Stack Island Weather Forecast
- 10
- 17
Partly cloudy
- 10
- 21
Sunny
- 16
- 26
Sunny
- 15
- 26
Sunny
- 18
- 23
Shower or two
- 14
- 17
Shower or two
- 14
- 19
Possible shower
Today 17 Sep Illawarra
Cloud clearing. Areas of frost about higher ground early this morning. Winds southwesterly 15 to 20 km/h tending southerly in the morning then becoming light in the middle of the day. Daytime maximum temperatures between 16 and 20.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- South to southwesterly 15 to 25 knots, reaching up to 30 knots offshore north of Point Perpendicular early in the morning. Winds becoming variable about 10 knots in the late afternoon.
- Seas
- 1.5 to 2.5 metres, decreasing to 1 to 1.5 metres around midday, then decreasing below 1 metre by early evening.
- 1st Swell
- Southerly 2 to 2.5 metres.
- Weather
- Partly cloudy.
- Weather Situation
- A strong high over the Great Australian Bight is moving east in the wake of a trough in the Tasman Sea, directing strong and blustery southerly winds over the coastal waters. The winds will ease from the evening as the high moves across the state later in the week and into the weekend.
Stack Island Temperature Statistics View More
September Temperature
Kiama (Bombo Headland) (3km)
Lowest 9 September, 2026
9.5 °CAverage September
16.6 °CHighest 5 September, 2026
29.8 °C
Climate (2021–2026)
Kiama (Bombo Headland) (3km)
Average Low 2021–2026
14.9 °CAverage 2021–2026
17.9 °CAverage High 2021–2026
21.5 °C