Mary Bay Weather Forecast
- 16
- 36
Mostly sunny
- 19
- 36
Partly cloudy
- 15
- 21
Shower or two
- 14
- 28
Partly cloudy
- 15
- 32
Mostly sunny
- 16
- 24
Cloudy
- 15
- 23
Shower or two
Today 5 Dec Illawarra
Sunny morning. The chance of a thunderstorm in the afternoon. Winds west to northwesterly 20 to 30 km/h tending north to northwesterly 15 to 20 km/h in the evening. Overnight temperatures falling to between 13 and 18 with daytime temperatures reaching the low to high 30s.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Northerly 15 to 25 knots.
- Seas
- 1 to 2 metres, decreasing to 1 metre during the morning, then increasing to 1 to 1.5 metres during the afternoon.
- 1st Swell
- Northeasterly below 1 metre, increasing to 1 to 1.5 metres during the morning, then decreasing to around 1 metre during the afternoon.
- Weather
- Sunny.
Mary Bay Temperature Statistics View More
December Temperature
Point Perpendicular (13km)
Lowest 2 December, 2025
10.3 °CAverage December
18.3 °CHighest 3 December, 2025
25.1 °C
Climate (2020–Present)
Point Perpendicular (13km)
Average Low 2020–2025
14.7 °CAverage 2020–2025
17.4 °CAverage High 2020–2025
20.7 °C