Cape Portland Weather Forecast
- 13
- 21
Shower
- 10
- 19
Shower
- 11
- 19
Windy
- 11
- 18
Shower
- 11
- 19
Windy
- 9
- 19
Windy
- 8
- 20
Partly cloudy
Today 20 Dec North East
Slight chance of a shower early this morning. The chance of a thunderstorm early this morning. Sunny afternoon. Winds west to northwesterly 25 to 35 km/h. Daytime maximum temperatures between 19 and 25.
Banks Strait and Franklin
- Wind
- Northwest to northeasterly 10 to 15 knots becoming northwesterly 15 to 20 knots in the morning then tending westerly 15 to 25 knots in the middle of the day. Winds reaching up to 30 knots near Eddystone Point in the late afternoon.
- Seas
- Around 1 metre, increasing to 1.5 to 2 metres around midday.
- 1st Swell
- Easterly 1 to 1.5 metres, decreasing below 1 metre during the morning.
- Weather
- 50% chance of showers early this morning. The chance of a thunderstorm early this morning. Mostly sunny afternoon.
- Weather Situation
- A broad low pressure system lies to the west of Tasmania and is forecast to deepen and slowly move south east over Tasmania during Saturday and clear the State to the south on Sunday. A second, more intense, low pressure system is then forecast to move across Bass Strait Sunday and clear to the east Monday morning. A ridge of high pressure then extends across Tasmania and persists Monday and Tuesday to direct a westerly flow.
Cape Portland Temperature Statistics View More
December Temperature
Swan Island (12km)
Lowest 2 December, 2025
8.3 °CAverage December
15 °CHighest 13 December, 2025
24.2 °C
Climate (2020–Present)
Swan Island (12km)
Average Low 2020–2025
11.9 °CAverage 2020–2025
14.3 °CAverage High 2020–2025
17.5 °C