Dianas Beach Weather Forecast

    • 5
    • 17

    Mostly sunny

    • 8
    • 20

    Partly cloudy

    • 13
    • 21

    Partly cloudy

    • 9
    • 16

    Shower or two

    • 5
    • 16

    Partly cloudy

    • 5
    • 19

    Sunny

    • 7
    • 19

    Partly cloudy

Today 12 Sep St Helens

The chance of morning fog. Sunny afternoon. Light winds becoming northeasterly 15 to 20 km/h in the early afternoon then becoming light in the evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Variable about 10 knots becoming northeasterly 10 to 15 knots in the early afternoon then tending northerly in the evening. Winds reaching up to 20 knots offshore in the late evening.
Seas
Below 0.5 metres, increasing to around 1 metre during the afternoon.
1st Swell
Southerly 1.5 to 2.5 metres.
Weather
Mostly sunny.
Weather Situation
A high pressure system over southern Victoria is forecast to move over the Tasman Sea early today and continue to slowly move east. A weak trough is expected to cross Tasmania late Sunday. A cold front is then expected to approach the state from the west on Monday, directing the flow northwesterly before crossing Tasmania overnight into early Tuesday. A southwesterly flow will establish over the state in its wake.
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 8 September, 2026

    3.5 °C

  • Average September

    11.9 °C

  • Highest 10 September, 2026

    22.2 °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

    18.3 °C
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