Mary Bay Weather Forecast
- 11
- 23
Sunny
- 11
- 29
Possible shower. Windy
- 12
- 23
Sunny
- 9
- 21
Shower or two
- 10
- 19
Partly cloudy
- 9
- 19
Possible shower
- 8
- 19
Mostly sunny
Today 4 Sep Illawarra
Mostly sunny. Slight chance of a shower along the coastal fringe at night. Near zero chance of rain elsewhere. Winds west to northwesterly 20 to 30 km/h. Daytime maximum temperatures between 18 and 23.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- West to southwesterly 10 to 15 knots, reaching up to 20 knots offshore north of Port Kembla early in the morning. Winds shifting east to northeasterly during the morning then tending northwest to northeasterly in the early afternoon.
- Seas
- 1 to 1.5 metres, decreasing to 1 metre during the morning.
- 1st Swell
- Southerly 1 to 2 metres, decreasing to 1 to 1.5 metres during the afternoon.
- Weather
- Cloud clearing.
- Weather Situation
- South to southwesterly winds as a high pressure system centred over the state moves east into the Tasman Sea. A weak trough developing over the southern waters today brings northeasterly winds to the southern coasts. North to northwesterly winds redevelop across the state's coast ahead of a vigorous cold front crossing the waters late Saturday into Sunday.
Mary Bay Temperature Statistics View More
September Temperature
Point Perpendicular (13km)
Lowest 1 September, 2026
12.8 °CAverage September
19.5 °CHighest 1 September, 2026
24.8 °C
Climate (2021–2026)
Point Perpendicular (13km)
Average Low 2021–2026
14.8 °CAverage 2021–2026
17.5 °CAverage High 2021–2026
20.8 °C