Dianas Basin Weather Forecast

    • 14
    • 27

    Becoming windy. Sunny

    • 12
    • 20

    Mostly sunny

    • 11
    • 22

    Possible late shower

    • 8
    • 20

    Partly cloudy

    • 11
    • 19

    Shower or two

    • 11
    • 22

    Partly cloudy

    • 9
    • 21

    Sunny

Today 4 Dec St Helens

Sunny. Damaging winds possible. Winds north to northwesterly 30 to 45 km/h increasing to 50 km/h before turning westerly 25 to 40 km/h in the evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
North to northwesterly 20 to 25 knots, reaching up to 30 knots offshore in the afternoon. Winds tending west to northwesterly 15 to 25 knots during the afternoon and evening.
Seas
1 to 2 metres, increasing to 2 to 3 metres offshore.
1st Swell
South to southwesterly below 1 metre.
Weather
Mostly sunny.
Weather Situation
A high pressure system over the Tasman Sea directs a northwesterly flow over the state, strengthening ahead of a weak cold front to cross Tasmania today. A weak ridge passes over the state on Friday, before another cold front is forecast to cross the state on Saturday. A westerly flow is then expected to develop over Tasmania on Sunday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Basin Temperature Statistics View More

December Temperature

St Helens Aerodrome (5km)

  • Lowest 2 December, 2025

    6.6 °C

  • Average December

    13 °C

  • Highest 2 December, 2025

    18.8 °C

Climate (2020–Present)

St Helens Aerodrome (5km)

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  • Average Low 2020–2025

    9.3 °C

  • Average 2020–2025

    13.3 °C

  • Average High 2020–2025

    18.2 °C
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