Grantham Island Weather Forecast

    • 7
    • 24

    Clear

    • 8
    • 18

    Showers. Becoming windy

    • 8
    • 16

    Possible shower

    • 10
    • 18

    Shower or two

    • 9
    • 17

    Partly cloudy

    • 8
    • 17

    Partly cloudy

    • 7
    • 19

    Partly cloudy

Today 18 Sep Port Lincoln

Clear. Winds westerly 15 to 25 km/h becoming light in the evening.

Spencer Gulf Coastal Waters

Wind
West to southwesterly 10 to 15 knots.
Seas
Below 1 metre.
1st Swell
South to southwesterly around 1 metre south of Cowell to Wallaroo.
Weather
Clear.
Weather Situation
A high pressure system lies over the Tasman Sea with a ridge extending into the east of the state. A weak trough over South Australian waters will continue moving through eastern waters tonight. A cold front will pass over the south during Friday afternoon with a southwesterly flow persisting through the weekend as a ridge of high pressure extends over northern parts of the state.
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  • Temperature Forecast Bureau of Meteorology

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Grantham Island Temperature Statistics View More

September Temperature

Port Lincoln Airport (19km)

  • Lowest 2 September, 2025

    4 °C

  • Average September

    12.9 °C

  • Highest 6 September, 2025

    27.5 °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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