Portsmouth Weather Forecast

    • 61
    • 76

    Becoming Sunny

    • 53
    • 80

    Mostly Sunny

    • 52
    • 70

    Mostly Sunny

    • 54
    • 69

    Partly Sunny

    • 60
    • 72

    Partly Sunny

    • 63
    • 78

    Slight Chance Rain Showers

Today 18 Sep Newport

Partly sunny with patchy drizzle. Patchy fog. Highs in the mid 70s. North Winds 5 to 10 Mph, becoming northwest.

Tonight 18 Sep Newport

Clear. Lows in the lower 60s. Southwest Winds 5 to 10 Mph, becoming west after midnight.

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Portsmouth Temperature Statistics

September Temperature

Newport, Newport State Airport (5 miles)

  • Lowest 13 September, 2025

    50 °F

  • Average September

    64.1 °F

  • Highest 6 September, 2025

    77 °F

Climate (2020–Present)

Newport, Newport State Airport (5 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    59.8 °F
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