Mary Street Lagoon Weather Forecast
- 16
- 31
Mostly sunny
- 18
- 31
Sunny
- 17
- 28
Cloud clearing
- 14
- 27
Sunny
- 16
- 30
Sunny
- 18
- 33
Sunny
- 21
- 36
Sunny
Today 18 Dec Mandurah
Mostly sunny. Winds south to southeasterly 25 to 35 km/h.
Perth Local Waters
Two Rocks to Dawesville, inshore from Rottnest Island- Wind
- Southeasterly 15 to 20 knots tending southeast to southwesterly 15 to 25 knots in the morning then becoming southeasterly 15 to 20 knots in the late evening. Winds reaching up to 30 knots in the evening.
- 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 below 1 metre.
- Weather
- Sunny.
- Weather Situation
- A ridge extends across the southwest coast today. A west coast trough will form on Friday and move inland during the day, ahead of a new ridge developing on Saturday.
Mary Street Lagoon Temperature Statistics View More
December Temperature
Mandurah (0km)
Lowest 4 December, 2025
16.1 °CAverage December
23.5 °CHighest 14 December, 2025
40.1 °C
Climate (2020–Present)
Mandurah (0km)
Average Low 2020–2025
15.1 °CAverage 2020–2025
19.2 °CAverage High 2020–2025
23.8 °C