Alton, IL Weather Forecast
Madison County, Illinois
Live radar, warnings and storm tracking for Alton, with free alerts the moment it counts.
The next few hours
Taller, warmer bars mean heavier rain. Dotted means no reading for that hour.
Hour by hour
Sunrise and sunset
Next five days, scored 0 to 100The first day or two use the HRRR and NBM cloud layers. Later days only have total cloud, so treat them as a rough guide.
Know when sunset at this place will be worth a photo
We score every sunrise and sunset here from the cloud, haze and smoke forecast, and let you know when one is likely to light up. Sunrise the evening before, sunset a few hours ahead.
Seven-day outlook
Free alerts for Alton
Every NWS warning, pushed to your phone, inbox or webhook the moment it is issued.
Alton, IL at a glance
Alton is home to about 25,006 people in Madison County, across 16 square miles. It ranks 88th by population of 441 places in Illinois with a forecast here. The nearest neighbour with its own forecast is East Alton, 3 miles away.
- County
- Madison County
- Population
- 25,006 2023 est.
- Land area
- 16 sq mi
- People per sq mi
- 1,596
- Forecast point
- 38.9039°N, 90.1512°W
How well can the network see Alton?
The nearest Doppler radar is KLSX (St. Louis, MO), to the WSW. Its lowest scan passes about 2,000 ft above Alton. That is about as close as US radar coverage gets: low-level rotation and gust fronts over Alton show up clearly. Alton is closer to its radar than 68% of US cities.
The closest weather station is KALN (Alton/St Louis Rgnl). Representative on most days, though a thunderstorm can hit one and miss the other.
Forecasts near Alton
- East Alton, IL3 mi
- Wood River, IL5 mi
- Godfrey, IL5 mi
- Bethalto, IL6 mi
- Black Jack, MO9 mi
- Bellefontaine Neighbors, MO11 mi
- Edwardsville, IL12 mi
- Florissant, MO12 mi
Elsewhere in Illinois
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