St Johns Weather Forecast

    • 65
    • 85

    Rain Showers Likely

    • 59
    • 78

    Mostly Cloudy

    • 67
    • 83

    Rain Showers Likely

    • 61
    • 81

    Chance Rain Showers

    • 60
    • 78

    Chance Rain Showers

    • 60
    • 77

    Chance Rain Showers

Today 17 Sep Mercer

Becoming partly cloudy late. Showers likely with a chance of Thunderstorms this Morning, then Showers likely with a slight chance of Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this morning. Some Thunderstorms may produce heavy rainfall this afternoon. Highs in the mid 80s. West Winds around 5 Mph. Chance of rain 70 percent.

Tonight 17 Sep Mercer

Partly cloudy in the Evening, then becoming mostly cloudy. A chance of Showers with a slight chance of Thunderstorms. Muggy. Lows in the mid 60s. North Winds around 5 Mph. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Johns Temperature Statistics

September Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    74.1 °F

  • Highest 1 September, 2026

    93.2 °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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