Grantham Island Weather Forecast

    • 6
    • 15

    Mostly sunny

    • 5
    • 17

    Mostly sunny

    • 9
    • 19

    Showers increasing

    • 7
    • 16

    Mostly sunny

    • 6
    • 16

    Partly cloudy

    • 7
    • 21

    Possible shower

    • 11
    • 17

    Showers

Today 9 Aug Port Lincoln

Mostly sunny. Winds easterly 15 to 20 km/h becoming light before dawn.

Spencer Gulf Coastal Waters

Wind
Variable about 10 knots.
Seas
Below 1 metre.
1st Swell
South to southwesterly below 1 metre, increasing to 1 to 1.5 metres south of Cowell to Wallaroo.
Weather
Mostly sunny.
Weather Situation
A large high pressure system near Tasmania slowly moves into the Tasman Sea by Sunday, with a weakening ridge extending over SA. A cold front moving across the Bight on Monday will weaken as it moves across SA, and will be replaced quickly by a ridge of high pressure on Tuesday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Grantham Island Temperature Statistics View More

August Temperature

Port Lincoln Airport (19km)

  • Lowest 3 August, 2025

    3.7 °C

  • Average August

    11.3 °C

  • Highest 5 August, 2025

    17.1 °C

Climate (2020–Present)

Port Lincoln Airport (19km)

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  • Average Low 2020–2025

    11.4 °C

  • Average 2020–2025

    15.8 °C

  • Average High 2020–2025

    21.3 °C
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