Dianas Beach Weather Forecast
- 8
- 17
Partly cloudy
- 9
- 16
Early shower or two
- 3
- 16
Mostly sunny
- 9
- 17
Possible shower
- 8
- 14
Shower or two
- 8
- 15
Shower or two
- 5
- 17
Mostly sunny
Today 21 Aug St Helens
Partly cloudy. Winds northwesterly 15 to 20 km/h.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- Northwesterly 15 to 20 knots, reaching up to 30 knots offshore.
- Seas
- 1 to 1.5 metres, increasing to 1.5 to 2.5 metres offshore.
- 1st Swell
- Northerly around 1 metre.
- Weather
- Mostly clear.
- Weather Situation
- A cold front embedded in a vigorous westerly stream will approach and cross Tasmania on Saturday morning, with high pressure system to build to the north of the state and extend a ridge over Tasmania in the evening. The high will move slowly move to the north of Tasmania on Sunday and over the northern Tasman Sea by Sunday evening, with another cold front to approach and cross the state on Monday. On Tuesday a ridge of high pressure is expected to extend over Tasmania, with a low pressure system to move from central Australia over southern New South Wales.
Dianas Beach Temperature Statistics View More
August Temperature
St Helens Aerodrome (5km)
Lowest 1 August, 2026
3 °CAverage August
10.5 °CHighest 13 August, 2026
19.2 °C
Climate (2021–2026)
St Helens Aerodrome (5km)
Average Low 2021–2026
9.4 °CAverage 2021–2026
13.4 °CAverage High 2021–2026
18.3 °C