Dianas Basin Weather Forecast

    • 12
    • 22

    Partly cloudy

    • 12
    • 21

    Partly cloudy

    • 9
    • 19

    Possible shower

    • 8
    • 19

    Cloudy

    • 8
    • 19

    Mostly sunny

    • 10
    • 21

    Partly cloudy

    • 11
    • 22

    Sunny

Today 23 Dec St Helens

Partly cloudy. Winds west to northwesterly 15 to 25 km/h tending west to southwesterly in the early morning then tending west to northwesterly 20 to 30 km/h in the late afternoon.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
West to southwesterly 15 to 20 knots tending east to northeasterly 10 to 15 knots in the late afternoon then tending northwesterly 15 to 20 knots in the evening. Winds reaching up to 30 knots offshore in the evening.
Seas
1 to 2 metres, decreasing to 1 to 1.5 metres around midday, then increasing to 1 to 2 metres by early evening.
1st Swell
South to southwesterly below 1 metre inshore, increasing to 1 to 2 metres offshore during the afternoon.
Weather
Partly cloudy.
Weather Situation
A cold front crossed the state early this morning, with another front crossing tomorrow. A high pressure system then slowly moves over the state from Thursday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Basin Temperature Statistics View More

December Temperature

St Helens Aerodrome (5km)

  • Lowest 2 December, 2025

    6.6 °C

  • Average December

    16 °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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