Dianas Beach Weather Forecast

    • 6
    • 17

    Windy. Partly cloudy

    • 12
    • 23

    Wind easing. Sunny

    • 8
    • 23

    Becoming windy. Sunny

    • 9
    • 16

    Partly cloudy

    • 5
    • 16

    Partly cloudy

    • 5
    • 19

    Cloudy

    • 8
    • 18

    Shower or two

Today 18 Sep St Helens

Partly cloudy. Slight chance of a shower later tonight. Winds westerly 20 to 30 km/h tending northwesterly 30 to 45 km/h in the middle of the day.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Northwesterly 15 to 25 knots increasing to 20 to 30 knots in the morning. Winds reaching up to 35 knots offshore during the afternoon and evening.
Seas
1 to 1.5 metres, increasing to 2 to 3 metres during the morning.
1st Swell
Southerly 1 to 1.5 metres inshore, increasing to 2 to 3 metres offshore.
Weather
Mostly sunny.
Weather Situation
A high over western Victoria directs a westerly flow over Tasmania. Strong and gusty winds are forecast on Friday as a front passes well to the south of Tasmania. A weak ridge is forecast to extend over the state on Saturday, directing the flow northwesterly, before a cold front crosses the state on Sunday evening. The flow will turn southwesterly on Monday behind the front, as a high establishes over the Bight.
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

    11.7 °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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