Mary Bay Weather Forecast

    • 8
    • 21

    Mostly sunny

    • 8
    • 22

    Sunny

    • 10
    • 24

    Mostly sunny

    • 12
    • 28

    Partly cloudy

    • 14
    • 22

    Showers

    • 10
    • 18

    Partly cloudy

    • 8
    • 20

    Sunny

Today 11 Sep Illawarra

Partly cloudy. Patches of frost and the chance of fog inland in the early morning. Light winds. Overnight temperatures falling to between 1 and 8 with daytime temperatures reaching between 18 and 21.

Illawarra Coastal Waters

Port Hacking to Ulladulla
Wind
Southerly 10 to 15 knots becoming variable about 10 knots in the middle of the day.
Seas
Around 1 metre.
1st Swell
Southerly 2 to 2.5 metres.
Weather
Partly cloudy.
Caution
Surf conditions may be more powerful than they appear and are expected to be hazardous for coastal activities such as crossing bars by boat and rock fishing.
Weather Situation
Fresh southerly winds will ease and tend more southeasterly today as a high pressure ridge over the Bight moves eastward. By the weekend the high will move over the Tasman Sea, directing east to northeasterly winds along the coast on Saturday, tending fresh over southern parts of the coast on Sunday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mary Bay Temperature Statistics View More

September Temperature

Point Perpendicular (13km)

  • Lowest 9 September, 2026

    10.8 °C

  • Average September

    16.7 °C

  • Highest 5 September, 2026

    26.4 °C

Climate (2021–2026)

Point Perpendicular (13km)

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  • Average Low 2021–2026

    14.8 °C

  • Average 2021–2026

    17.5 °C

  • Average High 2021–2026

    20.9 °C
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