Dianas Basin Weather Forecast

    • 13
    • 24

    Partly cloudy

    • 13
    • 18

    Shower or two

    • 14
    • 26

    Morning shower or two

    • 12
    • 21

    Showers increasing

    • 13
    • 23

    Shower or two

    • 11
    • 20

    Shower or two

    • 10
    • 21

    Partly cloudy

Today 18 Dec St Helens

Partly cloudy. Slight chance of a light shower in the afternoon and early evening. Light winds becoming southerly 15 to 25 km/h in the late evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Southeasterly 10 to 15 knots tending northeast to southeasterly in the middle of the day.
Seas
Below 1 metre.
1st Swell
Southerly below 1 metre inshore, increasing to around 1 metre offshore.
Weather
Partly cloudy.
Weather Situation
A trough approaches from the southwest today and is forecast to cross the state during this afternoon. A weak ridge is then expected to pass to the south on Friday, before a low pressure system moves over the state on Saturday, lingering about the east coast on Sunday.
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

    15.7 °C

  • Highest 4 December, 2025

    27.3 °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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