St Johns Weather Forecast

    • 59
    • 76

    Rain Showers

    • 50
    • 76

    Mostly Sunny

    • 56
    • 77

    Mostly Sunny

    • 50
    • 76

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 54
    • 75

    Mostly Sunny

Today 27 May Mercer

Mostly cloudy. Showers likely with a slight chance of Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the upper 70s. Light and variable Winds, becoming east around 5 Mph this late morning and afternoon. Chance of rain 70 percent.

Tonight 27 May Mercer

Partly cloudy in the Evening, then clearing. Lows in the upper 50s. South Winds around 5 Mph, becoming northeast 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

    58 °F

  • Highest 18 May, 2026

    86 °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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