Alton Weather Forecast

    • 66
    • 82

    Rain Showers

    • 66
    • 85

    Chance Thunderstorms

    • 60
    • 83

    Slight Chance Thunderstorms

    • 58
    • 79

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

    • 63
    • 83

    Partly Sunny

Today 31 May Jefferson

Patchy fog in the morning. Mostly cloudy with a chance of Showers and Thunderstorms in the Morning, then partly sunny with Showers and Thunderstorms likely in the afternoon. Highs in the mid 80s. Light and variable Winds, becoming northeast around 5 Mph in the afternoon. Chance of rain 70 percent.

Tonight 31 May Jefferson

Mostly cloudy. Patchy fog. Near steady temperature around 70. Light and variable Winds.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Alton Temperature Statistics

May Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 3 May, 2026

    41.6 °F

  • Average May

    71.4 °F

  • Highest 17 May, 2026

    90.6 °F

Climate (2021–Present)

Birmingham, Birmingham International Airport (6.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    55.5 °F

  • Average 2021–2026

    65.5 °F

  • Average High 2021–2026

    76 °F
Get WillyWeather+ to remove ads