Merries Reef Weather Forecast

    • 17
    • 25

    Partly cloudy

    • 17
    • 29

    Becoming windy. Partly cloudy

    • 15
    • 17

    Showers

    • 14
    • 18

    Cloudy

    • 14
    • 19

    Partly cloudy

    • 13
    • 23

    Sunny

    • 15
    • 26

    Sunny

Today 25 Sep Sydney

Partly cloudy. The chance of a thunderstorm in the afternoon and evening, possibly severe with damaging winds, large hail and heavy rain which may lead to flash flooding in the west. Winds northeasterly 15 to 25 km/h becoming light in the evening.

Sydney Coastal Waters

Broken Bay to Port Hacking
Wind
Northeasterly 15 to 20 knots, reaching up to 25 knots offshore during the afternoon and evening. Winds turning northerly in the evening.
Seas
1 to 1.5 metres, increasing to 1.5 to 2 metres offshore.
1st Swell
Southerly below 1 metre.
Weather
Mostly clear. The chance of a thunderstorm inshore early this evening.
Weather Situation
A high pressure system over the Tasman Sea directs a northeasterly flow through the coastal waters. A cold front and trough will pass through the Tasman Sea during the weekend, bringing a southerly change that will track northward along the NSW coast during Saturday and Sunday. Another high crossing Tasmania early next week will then extend a new ridge into the coastal waters.
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  • Temperature Forecast Bureau of Meteorology

  • Temperature Real-Time

Merries Reef Temperature Statistics View More

September Temperature

Sydney Airport (11km)

  • Lowest 18 September, 2026

    9.1 °C

  • Average September

    17.9 °C

  • Highest 20 September, 2026

    32.7 °C

Climate (2021–2026)

Sydney Airport (11km)

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  • Average Low 2021–2026

    15 °C

  • Average 2021–2026

    18.8 °C

  • Average High 2021–2026

    23.5 °C
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