The Grotto Weather Forecast

    • 30
    • 50

    Increasing Clouds

    • 44
    • 49

    Rain

    • 29
    • 53

    Chance Rain

    • 38
    • 46

    Mostly Cloudy

    • 29
    • 52

    Partly Sunny

    • 29
    • 42

    Partly Sunny

Today 17 Dec District of Columbia

Mostly sunny. Highs in the upper 40s. Southwest Winds around 5 Mph.

Tonight 17 Dec District of Columbia

Mostly cloudy in the Evening, then clearing. Lows around 30. Northwest Winds around 5 Mph in the Evening, becoming light and variable.

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The Grotto Temperature Statistics

December Temperature

Washington/Reagan National Airport, DC (3.1 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    34.2 °F

  • Highest 1 December, 2025

    46 °F

Climate (2020–Present)

Washington/Reagan National Airport, DC (3.1 miles)

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  • Average Low 2020–2025

    52.5 °F

  • Average 2020–2025

    60.3 °F

  • Average High 2020–2025

    69.1 °F
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