Dianas Basin Weather Forecast
- 5
- 15
Showers
- 5
- 13
Shower or two
- 5
- 13
Shower or two
- 3
- 15
Mostly sunny
- 3
- 14
Possible shower
- 6
- 15
Showers
- 2
- 12
Shower or two
Today 8 Jul St Helens
Cloudy. Very high chance of showers, becoming less likely later tonight. Winds northerly 20 to 30 km/h tending northwesterly 15 to 25 km/h in the late evening.
Upper East Coastal Waters
St Helens Point to Wineglass Bay- Wind
- Northerly 20 to 25 knots, reaching up to 30 knots in the evening. Winds turning northwesterly 15 to 25 knots in the evening.
- Seas
- 2 to 2.5 metres.
- 1st Swell
- Easterly below 1 metre.
- Weather
- Cloudy. 80% chance of showers.
- Weather Situation
- A cold front over Tasmania will move away to the east this evening. A second cold front will approach from the west later on Wednesday and is forecast to cross Tasmania during Thursday morning. A southwesterly flow will develop over Tasmania on Thursday afternoon and evening, before a weak cold front is forecast to clip the south of the state on Friday. A high pressure system over mainland Australia is expected to extend a ridge over Tasmania early Saturday, with a northwesterly stream to develop on Saturday afternoon.
Dianas Basin Temperature Statistics View More
July Temperature
St Helens Aerodrome (5km)
Lowest 1 July, 2025
1.7 °CAverage July
8.9 °CHighest 6 July, 2025
15.7 °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