Alcoa Jetty Weather Forecast
- 17
- 28
Cloud clearing
- 14
- 27
Sunny
- 16
- 29
Sunny
- 18
- 33
Sunny
- 21
- 36
Sunny
- 26
- 37
Sunny
- 23
- 29
Cloud clearing
Today 20 Dec Perth
Mostly sunny. Winds southerly 25 to 35 km/h turning southeasterly 15 to 25 km/h in the evening.
Perth Local Waters
Two Rocks to Dawesville, inshore from Rottnest Island- Wind
- Southerly 20 to 30 knots decreasing to 15 to 25 knots in the early morning then tending south to southeasterly 20 to 30 knots in the late afternoon.
- Seas
- 1.5 to 2.5 metres, decreasing to 1.5 metres during the morning, then increasing to 2 to 2.5 metres during the afternoon.
- 1st Swell
- Southwesterly below 1 metre.
- Weather
- Cloud clearing.
- Weather Situation
- A west coast trough will move inland today followed by a strengthening ridge. Another weak front will brush the south coast on Monday, followed by the west coast trough returning by Tuesday.
Alcoa Jetty Temperature Statistics View More
December Temperature
Garden Island (10km)
Lowest 4 December, 2025
16.4 °CAverage December
22 °CHighest 14 December, 2025
38.8 °C
Climate (2020–Present)
Garden Island (10km)
Average Low 2020–2025
15.2 °CAverage 2020–2025
19 °CAverage High 2020–2025
23.4 °C