St Johns Weather Forecast

    • 66
    • 81

    Rain Showers

    • 65
    • 81

    Rain Showers Likely

    • 69
    • 83

    Chance Thunderstorms

    • 67
    • 86

    Chance Thunderstorms

    • 62
    • 80

    Chance Rain Showers

    • 61
    • 79

    Partly Sunny

Today 13 Aug Mercer

Patchy fog in the morning. Mostly cloudy in the Morning, then partly cloudy with a chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the lower 80s. South Winds around 5 Mph, becoming northeast in the afternoon. Chance of rain 30 percent.

Tonight 13 Aug Mercer

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers with a chance of Thunderstorms after midnight. Lows in the mid 60s. East Winds around 5 Mph. Chance of rain 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Johns Temperature Statistics

August Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 4 August, 2026

    53.6 °F

  • Average August

    73 °F

  • Highest 8 August, 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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