Fort Denison Weather Forecast

    • 23
    • 39

    Partly cloudy

    • 19
    • 26

    Possible shower

    • 17
    • 26

    Cloudy

    • 19
    • 30

    Mostly sunny

    • 19
    • 25

    Shower or two

    • 19
    • 23

    Shower or two

    • 17
    • 24

    Shower or two

Today 6 Dec Sydney

Partly cloudy. Slight chance of a shower. The chance of smoke haze. The chance of a thunderstorm in the afternoon and early evening, possibly severe with damaging winds. Winds north to northwesterly 20 to 30 km/h tending west to northwesterly 15 to 20 km/h in the late evening.

Extreme Fire Danger Rating

Take action now to protect life and property

Sydney Enclosed Waters

Sydney Harbour, Pittwater and Botany Bay
Wind
Northwesterly 10 to 15 knots tending northerly 15 to 25 knots in the middle of the day then turning west to northwesterly below 10 knots in the late evening. Winds may reach up to 30 knots at times.
Seas
Below 0.5 metres.
Weather
Partly cloudy. The chance of a thunderstorm in the afternoon and early evening.
Weather Situation
A high pressure system lies over the Tasman Sea, extending a ridge to the north. Northerly winds ahead of a cold front crossing Sydney Waters early Sunday, bringing a fresh to strong southerly wind change in its wake.
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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

    21.2 °C

  • Highest 4 December, 2025

    29.6 °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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