Dianas Basin Weather Forecast
- 7
- 13
Showers developing. Windy
- 5
- 14
Sunny
- 3
- 15
Mostly sunny
- 8
- 17
Showers increasing
- 7
- 14
Shower or two
- 3
- 14
Mostly sunny
- 3
- 15
Shower or two
Today 19 Jul St Helens
Partly cloudy. High chance of showers, most likely during this afternoon and evening. Damaging winds possible, easing in the evening. Winds northwesterly 35 to 50 km/h.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- North to northwesterly20 to 30 knots, reaching 25 to 35 knots in the late morning and afternoon. Winds then tending northwesterly 20 to 30 knots in the evening.
- Seas
- 2 to 2.5 metres, increasing to 2.5 to 4 metres during the morning.
- 1st Swell
- Southerly around 1 metre.
- Weather
- Partly cloudy. 60% chance of showers.
- Weather Situation
- A northwesterly airstream persists over Tasmania ahead of a strong cold front, expected to cross the state from the west on Saturday. A high pressure system over mainland Australia extends a weak ridge over the Tasmania on Sunday, before moving into the Tasman Sea during Monday.
Dianas Basin Temperature Statistics View More
July Temperature
St Helens Aerodrome (5km)
Lowest 12 July, 2025
0 °CAverage July
8.9 °CHighest 7 July, 2025
16.6 °C
Climate (2020–Present)
St Helens Aerodrome (5km)
Average Low 2020–2025
9.4 °CAverage 2020–2025
13.3 °CAverage High 2020–2025
18.2 °C