St Johns Weather Forecast

    • 45
    • 78

    Chance Rain Showers

    • 45
    • 65

    Partly Sunny

    • 49
    • 65

    Cloudy

    • 50
    • 68

    Chance Rain

    • 53
    • 70

    Chance Rain

    • 54
    • 71

    Chance Rain

Today 29 Oct Mercer

Mostly sunny. Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 29 Oct Mercer

Partly cloudy with a chance of Showers in the Evening, then mostly clear after midnight. Lows in the mid 40s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northwest after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • 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

    59 °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

    52.6 °F

  • Average High 2021–2026

    61.8 °F
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