Piscataqua River - Four Tree Island Weather Forecast

    • 50
    • 61

    Rain

    • 48
    • 66

    Partly Sunny

    • 47
    • 62

    Mostly Cloudy

    • 47
    • 62

    Partly Sunny

    • 47
    • 62

    Chance Rain Showers

    • 48
    • 63

    Chance Rain Showers

Today 20 Sep Coastal Rockingham

Rain. Highs around 60. Light and variable Winds. Chance of rain near 100 percent.

Tonight 20 Sep Coastal Rockingham

Rain in the Evening, then a chance of Showers after midnight. Patchy fog. Lows around 50. Light and variable Winds. Chance of rain near 100 percent.

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Piscataqua River - Four Tree Island Temperature Statistics

September Temperature

Pease Air Force Base / Portsmouth (3.1 miles)

  • Lowest 15 September, 2026

    45.1 °F

  • Average September

    66 °F

  • Highest 10 September, 2026

    86.5 °F

Climate (2021–2026)

Pease Air Force Base / Portsmouth (3.1 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    59.2 °F
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