Alton Weather Forecast
- 69
- 90
Chance Thunderstorms
- 67
- 86
Mostly Sunny
- 69
- 89
Mostly Sunny
- 73
- 92
Mostly Sunny
- 75
- 94
Partly Sunny
- 76
- 95
Partly Sunny
Today 30 Jun Madison
Partly sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds around 5 Mph. Chance of rain 50 percent.
Tonight 30 Jun Madison
Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the upper 60s. Northwest Winds around 5 Mph. Chance of rain 50 percent.
Alton Temperature Statistics
June Temperature
St. Louis Regional Airport (8.1 miles)
Lowest 2 June, 2025
55.6 °FAverage June
73 °FHighest 25 June, 2025
95 °F
Climate (2020–Present)
St. Louis Regional Airport (8.1 miles)
Average Low 2020–2025
46 °FAverage 2020–2025
53.8 °FAverage High 2020–2025
65.9 °F