Dee Why Point - surf spot statistics

Best Surf Season (May - August)

This is when the winter engine of the Tasman Sea really kicks into gear. High-latitude low-pressure systems deepen off the southeast coast of Australia, firing up long-period S to SSE swells that wrap beautifully into Dee Why Point. Simultaneously, the offshore wind window widens dramatically: with more than 44% of the time seeing clean W to SW flow (ideal for this east-facing setup), the point often delivers groomed, powerful waves. Periods average 9.5-9.7 seconds, pushing the swell into the 'punchy to powerful' range, and heights sit consistently in the 1.5-2.5m range – solid, rippable, and at times truly pumping. Late autumn and winter are the prime, no doubt about it.

Fair Surf Season (March, April, September, October)

As the transition seasons set in, the climate patterns become more fickle. The subtropical ridge starts shifting, and the frequency of strong southerly swells begins to ebb or ramp up. March and April still see a decent share of S/SE swell, and wind quality improves as the months progress – April hits 33% ideal wind – so you can still score clean, fun waves on the right days. September and October bring the first southern spring storms, but also more interference from weakening summer patterns. Swell heights hold up around 1.6-1.7m, but the periods dip slightly compared to winter. When a south swell lines up with a land-based westerly, the point still turns on, but you will have to pick your windows carefully.

Low Surf Season (November - February)

Summer snuffs out the long-period groundswells. The south swell corridor goes quiet as the storm tracks retreat toward Antarctica, and the dominant swell shifts to short-period, choppy E and NE pulses generated by local sea breezes and tropical easterly trades. Periods average only 8.3-8.8 seconds, resulting in weak, crumbly waves unless a cyclone wanders south. Even worse, the onshore winds rule – NE to E breezes spoil the surface more than 85% of the time, making conditions sloppy and bumpy. Ideal offshore flow from the west drops to just 12-15%. A few fleeting windows open when a ridge builds offshore, but for the most part, this is the time to schedule gear repairs and wait for autumn.

December: Summer Return

The cycle resets to summer patterns. Average swell drops to 1.5m – the smallest of the year – and the period stays at 8.3 seconds, so weakness prevails. Swell direction is heavily weighted toward SSE, SE, and ENE, with no west component at all. The ideal wind percentage plummets to 15%, with the wind mostly blowing from NNE, NE, and ENE (over 36% of the time at 10-30+kph). This onshore flow destroys the wave quality. The rare offshore days occur only when a southerly bust pushes the wind into the SW/W quadrant, usually for a few hours in the afternoon. Those windows are precious but few. If you find yourself at Dee Why Point in December, you are either a morning warrior chasing small, clean waves before the seabreeze, or gambling on a tropical cyclone drifting south to deliver a rare, clean swell. Most of the time, it is a struggle.