St Johns Weather Forecast

    • 43
    • 69

    Becoming Sunny

    • 41
    • 69

    Mostly Sunny

    • 42
    • 68

    Mostly Sunny

    • 45
    • 72

    Partly Sunny

    • 46
    • 73

    Mostly Cloudy

    • 45
    • 68

    Mostly Cloudy

Today 22 Oct Mercer

Partly cloudy early this Morning, then clearing. Areas of fog this morning. Highs around 70. Light and variable Winds, becoming north around 5 Mph this afternoon.

Tonight 22 Oct Mercer

Clear. Lows in the lower 40s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Real-Time

St Johns Temperature Statistics

October Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 18 October, 2026

    35.6 °F

  • Average October

    60.5 °F

  • Highest 13 October, 2026

    87.8 °F

Climate (2021–2026)

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

    61.8 °F
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