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Weather Forecast and Conditions for Alton, IL

Heat Advisory issued July 20 at 8:23PM CDT until July 21 at 7:00PM CDT by NWS St Louis MO Read more
Air Quality Alert issued July 20 at 12:24PM CDT by NWS St Louis MO Read more
Thunderstorm
76°
Feels like 80°
Thunderstorm
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Winds: ENE 1.7 mph
Humidity: 85%
Pressure: 29.77 inHg
Visibility: 8 miles
UV Index: 0
Precip chance: 25%
Precip today: 0.05 in
Dew Point: 72° F
Sunrise: 5:51 AM
Sunset: 8:22 PM
Today: Partly sunny and humid
Tonight: Clouds breaking with a thunderstorm or two; warm and very humid; storms can bring flooding downpours and localized damaging wind gusts
Updated July 21, 12:57 AM
AirQuality 163 Unhealthy
Grass 2 Low
Mold 3250 Low
Ragweed 5 Low
Tree 7 Low
UVIndex 11 Extreme
Monday
07/20
Partly sunny
25%
94° / 75°
Tuesday
07/21
Partly sunny w/ t-storms
55%
92° / 65°
Wednesday
07/22
Mostly cloudy
1%
82° / 59°
Thursday
07/23
Intermittent clouds
20%
79° / 62°
Friday
07/24
Showers
63%
77° / 62°
Alton Riverfront
Alton Marina

Weather data provided by AccuWeather

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