Granite Island Weather Forecast

    • 11
    • 23

    Possible shower

    • 9
    • 15

    Cloudy

    • 5
    • 19

    Sunny

    • 7
    • 23

    Sunny

    • 11
    • 27

    Partly cloudy

    • 13
    • 25

    Partly cloudy

    • 12
    • 19

    Partly cloudy

Today 20 Sep Mount Lofty Ranges

Partly cloudy. Slight chance of a shower, most likely later this evening. Winds westerly 25 to 40 km/h turning southwesterly 20 to 30 km/h in the late evening.

South Central Coastal Waters

Wind
Westerly 20 to 25 knots turning southwesterly in the evening. Winds reaching up to 30 knots in the evening.
Seas
2 metres.
1st Swell
Southwesterly 2 to 3 metres.
Weather
Cloudy.
Weather Situation
A trough and cold front will move to the east of SA later Sunday. A high pressure system will move eastwards across waters to the south during Monday then over Victoria and the Tasman Sea on Tuesday. This high will extend a ridge westwards over SA ahead of a low pressure trough that is expected to move over the far west of SA during Wednesday. The trough will slip southeastwards over the Bight during Thursday.
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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

    14.2 °C

  • Highest 12 September, 2026

    24.4 °C

Climate (2021–2026)

Encounter Bay (2km)

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  • Average Low 2021–2026

    10.5 °C

  • Average 2021–2026

    15.2 °C

  • Average High 2021–2026

    20.6 °C
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