Dianas Beach Weather Forecast

    • 11
    • 22

    Possible shower

    • 8
    • 20

    Partly cloudy

    • 11
    • 20

    Shower or two

    • 13
    • 23

    Partly cloudy

    • 9
    • 21

    Partly cloudy

    • 9
    • 19

    Mostly sunny

    • 9
    • 21

    Mostly sunny

Today 6 Dec St Helens

Partly cloudy. Medium chance of showers, becoming less likely later tonight. Winds west to northwesterly 25 to 35 km/h.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Northwesterly 15 to 25 knots shifting south to southwesterly in the late afternoon then tending west to southwesterly 15 to 20 knots in the late evening. Winds reaching up to 30 knots during the afternoon and evening.
Seas
1 to 1.5 metres, increasing to 1.5 to 2.5 metres offshore.
1st Swell
Southerly around 1 metre.
Weather
Cloudy. 70% chance of showers.
Weather Situation
A cold front crossing the State will clear to the east Saturday evening. A westerly flow is then expected to develop over Tasmania on Sunday and persist into Tuesday, with an embedded cold front to cross the state on Monday. A high pressure system south of the Bight extends a ridge over Bass Strait, with another cold front clipping the south later Wednesday.
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

    15.4 °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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