Jetty Rock Weather Forecast
- 12
- 17
Rain
- 11
- 19
Shower
- 11
- 18
Cloudy
- 12
- 19
Shower
- 11
- 18
Cloudy
- 11
- 20
Cloudy
- 9
- 26
Partly cloudy
Today 21 Dec Lower South East
Cloudy. Very high chance of rain, becoming less likely in the late afternoon and evening. The chance of a thunderstorm in the morning and early afternoon. Light winds becoming south to southeasterly 15 to 20 km/h in the morning then turning southwesterly 25 to 40 km/h in the late morning. Daytime maximum temperatures between 18 and 22.
Lower South East Coastal Waters
Cape Jaffa to SA-Vic Border- Wind
- Southeasterly 15 to 20 knots turning southwesterly 15 to 25 knots in the middle of the day.
- Seas
- Around 1 metre, increasing to 1 to 1.5 metres during the morning, then increasing to 1.5 to 2 metres during the afternoon.
- 1st Swell
- Southerly 1.5 to 2 metres, tending southwesterly 1 to 1.5 metres during the morning, then decreasing to around 1 metre by early evening.
- Weather
- Cloudy. 90% chance of rain. The chance of a thunderstorm in the morning.
- Weather Situation
- A broad trough of low pressure lingers over the east and northern parts of the State. A low pressure system lies south of the bight and moves east to combine with the trough early Sunday. The combined low pressure system and trough then moves east to clear SA by late Sunday. A high pressure ridge then extends over the west and south of the State behind the low pressure system during Sunday. The high pressure ridge extends across the entire State and Coastal Waters by late Sunday and persists from Monday to Thursday.
Jetty Rock Temperature Statistics View More
December Temperature
Mount Gambier Airport (35km)
Lowest 7 December, 2025
4.7 °CAverage December
16.2 °CHighest 18 December, 2025
38.9 °C
Climate (2020–Present)
Mount Gambier Airport (35km)
Average Low 2020–2025
8.8 °CAverage 2020–2025
13.6 °CAverage High 2020–2025
19.9 °C