Swan Island Weather Forecast
- 12
- 17
Rain
- 11
- 20
Cloudy
- 12
- 19
Shower
- 11
- 21
Windy
- 11
- 17
Windy
- 11
- 17
Cloudy
- 11
- 23
Partly cloudy
Today 21 Dec Central
Cloudy. High chance of showers, becoming less likely later this evening. A thunderstorm likely in the east early this evening, possibly severe with damaging winds and heavy rain which may lead to flash flooding. Winds southwesterly 20 to 30 km/h.
Port Phillip Local Waters
- Wind
- Southerly 15 to 20 knots turning southwesterly 15 to 25 knots in the late afternoon. Winds reaching up to 30 knots in the south in the evening.
- Seas
- Around 1 metre.
- Weather
- Cloudy. 80% chance of rain. The chance of a thunderstorm in the north early this evening.
- Weather Situation
- A low pressure system lies over eastern Victoria and Bass Strait and is expected to deepen as it moves southeast into the Tasman Sea by late Sunday. A high pressure ridge then builds across Victoria and Bass Strait during Monday. A weak cold front crosses Bass Strait during late Monday and early Tuesday with the ridge re-establishing itself over Bass Strait from Tuesday to Thursday.
Swan Island Temperature Statistics View More
December Temperature
Avalon Airport (30km)
Lowest 7 December, 2025
6.6 °CAverage December
17.2 °CHighest 18 December, 2025
39.5 °C
Climate (2020–Present)
Avalon Airport (30km)
Average Low 2020–2025
9.6 °CAverage 2020–2025
14.5 °CAverage High 2020–2025
20.4 °C