Grantham Island Weather Forecast

    • 15
    • 20

    Possible shower

    • 14
    • 19

    Cloudy

    • 15
    • 21

    Cloudy

    • 16
    • 25

    Partly cloudy

    • 18
    • 28

    Mostly sunny

    • 19
    • 29

    Possible shower developing

    • 17
    • 24

    Shower or two

Today 26 Mar Port Lincoln

Cloudy. Medium chance of showers, becoming less likely late this afternoon and evening. Winds southerly 25 to 40 km/h.

Spencer Gulf Coastal Waters

Wind
Southerly 15 to 25 knots, reaching up to 30 knots during the afternoon and evening.
Seas
1.5 metres, increasing to 1.5 to 2.5 metres during the morning.
1st Swell
South to southwesterly below 1 metre, increasing to 1 to 2 metres south of Cowell to Wallaroo during the morning.
Weather
Partly cloudy. 50% chance of showers. The chance of a thunderstorm in the early morning.
Weather Situation
A broad trough lies over eastern SA. A cold front will clip the southeast tomorrow as a high pressure system starts to build south of the Bight. The high will become established south of SA by Friday before starting to move east towards the Tasman Sea on Sunday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Grantham Island Temperature Statistics View More

March Temperature

Port Lincoln Airport (19km)

  • Lowest 21 March, 2026

    11.4 °C

  • Average March

    19 °C

  • Highest 10 March, 2026

    34.6 °C

Climate (2021–Present)

Port Lincoln Airport (19km)

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  • Average Low 2021–2026

    11.4 °C

  • Average 2021–2026

    15.8 °C

  • Average High 2021–2026

    21.3 °C
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