Portsmouth Weather Forecast

    • 36
    • 46

    Rain

    • 24
    • 55

    Rain

    • 29
    • 38

    Chance Rain

    • 19
    • 44

    Slight Chance Rain

    • 16
    • 28

    Partly Sunny

    • 25
    • 35

    Chance Rain/Snow

Today 18 Dec Coastal Rockingham

Mostly sunny. Highs in the mid 40s. Light and variable Winds.

Tonight 18 Dec Coastal Rockingham

Partly cloudy with a slight chance of rain in the Evening, then cloudy with rain likely after midnight. Lows in the mid 30s. Temperatures rising into the mid 40s after midnight. South Winds 10 to 15 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

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Portsmouth Temperature Statistics

December Temperature

Pease Air Force Base / Portsmouth (3.1 miles)

  • Lowest 5 December, 2025

    6.8 °F

  • Average December

    26.4 °F

  • Highest 10 December, 2025

    41.4 °F

Climate (2020–Present)

Pease Air Force Base / Portsmouth (3.1 miles)

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  • Average Low 2020–2025

    42.6 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    59.3 °F
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