Three Mile Island Weather Forecast

    • 63
    • 83

    Rain Showers

    • 58
    • 81

    Slight Chance Rain Showers

    • 61
    • 84

    Partly Sunny

    • 65
    • 88

    Rain Showers Likely

    • 64
    • 88

    Chance Thunderstorms

    • 66
    • 87

    Chance Rain Showers

Today 22 Jun Dauphin

Showers likely with a slight chance of Thunderstorms in the Morning, then Showers with a chance of Thunderstorms in the afternoon. Highs in the upper 70s. East Winds 5 to 10 Mph, becoming south in the afternoon. Chance of rain near 100 percent.

Tonight 22 Jun Dauphin

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Patchy fog after midnight. Humid with Lows in the lower 60s. South Winds around 5 Mph, becoming northwest after midnight. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Mile Island Temperature Statistics

June Temperature

Harrisburg, Harrisburg International Airport (3.7 miles)

  • Lowest 2 June, 2026

    53.7 °F

  • Average June

    74.1 °F

  • Highest 12 June, 2026

    94.6 °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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