Dianas Beach Weather Forecast

    • 4
    • 21

    Partly cloudy

    • 12
    • 23

    Shower or two

    • 9
    • 15

    Showers

    • 6
    • 14

    Mostly sunny

    • 5
    • 15

    Mostly sunny

    • 7
    • 19

    Mostly sunny

    • 9
    • 21

    Shower or two

Today 24 Sep St Helens

Partly cloudy. Slight chance of a shower later tonight. Light winds becoming north to northeasterly 15 to 20 km/h in the middle of the day then tending north to northwesterly in the early afternoon.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Variable about 10 knots becoming northerly 15 to 20 knots in the middle of the day.
Seas
Below 1 metre, increasing to 1 to 2 metres during the afternoon.
1st Swell
Southerly around 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Weather
Partly cloudy.
Weather Situation
A ridge extending over Tasmania from a high pressure system in the Tasman Sea will weaken today, as a trough approaches from the west in the evening. Another weak trough is forecast to move over the state from the west during Friday ahead of a cold front to cross later. A secondary high pressure system is forecast to extend a ridge over Tasmania from the southwest during Saturday, and move over on Sunday.
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

    12.1 °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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