Dianas Beach Weather Forecast

    • 8
    • 16

    Windy. Mostly sunny

    • 3
    • 17

    Cloud clearing

    • 4
    • 19

    Sunny

    • 7
    • 20

    Partly cloudy

    • 12
    • 24

    Shower or two

    • 12
    • 17

    Shower or two

    • 8
    • 15

    Cloudy

Today 21 Sep St Helens

Mostly sunny. Damaging winds possible. Winds west to southwesterly 15 to 25 km/h becoming light in the evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Southwesterly 15 to 25 knots, reaching up to 30 knots offshore during the morning. Winds turning westerly in the early afternoon.
Seas
2 to 3 metres, decreasing to 1 to 2 metres around midday.
1st Swell
South to southwesterly around 1 metre inshore, increasing to 1.5 to 2.5 metres offshore.
Weather
Partly cloudy.
Weather Situation
In the wake of a cold front a high will establish over the Bight today, with the high expected to move to the north of Tasmania on Tuesday morning and lie over the northern Tasman Sea during Wednesday and Thursday.
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 17 September, 2026

    2.2 °C

  • Average September

    12.3 °C

  • Highest 19 September, 2026

    23.5 °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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