Three Mile Island Weather Forecast

    • 58
    • 62

    Rain

    • 56
    • 74

    Partly Sunny

    • 65
    • 80

    Mostly Sunny

    • 58
    • 81

    Partly Sunny

    • 54
    • 68

    Chance Rain Showers

    • 46
    • 71

    Chance Rain Showers

    • 36
    • 55

    Slight Chance Rain Showers

Today 11 Oct Dauphin

Sunny. Highs in the mid 50s.

Tonight 11 Oct Dauphin

Rain with a slight chance of Thunderstorms this Evening, then rain likely after midnight. Mild. Near steady temperature in the upper 50s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming north around 5 Mph after midnight. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Mile Island Temperature Statistics

October Temperature

Harrisburg, Harrisburg International Airport (3.7 miles)

  • Lowest 7 October, 2026

    43.6 °F

  • Average October

    62.8 °F

  • Highest 2 October, 2026

    84.7 °F

Climate (2021–2026)

Harrisburg, Harrisburg International Airport (3.7 miles)

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  • Average Low 2021–2026

    47.1 °F

  • Average 2021–2026

    55.9 °F

  • Average High 2021–2026

    65.1 °F
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