Dianas Basin Weather Forecast

    • 7
    • 13

    Showers developing. Windy

    • 5
    • 14

    Sunny

    • 3
    • 15

    Mostly sunny

    • 8
    • 17

    Showers increasing

    • 7
    • 14

    Shower or two

    • 3
    • 14

    Mostly sunny

    • 3
    • 15

    Shower or two

Today 19 Jul St Helens

Partly cloudy. High chance of showers, most likely during this afternoon and evening. Damaging winds possible, easing in the evening. Winds northwesterly 35 to 50 km/h.

Upper East Coastal Waters

St Helens Point to Wineglass Bay
Wind
North to northwesterly20 to 30 knots, reaching 25 to 35 knots in the late morning and afternoon. Winds then tending northwesterly 20 to 30 knots in the evening.
Seas
2 to 2.5 metres, increasing to 2.5 to 4 metres during the morning.
1st Swell
Southerly around 1 metre.
Weather
Partly cloudy. 60% chance of showers.
Weather Situation
A northwesterly airstream persists over Tasmania ahead of a strong cold front, expected to cross the state from the west on Saturday. A high pressure system over mainland Australia extends a weak ridge over the Tasmania on Sunday, before moving into the Tasman Sea during Monday.
Graph Plots Open in Graphs

  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Dianas Basin Temperature Statistics View More

July Temperature

St Helens Aerodrome (5km)

  • Lowest 12 July, 2025

    0 °C

  • Average July

    8.9 °C

  • Highest 7 July, 2025

    16.6 °C

Climate (2020–Present)

St Helens Aerodrome (5km)

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  • Average Low 2020–2025

    9.4 °C

  • Average 2020–2025

    13.3 °C

  • Average High 2020–2025

    18.2 °C
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