Dianas Beach Weather Forecast
- 5
- 17
Partly cloudy
- 7
- 16
Mostly sunny
- 10
- 16
Cloudy
- 11
- 15
Shower or two
- 5
- 12
Sunny
- 6
- 15
Partly cloudy
- 9
- 15
Mostly sunny
Today 19 Jul St Helens
Partly cloudy. Light winds becoming northwesterly 15 to 20 km/h in the late evening.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- North to northwesterly about 10 knots increasing to 10 to 15 knots in the late afternoon. Winds reaching up to 20 knots offshore in the evening.
- Seas
- Below 1 metre, increasing to 1 to 1.5 metres offshore by early evening.
- 1st Swell
- Southerly 1 to 1.5 metres inshore, increasing to 1 to 2 metres offshore.
- Weather
- Partly cloudy.
- Weather Situation
- A west to northwesterly airstream will prevail over the state until Monday as a near stationary high pressure centre over Victoria extends a weak ridge over Tasmania. A weak trough is expected to move over the west Monday evening, and the rest of the state during Tuesday, before a strong cold front is forecast to arrive Wednesday afternoon.
Dianas Beach Temperature Statistics View More
July Temperature
St Helens Aerodrome (5km)
Lowest 11 July, 2026
3.4 °CAverage July
9.6 °CHighest 16 July, 2026
17.2 °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