Swansea Weather Forecast

    • 44
    • 66

    Partly Sunny

    • 48
    • 66

    Partly Sunny

    • 41
    • 61

    Partly Sunny

    • 43
    • 62

    Mostly Sunny

    • 50
    • 71

    Slight Chance Thunderstorms

    • 51
    • 73

    Slight Chance Thunderstorms

Today 29 Apr St. Clair

Mostly sunny. Highs in the mid 60s. Northwest Winds 10 to 15 Mph.

Tonight 29 Apr St. Clair

Partly cloudy in the Evening, then clearing. Lows in the lower 40s. North Winds 5 to 10 Mph.

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Swansea Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 6 April, 2026

    38.8 °F

  • Average April

    62.8 °F

  • Highest 17 April, 2026

    85.3 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    68 °F
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