Green Island Weather Forecast
- 12
- 18
Morning shower or two
- 11
- 23
Partly cloudy
- 15
- 19
Mostly sunny
- 9
- 19
Partly cloudy
- 12
- 20
Shower or two
- 10
- 16
Possible shower
- 10
- 18
Sunny
Today 18 Sep South Coast
Partly cloudy. Areas of morning frost about the coastal ranges. Slight chance of a shower in the north this morning. Near zero chance of rain elsewhere. Light winds becoming northeasterly 15 to 25 km/h in the middle of the day then becoming light in the evening. Daytime maximum temperatures between 16 and 19.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Southeast to southwesterly 10 to 15 knots tending northeast to southeasterly in the morning then tending north to northeasterly 15 to 20 knots in the middle of the day. Winds reaching up to 25 knots offshore north of Port Kembla in the late evening.
- Seas
- Around 1 metre, increasing to 1 to 1.5 metres offshore by early evening.
- 1st Swell
- Southerly 1.5 to 2 metres, decreasing to 1 to 1.5 metres during the afternoon.
- Weather
- Partly cloudy. 70% chance of showers.
- Weather Situation
- In the wake of a cold front, south to southwesterly winds will tend northerly and strengthen today as a high pressure system drifts across the coastal waters. Winds will shift west to southwesterly again over the weekend as a stronger cold front moves over NSW coastal waters, with southwesterly winds persisting into early next week as a series of fronts brush the south of the state.
Green Island Temperature Statistics View More
September Temperature
Ulladulla (10km)
Lowest 12 September, 2025
7.3 °CAverage September
16 °CHighest 16 September, 2025
27.8 °C
Climate (2020–Present)
Ulladulla (10km)
Average Low 2020–2025
13.8 °CAverage 2020–2025
17 °CAverage High 2020–2025
20.8 °C