Castlecrag Marine Weather Forecast

    • 13
    • 23

    Mostly clear

    • 13
    • 26

    Shower or two

    • 15
    • 24

    Sunny day. Late shower or two

    • 11
    • 18

    Possible shower. Windy

    • 9
    • 19

    Possible shower

    • 9
    • 23

    Sunny

    • 12
    • 26

    Sunny

Today 13 Sep Sydney

Mostly clear. The chance of smoke haze. Winds northeasterly 15 to 25 km/h becoming light in the late evening.

Sydney Enclosed Waters

Sydney Harbour, Pittwater and Botany Bay
Wind
Northeasterly 15 to 20 knots tending northerly 10 to 15 knots in the late evening.
Seas
Below 0.5 metres.
Weather
Mostly clear.
Weather Situation
A trough looks set to bring southerly winds to Sydney Waters on Tuesday, which will freshen or strengthen later Tuesday and Wednesday as a cold front moves into the Tasman Sea. After this, southerly winds will persist as a new ridge of high pressure extends across from the west.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Castlecrag Marine Temperature Statistics View More

September Temperature

Sydney (Observatory Hill) (6km)

  • Lowest 9 September, 2026

    9.8 °C

  • Average September

    17.3 °C

  • Highest 5 September, 2026

    32.1 °C

Climate (2021–2026)

Sydney (Observatory Hill) (6km)

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  • Average Low 2021–2026

    14.9 °C

  • Average 2021–2026

    18.5 °C

  • Average High 2021–2026

    23.6 °C
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