Delaware River - Port Penn Weather Forecast

    • 63
    • 82

    Decreasing Clouds

    • 63
    • 87

    Partly Sunny

    • 67
    • 88

    Mostly Sunny

    • 71
    • 93

    Mostly Sunny

    • 64
    • 96

    Chance Rain Showers

    • 55
    • 74

    Chance Rain Showers

    • 53
    • 68

    Chance Rain Showers

Today 16 May New Castle

Sunny. Much warmer with Highs in the lower 80s. Southwest Winds 10 to 15 Mph.

Tonight 16 May New Castle

Partly cloudy this Evening, then becoming mostly cloudy. A chance of Sprinkles. Not as cool with Lows in the lower 60s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Delaware River - Port Penn Temperature Statistics

May Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 12 May, 2026

    39.7 °F

  • Average May

    60.7 °F

  • Highest 5 May, 2026

    84.7 °F

Climate (2021–Present)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.3 °F

  • Average High 2021–2026

    66.6 °F
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