Collinsville Weather Forecast

    • 53
    • 67

    Slight Chance Rain Showers

    • 58
    • 72

    Mostly Cloudy

    • 59
    • 72

    Rain Showers

    • 61
    • 80

    Chance Rain Showers

    • 63
    • 81

    Chance Thunderstorms

    • 66
    • 82

    Chance Thunderstorms

Today 20 May Madison

Mostly cloudy. A slight chance of Showers this morning. Cooler with Highs in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 20 May Madison

Mostly cloudy. Lows in the lower 50s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

Collinsville Temperature Statistics

May Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 7 May, 2026

    40.1 °F

  • Average May

    63.5 °F

  • Highest 17 May, 2026

    86.5 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    68.1 °F
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