Dianas Beach Weather Forecast
- 6
- 16
Showers
- 9
- 13
Showers
- 9
- 16
Shower or two
- 8
- 15
Shower or two
- 5
- 16
Partly cloudy
- 6
- 17
Partly cloudy
- 6
- 13
Partly cloudy
Today 9 Aug St Helens
Cloudy. High chance of showers, most likely later this evening. Winds northerly 15 to 20 km/h becoming light in the late afternoon.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- Northerly 15 to 20 knots, reaching up to 25 knots offshore in the late afternoon.
- Seas
- 1 to 1.5 metres, increasing to 1.5 to 2 metres offshore.
- 1st Swell
- Northeast to southeasterly below 1 metre, tending north to northeasterly 1 to 1.5 metres by early evening, then increasing to 1.5 to 2 metres later in the evening.
- Weather
- Cloudy. 80% chance of showers.
- Weather Situation
- A low deepens over southeastern South Australia today and is forecast to move over western Bass Strait Monday morning. The low moves further east to be off the northeast coast of Tasmania in the evening. A weak ridge is expected to cross over the state during Tuesday before a cold front arrives during Wednesday morning. A high is forecast to move over the mainland directing a westerly flow over Tasmania on Thursday.
Dianas Beach Temperature Statistics View More
August Temperature
St Helens Aerodrome (5km)
Lowest 1 August, 2026
3 °CAverage August
8.6 °CHighest 6 August, 2026
16.3 °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