Mary Bay Weather Forecast

    • 15
    • 33

    Sunny

    • 15
    • 25

    Partly cloudy

    • 16
    • 23

    Showers

    • 16
    • 24

    Showers. Possible afternoon storm

    • 15
    • 30

    Shower or two

    • 16
    • 33

    Mostly sunny

    • 15
    • 24

    Shower or two

Today 9 Dec Illawarra

Mostly sunny. The chance of fog in the north early this morning. Slight chance of a shower in the south late this afternoon and evening. Near zero chance of rain elsewhere. Winds west to northwesterly 15 to 20 km/h shifting south to southeasterly 25 to 35 km/h in the late morning and early afternoon. Daytime maximum temperatures 31 to 36.

Illawarra Coastal Waters

Port Hacking to Ulladulla
Wind
Northerly 15 to 20 knots shifting southerly 15 to 25 knots in the late afternoon. Winds reaching up to 30 knots in the evening.
Seas
1 to 1.5 metres, increasing to 1 to 2 metres by early evening.
1st Swell
Northeasterly below 1 metre.
Weather
Sunny.
Weather Situation
A ridge is strengthening over coastal areas in the wake of a front, before a trough brushes central and southern parts of the coast later today and on Wednesday, bringing a southerly change with it. High pressure will build in the Tasman Sea later in the week, bringing east to northeasterly winds to coastal waters.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mary Bay Temperature Statistics View More

December Temperature

Point Perpendicular (13km)

  • Lowest 2 December, 2025

    10.3 °C

  • Average December

    20.1 °C

  • Highest 5 December, 2025

    33 °C

Climate (2020–Present)

Point Perpendicular (13km)

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  • Average Low 2020–2025

    14.7 °C

  • Average 2020–2025

    17.4 °C

  • Average High 2020–2025

    20.7 °C
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