Granite Island Weather Forecast
- 11
- 19
Shower or two
- 9
- 18
Cloudy
- 8
- 19
Showers
- 8
- 16
Shower or two
- 10
- 18
Showers
- 11
- 19
Shower or two
- 10
- 19
Possible shower
Today 4 May Mount Lofty Ranges
Partly cloudy. Medium chance of showers, becoming less likely later this evening. Winds west to southwesterly 20 to 30 km/h decreasing to 15 to 20 km/h in the evening.
South Central Coastal Waters
- Wind
- Southwesterly 15 to 25 knots.
- Seas
- 1.5 to 2 metres.
- 1st Swell
- Southwesterly 3 metres.
- Weather
- Partly cloudy.
- Weather Situation
- A low pressure system in Bass Strait and associated trough will clear eastwards, weakening their influence of SA by Monday evening. A ridge of high pressure will begin to extend from the west on Tuesday and will be briefly be weakened as a cold front crosses the southeast on Wednesday afternoon. The ridge will begin to re-establish in the wake of the front and stabilise over SA with the slow moving high pressure centre sitting south of WA by Friday.
Granite Island Temperature Statistics View More
May Temperature
Encounter Bay (2km)
Lowest 3 May, 2026
12.4 °CAverage May
20.5 °CHighest 1 May, 2026
29.7 °C
Climate (2021–Present)
Encounter Bay (2km)
Average Low 2021–2026
10.5 °CAverage 2021–2026
15.2 °CAverage High 2021–2026
20.7 °C