Saint Mary Bay Weather Forecast

    • 14
    • 30

    Clear

    • 19
    • 35

    Sunny

    • 22
    • 38

    Sunny

    • 19
    • 24

    Partly cloudy

    • 16
    • 24

    Partly cloudy

    • 17
    • 21

    Partly cloudy

    • 15
    • 21

    Cloudy

Today 16 Dec West Coast

Clear. Winds northeast to southeasterly 15 to 25 km/h tending south to southeasterly 20 to 30 km/h in the evening then tending east to southeasterly 15 to 25 km/h in the late evening.

Upper West Coastal Waters

Fowlers Bay to Elliston
Wind
Southeasterly 10 to 15 knots.
Seas
Below 1 metre.
1st Swell
Southerly 1 to 1.5 metres.
Weather
Clear.
Weather Situation
A high pressure system to the south of the state will maintain a ridge across SA as it drifts into the Tasman by Wednesday. A trough of low pressure will briefly enter the far northeast of SA with another trough slowing moving across the south and west on Thursday. A south to southwesterly flow will establish across the coasts on Friday.
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  • Temperature Forecast Bureau of Meteorology

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Saint Mary Bay Temperature Statistics View More

December Temperature

Streaky Bay (45km)

  • Lowest 7 December, 2025

    2.9 °C

  • Average December

    21 °C

  • Highest 11 December, 2025

    38.6 °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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