Gaithersburg Weather Forecast

    • 22
    • 46

    Becoming Sunny

    • 32
    • 41

    Chance Rain/Snow

    • 36
    • 51

    Mostly Cloudy

    • 35
    • 47

    Chance Rain

    • 44
    • 51

    Slight Chance Rain

    • 40
    • 60

    Mostly Cloudy

Today 21 Dec Central and Southeast Montgomery

Mostly sunny. Highs in the upper 40s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 21 Dec Central and Southeast Montgomery

Mostly clear. Lows in the lower 20s. Northwest Winds 5 to 10 Mph. Gusts up to 25 Mph in the evening.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Gaithersburg Temperature Statistics

December Temperature

Gaithersburg - Montgomery County Airport (2.5 miles)

  • Lowest 16 December, 2025

    10.9 °F

  • Average December

    31.9 °F

  • Highest 18 December, 2025

    55 °F

Climate (2020–Present)

Gaithersburg - Montgomery County Airport (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    56 °F

  • Average High 2020–2025

    65.9 °F
Get WillyWeather+ to remove ads