Swansea Weather Forecast

    • 10
    • 29

    Increasing Clouds

    • 7
    • 24

    Mostly Cloudy

    • 1
    • 18

    Partly Sunny

    • 1
    • 18

    Partly Sunny

    • 15
    • 26

    Slight Chance Snow

    • 19
    • 34

    Mostly Cloudy

Today 28 Jan St. Clair

Mostly sunny. Highs in the upper 20s. West Winds 5 to 10 Mph. Wind chill Values as low as 5 below this morning.

Tonight 28 Jan St. Clair

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 9 above. West Winds around 5 Mph, becoming north after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Swansea Temperature Statistics

January Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 24 January, 2026

    4.3 °F

  • Average January

    33.6 °F

  • Highest 6 January, 2026

    69.1 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

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

  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    57.4 °F

  • Average High 2021–2026

    67.6 °F
Get WillyWeather+ to remove ads