Jervis Bay Harbour Weather Forecast
- 8
- 18
Partly cloudy
- 8
- 18
Partly cloudy
- 7
- 19
Mostly sunny
- 7
- 20
Mostly sunny
- 8
- 21
Mostly sunny
- 8
- 16
Mostly sunny
- 6
- 16
Sunny
Today 18 Jul Illawarra
Partly cloudy. Patchy fog this morning, mainly inland. Slight chance of a shower in the north, becoming less likely this morning. Near zero chance of rain elsewhere. Light winds. Daytime maximum temperatures between 15 and 19.
Illawarra Coastal Waters
Port Hacking to Ulladulla- Wind
- Southeasterly 10 to 15 knots.
- Seas
- Below 0.5 metres, increasing to below 1 metre north of Point Perpendicular.
- 1st Swell
- Southerly 1 to 1.5 metres.
- Weather
- Partly cloudy.
- Weather Situation
- A coastal trough and associated low off the north coast combine with a high pressure ridge over the far southern coastal waters promoting strong south to southeasterly winds and large and powerful waves along the north coast during the weekend. Meanwhile, the ridge will build over the southern coastal waters ahead of the high crossing during the weekend, before spreading north during early next week.
Jervis Bay Harbour Temperature Statistics View More
July Temperature
Point Perpendicular (9km)
Lowest 11 July, 2026
8.6 °CAverage July
13.9 °CHighest 2 July, 2026
20.3 °C
Climate (2021–2026)
Point Perpendicular (9km)
Average Low 2021–2026
14.8 °CAverage 2021–2026
17.5 °CAverage High 2021–2026
20.8 °C