Dianas Basin Weather Forecast

    • 7
    • 16

    Partly cloudy

    • 10
    • 16

    Partly cloudy

    • 10
    • 15

    Shower or two

    • 5
    • 12

    Mostly sunny

    • 4
    • 14

    Partly cloudy

    • 9
    • 16

    Partly cloudy

    • 6
    • 16

    Partly cloudy

Today 20 Jul St Helens

Partly cloudy. Winds northwesterly 15 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 in the late morning.
Seas
1 to 2 metres.
1st Swell
Southerly around 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Weather
Partly cloudy.
Weather Situation
A high pressure centre over eastern Victoria moves east to be over the central Tasman Sea by Tuesday. A weak trough is expected to move over the west Monday evening, and the rest of the state during Tuesday, before a strong cold front is forecast to move over the state from the west on Wednesday afternoon. A strong west to southwesterly follows the front on Thursday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Basin Temperature Statistics View More

July Temperature

St Helens Aerodrome (5km)

  • Lowest 11 July, 2026

    3.4 °C

  • Average July

    9.5 °C

  • Highest 16 July, 2026

    17.2 °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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