Mosman Bay Weather Forecast

    • 15
    • 24

    Sunny day. Late shower or two

    • 11
    • 18

    Partly cloudy

    • 10
    • 19

    Cloud clearing

    • 9
    • 23

    Sunny

    • 12
    • 27

    Sunny

    • 13
    • 28

    Sunny

    • 17
    • 25

    Partly cloudy

Today 15 Sep Sydney

Sunny day. Medium chance of showers in the late afternoon and evening. Winds south to southeasterly 15 to 25 km/h increasing to 20 to 30 km/h in the evening.

Sydney Enclosed Waters

Sydney Harbour, Pittwater and Botany Bay
Wind
South to southeasterly 15 to 20 knots becoming southerly 20 to 30 knots in the evening then decreasing to 15 to 25 knots in the late evening. Squalls possible with the wind change.
Seas
Below 0.5 metres.
Weather
Sunny day. 50% chance of showers in the late afternoon and evening.
Weather Situation
A cold front looks set to bring southerly winds to Sydney Waters today. After this, southerly winds will persist through to Thursday as new ridge of high pressure extends across from the west, and then ease on Friday as the high becomes more predominant.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mosman Bay Temperature Statistics View More

September Temperature

Sydney (Observatory Hill) (3km)

  • Lowest 9 September, 2026

    9.8 °C

  • Average September

    17.4 °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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