Saint Mary Bay Weather Forecast

    • 15
    • 24

    Partly cloudy

    • 16
    • 22

    Partly cloudy

    • 14
    • 21

    Cloudy

    • 15
    • 22

    Partly cloudy

    • 13
    • 22

    Partly cloudy

    • 13
    • 24

    Sunny

    • 15
    • 31

    Sunny

Today 20 Dec West Coast

Partly cloudy. Slight chance of a shower late this afternoon and evening. Winds south to southeasterly 15 to 20 km/h tending south to southwesterly 25 to 35 km/h during the afternoon and evening. Daytime maximum temperatures 27 to 35.

Upper West Coastal Waters

Fowlers Bay to Elliston
Wind
Southeasterly 10 to 15 knots becoming variable below 10 knots in the late evening.
Seas
Below 1 metre.
1st Swell
Southerly 1.5 to 2 metres, decreasing to 1.5 metres by early evening, then tending south to southwesterly around 1 metre later in the evening.
Weather
Partly cloudy.
Weather Situation
A broad trough of low pressure lies over east and northern parts of the State. This area of low pressure is expected to linger over the northeast today before moving east Sunday with the next low pressure system that develops south of the bight. A high pressure ridge then extends over the west and south during Sunday, and throughout by Monday. A persistent high pressure ridge remains over the State and Coastal Waters during Tuesday and Wednesday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Saint Mary Bay Temperature Statistics View More

December Temperature

Streaky Bay (45km)

  • Lowest 7 December, 2025

    2.9 °C

  • Average December

    21.7 °C

  • Highest 18 December, 2025

    41.7 °C

Climate (2020–Present)

Streaky Bay (45km)

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  • Average Low 2020–2025

    12 °C

  • Average 2020–2025

    16.4 °C

  • Average High 2020–2025

    23.5 °C
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