Armstrong Rock Weather Forecast
- 15
- 19
Rain
- 12
- 18
Showers easing. Windy
- 11
- 18
Wind easing. Partly cloudy
- 12
- 20
Partly cloudy
- 14
- 21
Sunny
- 16
- 20
Shower or two
- 12
- 17
Possible shower
Today 26 Aug Lower West
Partly cloudy. The chance of fog in the north early this morning. Very high chance of rain, most likely during this afternoon and evening. The chance of a thunderstorm, possibly severe with heavy rain which may lead to flash flooding in the south during the morning and afternoon. Light winds becoming north to northwesterly 15 to 20 km/h in the morning then tending west to northwesterly 20 to 30 km/h in the middle of the day. Daytime maximum temperatures between 17 and 22.
Perth Local Waters
Two Rocks to Dawesville, inshore from Rottnest Island- Wind
- North to northwesterly 15 to 20 knots shifting southerly in the afternoon.
- Seas
- 1 to 1.5 metres, decreasing to 1 metre during the afternoon.
- 1st Swell
- Westerly 2 metres, increasing to 2 to 3 metres during the morning, then tending west to southwesterly 2.5 to 3 metres during the afternoon.
- Weather
- Cloudy. Near 100% chance of rain. The chance of a thunderstorm.
- Weather Situation
- Northwesterly winds this afternoon ahead of a slow-moving cold front approaching the southwest of the State. The front will pass through the local waters later on Wednesday, with a new ridge strengthening across the west coast on Thursday and Friday.
Armstrong Rock Temperature Statistics View More
August Temperature
Rottnest Island (1km)
Lowest 9 August, 2026
7.4 °CAverage August
15.5 °CHighest 16 August, 2026
23.2 °C
Climate (2021–2026)
Rottnest Island (1km)
Average Low 2021–2026
16.1 °CAverage 2021–2026
18.9 °CAverage High 2021–2026
22.8 °C