Dianas Beach Weather Forecast

    • 8
    • 20

    Cloudy

    • 12
    • 20

    Shower or two

    • 13
    • 23

    Sunny

    • 10
    • 20

    Mostly sunny

    • 9
    • 19

    Mostly sunny

    • 9
    • 21

    Partly cloudy

    • 14
    • 25

    Shower or two

Today 7 Dec St Helens

Cloudy. Winds northwesterly 20 to 25 km/h.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Northwesterly 15 to 20 knots, reaching up to 30 knots offshore.
Seas
1 to 1.5 metres, increasing to 1 to 2 metres offshore.
1st Swell
South to southwesterly around 1 metre offshore.
Weather
Cloudy.
Weather Situation
A westerly flow over Tasmania on Sunday, shifting northwesterly on Monday ahead of a cold front crossing the state during the day. Westerly flow behind the cold front then persists on Tuesday, with a trough of low pressure embedded in the westerly flow moving over the state. A high pressure system south of the Bight then extends a ridge over Bass Strait, with another cold front clipping the south later Wednesday. The high moves eastwards to be centred east of Tasmania later Thursday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Beach Temperature Statistics View More

December Temperature

St Helens Aerodrome (5km)

  • Lowest 2 December, 2025

    6.6 °C

  • Average December

    15.6 °C

  • Highest 4 December, 2025

    27.3 °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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