Dianas Basin Weather Forecast

    • 13
    • 20

    Partly cloudy

    • 8
    • 16

    Shower or two

    • 5
    • 15

    Partly cloudy

    • 3
    • 19

    Sunny

    • 5
    • 19

    Mostly sunny

    • 13
    • 22

    Mostly sunny

    • 13
    • 23

    Partly cloudy

Today 14 Sep St Helens

Partly cloudy. Slight chance of a shower, most likely later tonight. Winds northwesterly 25 to 35 km/h decreasing to 15 to 20 km/h in the late evening.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Northwesterly 20 to 25 knots, reaching up to 30 knots offshore during the afternoon and evening.
Seas
1 to 1.5 metres, increasing to 2 to 2.5 metres offshore.
1st Swell
Southerly below 1 metre.
Weather
Mostly clear.
Weather Situation
A cold front approaches the state from the west today, crossing Tasmania overnight. A southwesterly flow is expected to develop over Tasmania from Tuesday, as a high in the Bight is forecast to extend a ridge over the state on Wednesday. Flow is expected to turn westerly Thursday as the high moves over Victoria. Strong northwesterly winds are expected on Friday ahead of an approaching trough.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Basin Temperature Statistics View More

September Temperature

St Helens Aerodrome (5km)

  • Lowest 8 September, 2026

    3.5 °C

  • Average September

    11.8 °C

  • Highest 10 September, 2026

    22.2 °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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