Dianas Basin Weather Forecast
- 6
- 17
Mostly sunny
- 7
- 18
Shower or two. Becoming windy
- 7
- 16
Partly cloudy
- 11
- 16
Showers. Becoming windy
- 7
- 16
Shower or two
- 9
- 16
Showers
- 5
- 16
Possible shower
Today 31 Aug St Helens
Mostly sunny. Light winds.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- Northeasterly 10 to 15 knots turning north to northwesterly in the evening. Winds reaching up to 20 knots offshore in the late evening.
- Seas
- Around 1 metre.
- 1st Swell
- Southerly 1 to 1.5 metres inshore, increasing to 1.5 to 2.5 metres offshore.
- Weather
- Mostly sunny.
- Weather Situation
- A high pressure ridge extends over the southern mainland maintaining a westerly flow over Tasmania today, before the high centre drifts into the Tasman Sea later tonight. A cold front is expected to approach from the west and cross Tasmania on Tuesday, followed by persistent westerly flow for the remainder of the week. A cold front embedded in the westerly flow is forecast to cross during Thursday.
Dianas Basin Temperature Statistics View More
August Temperature
St Helens Aerodrome (5km)
Lowest 23 August, 2026
2.5 °CAverage August
10.9 °CHighest 29 August, 2026
19.4 °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