Granite Island Weather Forecast

    • 11
    • 16

    Cloudy

    • 8
    • 16

    Partly cloudy

    • 8
    • 24

    Partly cloudy

    • 16
    • 31

    Becoming cloudy

    • 13
    • 21

    Showers

    • 11
    • 21

    Showers

    • 8
    • 16

    Partly cloudy

Today 26 Sep Mount Lofty Ranges

Cloudy. Slight chance of a shower. Winds southeasterly 25 to 40 km/h.

South Central Coastal Waters

Wind
Southeasterly 20 to 30 knots.
Seas
2 metres.
1st Swell
Southwesterly 3 metres.
Weather
Cloudy.
Weather Situation
A trough over central Australia will weaken and contract into WA as a ridge of high pressure extends across southern SA on Sunday. The high pressure system is expected to drift into the Tasman Sea by Tuesday as the trough in WA begins to re-extend over western SA on Tuesday, pushing into the state on Wednesday.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Granite Island Temperature Statistics View More

September Temperature

Encounter Bay (2km)

  • Lowest 18 September, 2026

    2 °C

  • Average September

    14.6 °C

  • Highest 19 September, 2026

    26.5 °C

Climate (2021–2026)

Encounter Bay (2km)

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  • Average Low 2021–2026

    10.5 °C

  • Average 2021–2026

    15.3 °C

  • Average High 2021–2026

    20.7 °C
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