Granite Island Weather Forecast

    • 13
    • 23

    Showers increasing

    • 13
    • 20

    Showers

    • 10
    • 17

    Shower or two

    • 8
    • 16

    Partly cloudy

    • 8
    • 17

    Cloudy

    • 7
    • 20

    Partly cloudy

    • 9
    • 16

    Shower or two

Today 30 Sep Mount Lofty Ranges

Cloudy. Medium chance of showers, most likely this evening. The chance of a thunderstorm this evening. Light winds becoming northwesterly 15 to 20 km/h in the middle of the day then becoming light in the early afternoon. Daytime maximum temperatures in the low to mid 20s.

South Central Coastal Waters

Wind
West to northwesterly about 10 knots.
Seas
Below 1 metre.
1st Swell
Southwesterly 2 to 2.5 metres.
Weather
Cloudy. 90% chance of showers. The chance of a thunderstorm.
Weather Situation
A series of slow moving troughs will move across the state today and Thursday as a couple of cold fronts move across waters to the south. A high pressure system will become established south of the Bight during Friday and persist there on Saturday. A trough will extend from WA over the far west of SA over the weekend.
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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

    14.7 °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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