Stack Island Weather Forecast
- 9
- 19
Mostly sunny
- 10
- 19
Mostly sunny
- 10
- 19
Mostly sunny
- 13
- 17
Mostly sunny
- 8
- 16
Sunny
- 8
- 17
Sunny
- 10
- 17
Mostly sunny
Today 20 Jul Illawarra
Areas of frost about higher ground early this morning. Patchy morning fog. Sunny afternoon. Light winds becoming northerly 15 to 20 km/h in the middle of the day then becoming light in the early afternoon. Daytime maximum temperatures between 16 and 19.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Variable about 10 knots becoming northerly 10 to 15 knots in the morning. Winds reaching up to 20 knots south of Port Kembla during the afternoon and evening.
- Seas
- Below 1 metre, increasing to 1 to 1.5 metres south of Port Kembla during the afternoon.
- 1st Swell
- Northeasterly 1 to 2 metres.
- Weather
- Mostly sunny.
- Weather Situation
- A coastal trough and associated low in the Coral Sea combine with a high pressure ridge over the far southern coastal waters promoting strong south to southeasterly winds and large and powerful waves along the north coast today. Meanwhile, the high will slowly move over the Tasman Sea early this week, with winds turning northerly by mid week as the ridge builds along the coast.
Stack Island Temperature Statistics View More
July Temperature
Kiama (Bombo Headland) (3km)
Lowest 11 July, 2026
8.6 °CAverage July
14.1 °CHighest 2 July, 2026
22.2 °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