Boat Harbour Weather Forecast
- 19
- 33
Possible shower or storm
- 18
- 29
Shower or two. Possible storm
- 21
- 28
Becoming cloudy
- 17
- 28
Possible shower
- 15
- 31
Sunny day. Late shower or two
- 15
- 23
Shower or two
- 14
- 24
Partly cloudy
Today 20 Dec Illawarra
Partly cloudy. Medium chance of showers, becoming less likely in the evening. The chance of a thunderstorm in the afternoon and early evening, possibly severe with damaging winds, large hail and heavy rain which may lead to flash flooding inland. Winds northwest to northeasterly 15 to 20 km/h tending west to northwesterly 15 to 25 km/h in the middle of the day then becoming light in the evening. Daytime maximum temperatures in the low to mid 30s.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- North to northeasterly 10 to 15 knots, reaching up to 20 knots south of Port Kembla during the afternoon and evening.
- Seas
- Around 1 metre, increasing to 1 to 1.5 metres south of Port Kembla during the afternoon.
- 1st Swell
- Northeasterly below 1 metre.
- Weather
- Partly cloudy. The chance of a thunderstorm in the afternoon and early evening.
- Weather Situation
- A high in the Tasman Sea is directing northerly winds over central and northern Coastal Waters while a weak coastal trough brings southerly winds to the remainder. A cold front will bring a fresh to strong southerly change later on Sunday or Monday.
Boat Harbour Temperature Statistics View More
December Temperature
Point Perpendicular (2km)
Lowest 2 December, 2025
10.3 °CAverage December
20.2 °CHighest 5 December, 2025
33 °C
Climate (2020–Present)
Point Perpendicular (2km)
Average Low 2020–2025
14.7 °CAverage 2020–2025
17.4 °CAverage High 2020–2025
20.7 °C