Brother and Sister Weather Forecast
- 6
- 13
Shower or two
- 8
- 13
Partly cloudy
- 9
- 15
Showers increasing
- 5
- 10
Showers easing
- 5
- 12
Shower or two
- 8
- 12
Shower or two
- 7
- 13
Shower or two
Today 11 Jul South East
Partly cloudy. High chance of showers, most likely in the late morning. Snow falling above 600 metres. Possible small hail in the late afternoon and evening. The chance of a thunderstorm in the far south in the afternoon. Thunderstorms possibly severe with damaging winds. Winds northwesterly 20 to 30 km/h tending westerly 30 to 45 km/h in the middle of the day. Daytime maximum temperatures between 8 and 12.
Storm Bay
- Wind
- Northwesterly 15 to 20 knots shifting westerly 20 to 30 knots in the early afternoon then decreasing to 20 to 25 knots in the late afternoon.
- Seas
- Below 1 metre, increasing to 1 to 2 metres during the afternoon.
- Weather
- Partly cloudy. 70% chance of showers, with possible small hail in the evening.
- Weather Situation
- Tasmania sits in a westerly flow with an embedded cold front approaching, forecast to brush the west and south of the state during today. A high pressure system over mainland Australia is expected to extend a ridge over Tasmania early tomorrow. A northwesterly stream is forecast to develop on Saturday afternoon, ahead of a stronger cold front to cross the state Sunday afternoon and evening. A weak ridge is forecast to move over the state on Monday.
Brother and Sister Temperature Statistics View More
July Temperature
Tasman Island (26km)
Lowest 9 July, 2025
6.4 °CAverage July
9.5 °CHighest 6 July, 2025
13.9 °C
Climate (2020–Present)
Tasman Island (26km)
Average Low 2020–2025
9.4 °CAverage 2020–2025
11.5 °CAverage High 2020–2025
14.6 °C