Onion Creek Entrance Weather Forecast

    • 9
    • 16

    Mostly sunny

    • 4
    • 19

    Sunny

    • 6
    • 20

    Sunny

    • 6
    • 19

    Mostly sunny

    • 8
    • 17

    Showers increasing

    • 9
    • 18

    Partly cloudy

    • 9
    • 17

    Shower or two

Today 28 Aug St Helens

Mostly sunny. Light winds.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
Northwest to southwesterly 10 to 15 knots, reaching up to 20 knots offshore during the morning. Winds tending southwesterly in the middle of the day then tending northwest to southwesterly in the evening.
Seas
1 to 2 metres, decreasing to 1 metre during the afternoon.
1st Swell
Southerly below 1 metre inshore, increasing to 1 to 1.5 metres offshore by early evening.
Weather
Mostly sunny.
Weather Situation
An approaching cold front will cross the state on Friday morning. A high pressure system will build south of the Bight on Saturday and extend a ridge to the north of Tasmania, with the high centre to move near Adelaide on Sunday and extend a ridge over Tasmania. The high is expected to move to the north of Tasmania on Monday, with another cold front to move to the south of the Bight.
Graph Plots Open in Graphs
  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Onion Creek Entrance Temperature Statistics View More

August Temperature

St Helens Aerodrome (3km)

  • Lowest 23 August, 2026

    2.5 °C
  • Average August

    10.7 °C
  • Highest 13 August, 2026

    19.2 °C

Climate (2021–2026)

St Helens Aerodrome (3km)

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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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