Stack Island Weather Forecast

    • 10
    • 20

    Cloud clearing

    • 13
    • 22

    Sunny

    • 14
    • 24

    Shower or two

    • 15
    • 21

    Showers increasing

    • 10
    • 17

    Wind easing. Partly cloudy

    • 10
    • 18

    Mostly sunny

    • 10
    • 22

    Sunny

Today 12 Sep Illawarra

The chance of fog in the early morning. Mostly sunny day. Light winds becoming east to northeasterly 15 to 20 km/h in the middle of the day then becoming light in the evening. Daytime maximum temperatures in the low 20s.

Illawarra Coastal Waters

Port Hacking to Ulladulla
Wind
North to northwesterly about 10 knots tending north to northeasterly 15 to 20 knots in the middle of the day.
Seas
Below 0.5 metres, increasing to around 1 metre around midday.
1st Swell
Southerly 1.5 to 2 metres, decreasing to 1.5 metres later in the evening.
Weather
Cloud clearing.
Weather Situation
A slow-moving high pressure lies over the Tasman Sea generating stable conditions for NSW Coastal Waters. Trough and cold front are expected to reach the southern coastal waters late Monday and reach the northern waters late Tuesday bringing unsettled weather.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Stack Island Temperature Statistics View More

September Temperature

Kiama (Bombo Headland) (3km)

  • Lowest 9 September, 2026

    9.5 °C

  • Average September

    16.9 °C

  • Highest 5 September, 2026

    29.8 °C

Climate (2021–2026)

Kiama (Bombo Headland) (3km)

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  • Average Low 2021–2026

    14.9 °C

  • Average 2021–2026

    17.9 °C

  • Average High 2021–2026

    21.5 °C
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