Mosman Bay Marina Weather Forecast

    • 19
    • 28

    Shower or two

    • 14
    • 19

    Shower or two

    • 15
    • 22

    Shower or two

    • 15
    • 24

    Mostly sunny

    • 15
    • 26

    Sunny

    • 16
    • 28

    Possible shower developing

    • 15
    • 20

    Shower or two

Today 21 Sep Sydney

Sunny morning. Medium chance of showers in the afternoon and evening. The chance of a thunderstorm in the outer west in the afternoon. Winds north to northwesterly 15 to 25 km/h shifting south to southeasterly 25 to 40 km/h during the morning.

Sydney Enclosed Waters

Sydney Harbour, Pittwater and Botany Bay
Wind
Northwesterly 10 to 15 knots shifting southerly 15 to 25 knots in the middle of the day. Winds may reach up to 30 knots at times.
Seas
Below 0.5 metres.
Weather
Becoming cloudy. 50% chance of showers late this afternoon and evening.
Weather Situation
A high pressure system over the Tasman Sea directs a northwesterly flow over the Sydney Waters early today, ahead of a fresh and gusty southerly change arriving in the late morning. Winds are forecast to turn northeasterly by mid-week as a new high pressure system slips south of the state and enters the Tasman Sea by mid-week.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mosman Bay Marina Temperature Statistics View More

September Temperature

Sydney (Observatory Hill) (3km)

  • Lowest 18 September, 2026

    9.4 °C

  • Average September

    17.5 °C

  • Highest 5 September, 2026

    32.1 °C

Climate (2021–2026)

Sydney (Observatory Hill) (3km)

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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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