Hampton Harbor - Knowles Island Weather Forecast

    • 60
    • 75

    Isolated Thunderstorms

    • 47
    • 75

    Mostly Sunny

    • 45
    • 66

    Mostly Sunny

    • 51
    • 68

    Mostly Sunny

    • 57
    • 74

    Mostly Sunny

    • 60
    • 78

    Partly Sunny

Today 18 Sep Coastal Rockingham

Mostly cloudy with scattered Showers with isolated Thunderstorms in the Morning, then mostly sunny in the afternoon. Highs in the upper 70s. Light and variable Winds. Chance of rain 30 percent.

Tonight 18 Sep Coastal Rockingham

Cloudy with scattered Showers with isolated Thunderstorms. Patchy fog. Lows in the mid 50s. Light and variable Winds. Chance of rain 50 percent.

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Hampton Harbor - Knowles Island Temperature Statistics

September Temperature

Pease Air Force Base / Portsmouth (13 miles)

  • Lowest 9 September, 2025

    47.3 °F

  • Average September

    64.1 °F

  • Highest 6 September, 2025

    82.6 °F

Climate (2020–Present)

Pease Air Force Base / Portsmouth (13 miles)

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  • Average Low 2020–2025

    42.6 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    59.4 °F
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