Grants Lagoon Entrance Weather Forecast

    • 9
    • 22

    Partly cloudy

    • 15
    • 27

    Possible storm

    • 13
    • 20

    Possible shower. Windy

    • 8
    • 20

    Partly cloudy

    • 7
    • 21

    Sunny

    • 10
    • 25

    Sunny

    • 13
    • 26

    Becoming cloudy

Today 12 Dec St Helens

Partly cloudy. Winds northerly 15 to 20 km/h.

East of Flinders Island Coastal Waters

North Flinders Island to St Helens Point
Wind
Northeasterly 15 to 20 knots, reaching up to 30 knots offshore.
Seas
1 to 1.5 metres, increasing to 1.5 to 2.5 metres offshore.
1st Swell
Northeasterly around 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Weather
Mostly clear.
Weather Situation
A high pressure system lies over the Tasman Sea and extends a broad ridge over Tasmania. A weak cold front is expected to cross Tasmania during Saturday, ahead of a second stronger cold front to cross early Sunday. The next high pressure system in the Bight builds a ridge over western Tasmania during Tuesday. The high is forecast to move eastwards over Tasmania by late Monday and into the Tasman Sea on Tuesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Grants Lagoon Entrance Temperature Statistics View More

December Temperature

St Helens Aerodrome (9km)

  • Lowest 2 December, 2025

    6.6 °C

  • Average December

    15.4 °C

  • Highest 4 December, 2025

    27.3 °C

Climate (2020–Present)

St Helens Aerodrome (9km)

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  • Average Low 2020–2025

    9.3 °C

  • Average 2020–2025

    13.3 °C

  • Average High 2020–2025

    18.2 °C
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