Armstrong Rock Weather Forecast
- 16
- 23
Becoming windy. Partly cloudy
- 16
- 23
Windy. Sunny
- 17
- 23
Sunny
- 17
- 24
Windy. Sunny
- 17
- 25
Windy. Mostly sunny
- 19
- 25
Sunny
- 20
- 25
Becoming windy. Sunny
Today 5 Dec Lower West
The chance of smoke haze early this morning. Mostly sunny afternoon. Winds southerly 15 to 25 km/h tending southwesterly 25 to 35 km/h in the middle of the day. Daytime maximum temperatures in the mid to high 20s.
Perth Local Waters
Two Rocks to Dawesville, inshore from Rottnest Island- Wind
- South to southeasterly 15 to 20 knots tending south to southwesterly 15 to 25 knots in the late morning.
- Seas
- 1 to 1.5 metres, decreasing to 1 metre during the morning, then increasing to 1 to 1.5 metres during the afternoon.
- 1st Swell
- Southwesterly 1 to 1.5 metres.
- Weather
- Partly cloudy.
- Weather Situation
- A ridge about the southwest coast will develop further after a weak front brushes past the south coast on Friday morning. The ridge will weaken on Sunday night, as a second weak cold front moves past the south coast on Monday. A new ridge will follow in the front's wake.
Armstrong Rock Temperature Statistics View More
December Temperature
Rottnest Island (1km)
Lowest 4 December, 2025
16.7 °CAverage December
21.1 °CHighest 1 December, 2025
36.2 °C
Climate (2020–Present)
Rottnest Island (1km)
Average Low 2020–2025
16.1 °CAverage 2020–2025
19 °CAverage High 2020–2025
22.8 °C