Seal Island Weather Forecast

    • 11
    • 21

    Shower or two

    • 11
    • 18

    Mostly sunny

    • 8
    • 17

    Mostly sunny

    • 8
    • 20

    Mostly sunny

    • 10
    • 22

    Sunny

    • 12
    • 22

    Possible shower developing

    • 15
    • 21

    Showers

Today 21 May Perth

Partly cloudy. Medium chance of showers. The chance of a thunderstorm. Winds southwesterly 20 to 30 km/h turning southerly 15 to 20 km/h in the evening.

Perth Local Waters

Two Rocks to Dawesville, inshore from Rottnest Island
Wind
Southwesterly 10 to 15 knots turning southerly 15 to 25 knots in the early afternoon. Winds reaching up to 30 knots in the evening.
Seas
Below 1 metre, increasing to 1 to 1.5 metres during the afternoon, then increasing to 1.5 to 2 metres by early evening.
1st Swell
Southwesterly 1.5 to 2 metres.
Weather
Partly cloudy. 80% chance of showers. The chance of a thunderstorm.
Weather Situation
A weak cold front will move across the area during this afternoon and early evening, ahead of a new ridge arriving on Friday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Seal Island Temperature Statistics View More

May Temperature

Garden Island (5km)

  • Lowest 17 May, 2026

    8.4 °C

  • Average May

    16.8 °C

  • Highest 11 May, 2026

    26.2 °C

Climate (2021–Present)

Garden Island (5km)

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  • Average Low 2021–2026

    15.1 °C

  • Average 2021–2026

    18.9 °C

  • Average High 2021–2026

    23.3 °C
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