It is well known that Melbourne can have “4 seasons in one day” but these small changes in weather generally do not effect diving. If it’s forecast rain, it doesn’t matter you’re already planning to get wet! When it’s raining you will often find that the wind dies down and surface conditions improve.
To gain the best idea for the weather forecast we use a variety of resources which area available online. These include:
This gives a local inside the bay forecast from Port Phillip Heads up to the city. It’s a good gauge for wind speed inside the bay.
This is the Central Coastal Forecast for outside Port Phillip Heads. This ranges from Cape Otway across to Wilsons Prom, then Port Phillip Heads down to King Island.
Meteye is a fantastic new interactive map and can be used to zoom in on your location. You can select wind and swell on the left hand side and then zoom into Port Phillip Heads. You can also look 4-7 days in advance.
Seabreeze is a windsurfing website which gives the wind, swell and temperature for Melbourne. Its swell prediction is usually more than the actual and is only good to look a maximum 4 days ahead.
This site gives you a look at the current conditions of the heads. Select Point Nepean for swell or Point Lonsdale for wind.
Its always important to note the period of the swell and direction of the wind as a 40k/hr Northerly wind is great for diving outside the heads but maybe too lumpy for Portsea Hole.
To transit Port Phillip Heads the significant swell must be less than 2 metres and wind less than 20kts from the Southerly half. All these sites are usually updated around 5am and 5pm each day. If we think the weather will cancel your trip we will either call or email following the update the day before so it is essential that you have given us all your details.
A large high pressure system over the Tasman Sea will remain slow moving during today. A low pressure trough over South Australia is expected to reach far western Bass Strait early on Thursday, crossing to eastern waters by Thursday night then moving over the Tasman Sea. Another high pressure system will then become established in the Bight on Friday and extend a ridge across Victoria, with the same pattern persisting over the weekend.
North to northeasterly 10 to 15 knots tending northerly 15 to 20 knots in the morning.
Northerly 15 to 25 knots tending northwesterly 10 to 15 knots in the early afternoon then shifting southwesterly 15 to 20 knots in the late afternoon before easing to 10 to 15 knots at night.
West to southwesterly 15 to 20 knots tending south to southwesterly during the morning.
Southerly 10 to 15 knots turning southwesterly 15 to 20 knots during the day.
Last Updated: 18/10/2017 05:10am