Jervis Bay Weather Forecast
- 9
- 18
Clear
- 9
- 20
Partly cloudy
- 11
- 22
Mostly sunny
- 9
- 16
Partly cloudy
- 9
- 18
Partly cloudy
- 10
- 21
Mostly sunny
- 13
- 23
Shower or two
Today 2 Sep Illawarra
Partly cloudy. Patchy fog inland early this morning. Slight chance of a shower during the morning and afternoon. Light winds becoming north to northeasterly 15 to 20 km/h in the morning then turning west to northwesterly in the afternoon. Daytime maximum temperatures between 16 and 20.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Variable below 10 knots becoming north to northeasterly 10 to 15 knots in the middle of the day then tending north to northwesterly 15 to 20 knots in the evening.
- Seas
- Below 0.5 metres, increasing to around 1 metre during the afternoon.
- 1st Swell
- Southerly 1 to 1.5 metres.
- Weather
- Partly cloudy. The chance of a thunderstorm.
- Weather Situation
- A high pressure system with its centre near South Australia is extending a ridge across the state, and this ridge will be the dominant feature for the next couple of days as its centre slowly moves eastwards. A trough is forecast to brush the south and along the coast mid to late this week, and this system will be followed by another high pressure ridge drifting across the state during the weekend.
Jervis Bay Temperature Statistics View More
September Temperature
Point Perpendicular (8km)
Lowest 1 September, 2025
9.2 °CAverage September
11.6 °CHighest
–
Climate (2020–Present)
Point Perpendicular (8km)
Average Low 2020–2025
14.7 °CAverage 2020–2025
17.4 °CAverage High 2020–2025
20.7 °C