Mary Bay Weather Forecast

    • 19
    • 30

    Mostly sunny

    • 21
    • 25

    Shower or two

    • 15
    • 22

    Partly cloudy

    • 16
    • 25

    Cloudy

    • 16
    • 28

    Mostly sunny

    • 18
    • 29

    Possible shower

    • 18
    • 27

    Cloudy

Today 31 Jan Illawarra

Mostly sunny. The chance of fog in the early morning. Slight chance of a shower inland, near zero chance elsewhere. The chance of a thunderstorm in the afternoon and evening. Thunderstorms possibly severe with damaging winds, large hail and heavy rain which may lead to flash flooding in the afternoon and evening. Light winds becoming east to northeasterly 15 to 25 km/h in the middle of the day then becoming light in the late evening. Overnight temperatures falling to between 17 and 20 with daytime temperatures reaching 30 to 37.

Illawarra Coastal Waters

Port Hacking to Ulladulla
Wind
North to northeasterly 15 to 20 knots, reaching up to 25 knots offshore during the afternoon and evening.
Seas
1 to 1.5 metres, decreasing to 1 metre during the morning, then increasing to 1.5 to 2 metres around midday.
1st Swell
Northeasterly below 1 metre.
Weather
Mostly sunny morning. The chance of a thunderstorm south of Point Perpendicular in the afternoon and evening.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Mary Bay Temperature Statistics View More

January Temperature

Point Perpendicular (13km)

  • Lowest 12 January, 2026

    15.6 °C

  • Average January

    21.1 °C

  • Highest 10 January, 2026

    39.6 °C

Climate (2021–Present)

Point Perpendicular (13km)

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  • Average Low 2021–2026

    14.7 °C

  • Average 2021–2026

    17.4 °C

  • Average High 2021–2026

    20.7 °C
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