Perth FAD3 (offshore) Weather Forecast
- 18
- 19
Rain
- 16
- 18
Shower
- 14
- 18
Windy
- 15
- 20
Partly cloudy
- 17
- 19
Partly cloudy
- 18
- 19
Shower
- 16
- 17
Shower
Today 26 Aug Perth
Cloudy. 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 southwest during the morning and afternoon. Winds northerly 15 to 20 km/h turning west to northwesterly 15 to 25 km/h in the middle of the day then tending southeast to southwesterly 15 to 20 km/h in the evening.
Perth Coastal Waters
Two Rocks to Dawesville, offshore from Rottnest Island- Wind
- Northwesterly 15 to 20 knots shifting southerly 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 by early evening.
- 1st Swell
- Westerly 2.5 to 3 metres, tending southwesterly 3 to 4 metres during the morning.
- Weather
- Cloudy. Near 100% chance of rain. The chance of a thunderstorm.
- Weather Situation
- A high pressure ridge over southeastern WA is moving east. A slow-moving cold front and trough will reach the west coast on Wednesday, continuing eastward on Thursday as a low pressure centre develops in the trough near the south coast. In the wake of the front and trough, a new ridge will strengthen across the west coast from Thursday.
Perth FAD3 (offshore) Temperature Statistics View More
August Temperature
Rottnest Island (46km)
Lowest 9 August, 2026
7.4 °CAverage August
15.5 °CHighest 16 August, 2026
23.2 °C
Climate (2021–2026)
Rottnest Island (46km)
Average Low 2021–2026
16.1 °CAverage 2021–2026
18.9 °CAverage High 2021–2026
22.8 °C