Portsmouth Weather Forecast

    • 45
    • 67

    Becoming Sunny

    • 49
    • 72

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

    • 58
    • 90

    Partly Sunny

    • 53
    • 75

    Mostly Cloudy

    • 51
    • 74

    Partly Sunny

Today 30 May Inner Portland Metro

Sunny. Highs in the upper 60s. Northwest wind 5 to 10 Mph.

Tonight 30 May Inner Portland Metro

Mostly clear. Lows in the mid 40s. Northwest wind 5 to 10 Mph.

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  • Temperature Real-Time

Portsmouth Temperature Statistics

May Temperature

Pearson Airfield (3.7 miles)

  • Lowest 17 May, 2026

    38.6 °F

  • Average May

    61.9 °F

  • Highest 3 May, 2026

    91.7 °F

Climate (2021–Present)

Pearson Airfield (3.7 miles)

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  • Average Low 2021–2026

    46.4 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    64.8 °F
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