09/03
Hot
8%
99° / 72°
Friday
09/04
Hot
9%
97° / 72°
Saturday
09/05
Hot
25%
96° / 71°
Alton Riverfront
Alton Marina

Weather data provided by AccuWeather