St Marys Weather Forecast

    • 4
    • 13

    Showers increasing

    • 5
    • 12

    Showers easing

    • 7
    • 13

    Shower or two

    • 3
    • 12

    Shower or two

    • 3
    • 15

    Mostly sunny

    • 4
    • 15

    Mostly sunny

    • 4
    • 14

    Partly cloudy

Today 11 Jul East Coast

Mostly sunny. Areas of frost and patchy fog about higher ground in the morning. High chance of showers in the north, medium chance elsewhere. Winds north to northwesterly 15 to 20 km/h becoming light in the early morning then becoming northerly 15 to 25 km/h in the morning. Overnight temperatures falling to between zero and 5 with daytime temperatures reaching between 10 and 15.

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St Marys Temperature Statistics View More

July Temperature

St Helens Aerodrome (28km)

  • Lowest 5 July, 2026

    4.2 °C

  • Average July

    9.4 °C

  • Highest 1 July, 2026

    16.7 °C

Climate (2021–2026)

St Helens Aerodrome (28km)

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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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