Great Bay - Nannie Island Weather Forecast

    • 51
    • 63

    Gradual Clearing

    • 51
    • 71

    Becoming Sunny

    • 49
    • 69

    Mostly Sunny

    • 50
    • 68

    Partly Sunny

    • 50
    • 77

    Mostly Sunny

    • 47
    • 69

    Mostly Sunny

    • 51
    • 69

    Partly Sunny

Today 7 Sep Coastal Rockingham

Showers likely. Highs in the lower 60s. Light and variable Winds. Chance of rain 70 percent.

Tonight 7 Sep Coastal Rockingham

Mostly cloudy with isolated Showers this Evening, then partly cloudy after midnight. Lows around 50. Light and variable Winds. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Bay - Nannie Island Temperature Statistics

September Temperature

Pease Air Force Base / Portsmouth (2.5 miles)

  • Lowest 4 September, 2025

    53.2 °F

  • Average September

    66.8 °F

  • Highest 2 September, 2025

    78.3 °F

Climate (2020–Present)

Pease Air Force Base / Portsmouth (2.5 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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