St Johns Weather Forecast

    • 41
    • 62

    Partly Sunny

    • 43
    • 65

    Partly Sunny

    • 57
    • 71

    Chance Rain Showers

    • 62
    • 85

    Chance Thunderstorms

    • 67
    • 88

    Chance Rain Showers

Today 13 May Mercer

Partly cloudy. Highs in the lower 60s. Northwest Winds 15 to 20 Mph.

Tonight 13 May Mercer

Partly cloudy in the Evening, then clearing. Cooler with Lows in the lower 40s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph, Diminishing to 5 to 10 Mph with Gusts up to 20 Mph after midnight.

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St Johns Temperature Statistics

May Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    52.7 °F

  • Highest 4 May, 2026

    73.4 °F

Climate (2021–Present)

Versailles Darke County Airport (14.3 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    61.7 °F
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