Fort Denison Weather Forecast

    • 18
    • 27

    Mostly sunny

    • 18
    • 31

    Sunny

    • 22
    • 34

    Sunny morning. Possible storm

    • 21
    • 30

    Shower or two. Possible storm

    • 21
    • 34

    Possible storm

    • 23
    • 31

    Shower or two

    • 20
    • 28

    Shower or two

Today 17 Dec Sydney

Mostly sunny. Winds northeasterly 20 to 30 km/h.

Sydney Enclosed Waters

Sydney Harbour, Pittwater and Botany Bay
Wind
Northeasterly about 10 knots increasing to 15 to 20 knots in the middle of the day.
Seas
Below 0.5 metres.
Weather
Mostly sunny.
Weather Situation
A high in the Bight is extending a ridge across Sydney Local Waters while heading eastwards. Easterly winds on Sydney Local Waters will turn north to northeasterly as the system moves east across southeast Australia and reaches the Tasman Sea today. Then, a cold front will brush along the coast, bringing a brief southerly change to Sydney Local Waters on Friday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Fort Denison Temperature Statistics View More

December Temperature

Sydney (Observatory Hill) (2km)

  • Lowest 2 December, 2025

    13.3 °C

  • Average December

    22 °C

  • Highest 5 December, 2025

    37.8 °C

Climate (2020–Present)

Sydney (Observatory Hill) (2km)

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  • Average Low 2020–2025

    14.7 °C

  • Average 2020–2025

    18.3 °C

  • Average High 2020–2025

    23.4 °C
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