Dee Why Beach Weather Forecast

    • 22
    • 27

    Mostly clear

    • 22
    • 34

    Sunny morning. Possible storm

    • 23
    • 28

    Shower or two

    • 20
    • 28

    Possible shower

    • 19
    • 27

    Partly cloudy

    • 20
    • 23

    Shower or two

    • 18
    • 23

    Cloudy

Today 20 Dec Sydney

Mostly clear. Slight chance of a shower. The chance of a thunderstorm. Winds east to northeasterly 15 to 20 km/h becoming light in the evening.

Sydney Coastal Waters

Broken Bay to Port Hacking
Wind
Northeasterly 10 to 15 knots.
Seas
Below 1 metre.
1st Swell
Northeasterly below 1 metre.
Weather
Partly cloudy. The chance of a thunderstorm.
Weather Situation
A high in the Tasman Sea is directing northerly winds over central and northern Coastal Waters while a weak coastal trough brings southerly winds to the remainder. A cold front will bring a fresh to strong southerly change to the southern half on Monday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dee Why Beach Temperature Statistics View More

December Temperature

Terrey Hills (9km)

  • Lowest 3 December, 2025

    11.3 °C

  • Average December

    21.4 °C

  • Highest 6 December, 2025

    39.9 °C

Climate (2020–Present)

Terrey Hills (9km)

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  • Average Low 2020–2025

    13.4 °C

  • Average 2020–2025

    16.9 °C

  • Average High 2020–2025

    21.8 °C
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