Dianas Beach Weather Forecast

    • 4
    • 15

    Sunny

    • 3
    • 16

    Sunny

    • 4
    • 19

    Partly cloudy

    • 12
    • 22

    Shower or two

    • 12
    • 20

    Showers

    • 10
    • 16

    Shower or two

    • 7
    • 16

    Partly cloudy

Today 27 Sep St Helens

Sunny. Winds easterly 15 to 20 km/h tending northeasterly in the early afternoon then becoming light in the late afternoon.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
South to southwesterly 10 to 15 knots tending northwest to southwesterly in the evening.
Seas
1 to 1.5 metres, decreasing below 1 metre during the afternoon.
1st Swell
Southerly 1.5 to 2.5 metres.
Weather
Mostly sunny.
Weather Situation
A high pressure system centred well to the west of Tasmania extends a ridge over the state. The high centre is forecast to move across the state tomorrow before moving over the Tasman Sea during Tuesday. Northerly flow is expected to build during Tuesday over Tasmania ahead of an approaching trough, forecast to cross during early Wednesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Beach Temperature Statistics View More

September Temperature

St Helens Aerodrome (5km)

  • Lowest 22 September, 2026

    1.7 °C

  • Average September

    12.4 °C

  • Highest 20 September, 2026

    23.6 °C

Climate (2021–2026)

St Helens Aerodrome (5km)

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  • Average Low 2021–2026

    9.4 °C

  • Average 2021–2026

    13.4 °C

  • Average High 2021–2026

    18.4 °C
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