Mary Bay Weather Forecast
- 16
- 29
Sunny
- 19
- 27
Cloudy
- 18
- 29
Mostly sunny
- 19
- 31
Sunny
- 20
- 27
Shower or two
- 15
- 21
Shower or two
- 15
- 25
Shower or two
Today 28 Jan Illawarra
Sunny. Winds northwest to northeasterly 15 to 20 km/h tending northeast to southeasterly 15 to 25 km/h in the middle of the day then becoming light in the evening. Overnight temperatures falling to between 13 and 17 with daytime temperatures reaching 29 to 36.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- North to northeasterly 15 to 20 knots, reaching up to 25 knots south of Port Kembla during the morning and early afternoon. Winds decreasing to about 10 knots in the late evening.
- Seas
- 1 to 1.5 metres, increasing to 1 to 2 metres during the morning.
- 1st Swell
- Southeasterly 1.5 to 2 metres, decreasing to 1 to 1.5 metres during the morning, then decreasing to around 1 metre during the afternoon.
- Weather
- Mostly sunny.
Mary Bay Temperature Statistics View More
January Temperature
Point Perpendicular (13km)
Lowest 12 January, 2026
15.6 °CAverage January
21 °CHighest 10 January, 2026
39.6 °C
Climate (2021–Present)
Point Perpendicular (13km)
Average Low 2021–2026
14.7 °CAverage 2021–2026
17.4 °CAverage High 2021–2026
20.7 °C