Dianas Beach Weather Forecast

    • 8
    • 19

    Cloudy

    • 12
    • 21

    Partly cloudy

    • 11
    • 22

    Sunny

    • 13
    • 23

    Partly cloudy

    • 12
    • 19

    Partly cloudy

    • 10
    • 20

    Mostly sunny

    • 11
    • 21

    Partly cloudy

Today 27 Dec St Helens

Partly cloudy. Winds southeasterly 20 to 30 km/h decreasing to 15 to 20 km/h in the late evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Southerly 15 to 25 knots decreasing to 10 to 15 knots in the late evening.
Seas
1.5 to 2 metres.
1st Swell
Southerly 1 to 1.5 metres inshore, increasing to 2 to 2.5 metres offshore.
Weather
Partly cloudy.
Weather Situation
A high pressure system will pass the south of Tasmania tonight, and reside over Tasman Sea on Sunday and Monday. The high centre is expected to weaken during Tuesday as a trough approaches the west coast slowly during the day, to cross Tasmania in the evening. The trough is then forecast to clear to the northeast during Wednesday while a new ridge of high pressure moves over Tasmania from the west.
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 25 December, 2025

    6.4 °C

  • Average December

    15.7 °C

  • Highest 17 December, 2025

    29.5 °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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