O'Sullivan Beach Weather Forecast
- 11
- 18
Cloud clearing
- 10
- 17
Showers
- 9
- 15
Showers
- 9
- 15
Possible shower
- 8
- 15
Partly cloudy
- 8
- 18
Mostly sunny
- 13
- 20
Partly cloudy
Today 8 Sep Adelaide
Partly cloudy. Medium chance of showers about the hills and southern suburbs, slight chance elsewhere. Winds north to northwesterly 15 to 20 km/h tending west to northwesterly in the middle of the day then becoming light in the late afternoon.
Adelaide Metropolitan Waters
- Wind
- North to northwesterly 10 to 15 knots becoming variable below 10 knots in the middle of the day.
- Seas
- Below 1 metre.
- 1st Swell
- West to southwesterly below 1 metre.
- Weather
- Cloud clearing.
- Weather Situation
- Mostly settled conditions will continue across coastal waters until a small low pressure system and associated trough moves over coastal waters through Tuesday. This trough will push inland through Wednesday resulting in a south to southwesterly airstream across coastal waters. A high pressure ridge will begin to extend over western waters late Wednesday with the high pressure centre establishing in the Bight by late Thursday.
O'Sullivan Beach Temperature Statistics View More
September Temperature
Noarlunga (5km)
Lowest 5 September, 2025
8 °CAverage September
15.2 °CHighest 6 September, 2025
28.3 °C
Climate (2020–Present)
Noarlunga (5km)
Average Low 2020–2025
12.7 °CAverage 2020–2025
16.7 °CAverage High 2020–2025
21.8 °C