Fishing & Diving Weather — Port Phillip Bay, Westernport & Bass Strait

What makes a good fishing day in Port Phillip Bay?

Most of the day-to-day variation in your catch comes down to four things: wind, tide, barometric pressure and water temperature. Get those four lined up and even an average angler does well. Get them wrong and the bay can feel empty.

Wind under 15 knots is the sweet spot for Port Phillip Bay. Anything over 20 knots and the chop kills bait presentation, GPS holds get sloppy and your day stops being fun. North-easterlies push warm surface water across the bay and tend to fish well in the mornings; south-westerlies bring cooler water and clean up the colour after a few days of muck.

Tide movement matters more than tide height. Fish feed on moving water. The two hours either side of a tide change is the prime window almost everywhere in the bay — baitfish get pushed around, predators get switched on. Slack water (the 30 minutes at the top or bottom of the tide) is often the quietest period, even when everything else looks perfect.

Barometric pressure is the underrated factor. A rising barometer (especially after a low) tends to fire fish up. A falling barometer can mean a frantic feed before a front, then dead water for 24-48 hours after. We feed pressure into the Bite Window above so you can see it at a glance.

Water temperature drives what's biting. Snapper love 16-20°C. King George whiting prefer 14-18°C. Flathead are more forgiving but bite hardest when the water hits 16°C in spring. The sea-temp tile updates every 30 minutes from the marine wave model.

Best tide for snapper, whiting and flathead

The right tide depends on the species and the spot, but a few patterns hold across the bay.

• Snapper bite hardest on the run-out tide in the channels (West Channel, South Channel, the Rip) and on the run-in over inshore reefs. Two hours either side of high tide tends to outperform the lows in the deeper water.
• King George whiting love the last two hours of the run-in and the first hour of the run-out. They feed on weed beds and sand patches that get freshly flooded.
• Flathead are tide-tolerant but absolutely turn on during the change. Drift the edges of channels and gutters as the water starts moving and you'll usually find them.
• Squid peak around dawn and dusk regardless of tide, but a strong run-in over weed beds at first light is hard to beat.

The tide curve in the conditions grid above shows you the next 12 hours. Look for the steepest part of the curve — that's when the water is moving fastest and the fish are most likely to feed.

Tide times are predicted from the harmonic model. Not station-corrected. Not for navigation. Always check the Bureau of Meteorology before heading offshore.

What causes poor dive visibility in Bass Strait?

Dive viz on the Victorian coast is one of the most variable conditions in Australian diving. A site that pushes 20m on a Saturday can drop to 2m by Monday after a single big southerly. Eight factors drive it:

1. Swell direction vs site exposure. A south-westerly 3m swell into a south-facing site like Cape Schanck or Phillip Island wrecks viz instantly. The same swell behind Wilsons Prom or up in the bay barely registers.
2. Swell period. Long-period groundswell (12s+) is calm energy and lets sediment settle. Short-period wind chop (under 7s) stirs the bottom up and kills viz fast.
3. Wind direction. Onshore winds at the dive site push surface murk into the water column. Offshore winds blow it out to sea and clean things up.
4. Surface ocean current. Strong currents move plankton blooms in or out. We pull this from the marine wave model.
5. Storm surge / sea level anomaly. When the sea level is sitting unusually high, you've got more water column moving over the reef — usually means more sediment in suspension.
6. Live chlorophyll-a. A bloom turns the water green and crashes viz even if everything else is perfect. We pull live satellite chl-a from IMOS, blended with the 30-day median for each site.
7. River discharge plumes. The Yarra, Snowy, Glenelg and Mitchell can dump muddy fresh water for days after rain. Sites near river mouths suffer for a week post-flood.
8. Tide movement & storm hangover. Slack tide gives the cleanest viz. And even after a storm passes, it usually takes 24-48 hours for the suspended sediment to drop out.

The Dive Visibility module above scores all eight factors live for 10 Bass Strait sites — from the Heads through HMAS Canberra, Wilsons Prom, Cape Otway and Portland. Pick a dive site from the location dropdown to see today's score plus a 7-day forecast.

Snapper season 2025/2026 — when to fish Port Phillip Bay

The Port Phillip Bay snapper run typically peaks from mid-October through to mid-January, with a second strong window in March-April as the water cools. As of April 2026, we're inside the autumn bite — fish are still scattered across the bay but the bigger reds are starting to school up around the deeper channels and reef edges.

The most productive snapper spots include the West Channel, South Channel, Mud Islands area, the Heads (run-in tide only — the Rip is no place to mess around), and the inshore reefs off Mornington, Frankston and Carrum. Use the live wind hero above to check whether your favourite spot is fishable this morning.

For more on technique and rigs, see our guide on Snapper Fishing Port Phillip Bay.

Where to fish when it's windy

You don't have to write off a day just because the wind hero says 25 knots. Port Phillip Bay is big and L-shaped — there's almost always a sheltered shore. The trick is reading the wind direction and finding the lee.

• Strong north-easterly: shelter behind Werribee, St Leonards, Queenscliff or the inside of the Bellarine.
• Strong south-westerly: head for Carrum, Frankston, Mornington — the eastern shore.
• Strong westerly: Mt Martha to Sorrento has good lee water close to the launch ramps.
• Strong southerly: tough day. Stay up the top of the bay near Williamstown, Altona or the Yarra mouth.

Westernport gives you even more options thanks to the islands. North Arm shelters from southerlies; East Arm shelters from westerlies. Use the spot picker above and check each one's wind tile before you decide.