Bay of Islands Weather Forecast

    • 7
    • 26

    Shower or two. Becoming windy

    • 5
    • 13

    Showers easing. Windy

    • 7
    • 15

    Partly cloudy

    • 5
    • 17

    Partly cloudy

    • 6
    • 18

    Partly cloudy

    • 10
    • 21

    Showers

    • 9
    • 13

    Shower or two

Today 20 Sep South East

Mostly sunny. High chance of showers in the south, medium chance elsewhere. Snow falling above 1000 metres. Possible small hail in the far south at night. Damaging winds possible. Winds northwesterly 40 to 60 km/h turning westerly 35 to 55 km/h in the evening. Daytime maximum temperatures 22 to 27.

South East Coastal Waters

Tasman Island to South East Cape
Wind
North to northwesterly 20 to 30 knots turning westerly 25 to 40 knots in the early afternoon.
Seas
1.5 to 2 metres, increasing to 3 to 5 metres around midday.
1st Swell
West to southwesterly 2 to 3 metres inshore, increasing to 4 to 6 metres offshore.
Weather
Mostly sunny. 70% chance of showers, with possible small hail at night.
Weather Situation
Warm northwesterly winds expected ahead of a cold front crossing the state this evening. The flow will tend colder southwesterly on Monday morning, with a high to establish over the Bight later Monday. This high is expected to move to the north of Tasmania on Tuesday morning and lie over the northern Tasman Sea during Wednesday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Bay of Islands Temperature Statistics View More

September Temperature

Cape Bruny (18km)

  • Lowest 16 September, 2026

    4.5 °C

  • Average September

    11.3 °C

  • Highest 14 September, 2026

    18.9 °C

Climate (2021–2026)

Cape Bruny (18km)

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  • Average Low 2021–2026

    9.6 °C

  • Average 2021–2026

    12.5 °C

  • Average High 2021–2026

    16.6 °C
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