Waterfall Bay (Port Arthur) Weather Forecast

    • 10
    • 21

    Rain

    • 11
    • 20

    Showers easing

    • 10
    • 17

    Shower or two

    • 10
    • 16

    Showers. Windy

    • 8
    • 15

    Showers. Windy

    • 9
    • 18

    Shower or two

    • 11
    • 20

    Partly cloudy

Today 21 Dec South East

Cloudy. Very high chance of rain, most likely later this evening. Winds northeast to southeasterly 15 to 25 km/h tending southeast to southwesterly 20 to 30 km/h in the evening.

South East Coastal Waters

Tasman Island to South East Cape
Wind
East to northeasterly 10 to 15 knots tending east to southeasterly in the evening. Winds reaching up to 20 knots near Cape Bruny in the late evening.
Seas
Around 1 metre.
1st Swell
Southwesterly around 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Weather
Cloudy. 80% chance of rain.
Weather Situation
A low pressure system over the southern mainland is expected to deepen and move to the east coast of Tasmania, before progressing further into the Tasman Sea by early Monday. A ridge of high pressure is expected to extend across the mainland during Monday to direct a westerly flow over Tasmania from Monday to Wednesday. Cold fronts embedded in this flow are expected to cross Tasmania late Monday and again Wednesday. This slow moving high pressure system then moves south of the Bight on Thursday to direct a more southerly flow over the state.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Waterfall Bay (Port Arthur) Temperature Statistics View More

December Temperature

Tasman Island (15km)

  • Lowest 7 December, 2025

    5.4 °C

  • Average December

    12.4 °C

  • Highest 4 December, 2025

    24.6 °C

Climate (2020–Present)

Tasman Island (15km)

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  • Average Low 2020–2025

    9.3 °C

  • Average 2020–2025

    11.5 °C

  • Average High 2020–2025

    14.5 °C
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