Alton Weather Today — Illinois, United States
Current temperature, rain chance, humidity, wind and air quality in Alton, plus an hourly and 3-day forecast. Updated through the day.
10:57
Fri, 18 Sep 2026
📍 Illinois, United States
Alton??
27
°C
Sunny
Feels 30°C · 81°F
💧 70% Humidity
💨 ↘ 3.6 km/h SE
👁 10 km Visibility
🌧 0 mm Precip
☁ 1% Cloud
☀️ UV Moderate
🌿 AQI Good
☀️ UV Index
3
Moderate
🔵 Pressure
1020
hPa · 30.13 in
💨 Wind
3.6
km/h · Gust 4 km/h
↘ SE
💧 Humidity
70%
Dew point 21.4°C
👁 Visibility
10
km · 6 miles
🌡 Heat Index
29.9°
Wind chill 27.4°C
🌿 Air Quality
Good
US EPA Index: 1
🌅
Sunrise
06:44 AM
🌇
Sunset
07:04 PM
📅 3-Day Forecast
Friday
18 Sep 2026
Sunny
35°
/
24°
💧68%
🌧0.79mm
💨20
☀️UV 7.1
Saturday
19 Sep 2026
Overcast
32°
/
24°
💧58%
🌧0.75mm
💨16
☀️UV 7
Sunday
20 Sep 2026
Overcast
35°
/
23°
💧50%
🌧1.85mm
💨20
☀️UV 5.6
🏙 More Cities in Illinois
🌤
Abingdon
View weather →
🌤
Adams County
View weather →
🌤
Addison
View weather →
🌤
Albany Park
View weather →
🌤
Albers
View weather →
🌤
Albion
View weather →
🌤
Aledo
View weather →
🌤
Alexander
View weather →
🌤
Algonquin
View weather →
🌤
Alorton
View weather →
🌤
Alsip
View weather →
🌤
Altamont
View weather →