St Johns Weather Forecast

    • 73
    • 93

    Mostly Sunny

    • 70
    • 92

    Areas Smoke

    • 72
    • 90

    Rain Showers Likely

    • 68
    • 89

    Rain Showers Likely

    • 63
    • 83

    Mostly Sunny

    • 68
    • 85

    Chance Rain Showers

    • 62
    • 84

    Chance Rain Showers

Today 15 Jul Mercer

Sunny. Highs in the lower 90s. West Winds around 5 Mph. Heat index Values up to 102.

Tonight 15 Jul Mercer

Mostly clear. Lows in the lower 70s. West Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Johns Temperature Statistics

July Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 13 July, 2026

    59 °F

  • Average July

    76.6 °F

  • Highest 3 July, 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

    52.5 °F

  • Average High 2021–2026

    61.8 °F
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