Wainui Beach - surf spot statistics

Best Surf Season (May - August)

Winter brings the most consistent and powerful surf to Wainui Beach. The average swell height peaks at 2.1m in June and July, with periods averaging 10.8-11.0s, translating to punchy, long-period groundswells that wrap beautifully into the bay. The climatological strengthening of the Southern Ocean storm track fires up the Tasman Sea and South Pacific, sending frequent, energetic swells from the S through ESE quadrants – exactly what this east-southeast-facing beach craves. Offshore winds from the W, WNW, and NW dominate during these months, with ideal wind percentages hitting 54% in May and June, and staying high through August. This combination delivers clean, hollow peaks and long walls that are a magnet for intermediate and advanced surfers alike.

Fair Surf Season (March - April & September - October)

The shoulder months offer a mixed bag but plenty of quality sessions. March and April see average swell heights of 1.8m and periods around 10.4-10.7s – still solid but slightly less consistent than winter. The wind becomes more variable, with ideal percentages dropping to 42-49%. Lingering winter swells from the S and SSE often mix with more easterly swell, and the westerly wind regime is still reliable, especially in the mornings. September and October see average heights dip to 1.6-1.7m as the storm track weakens, but the offshore wind window remains decent (47-51%), and you can still score clean, fun waves during the cold fronts that sweep across the South Island. The key is timing: early summer weather patterns start creeping in, bringing lighter winds but also more onshore easterlies.

Low Surf Season (November - February)

Summer is the least reliable time for quality surf at Wainui Beach. Average swell heights drop to 1.5-1.6m with periods around 9.6-9.9s, resulting in more inconsistent, shorter-period swell that often feels small and sluggish. The tropical Pacific and Tasman Sea become quieter, and the dominant swell directions shift northward – with a notable increase in ENE and NE swell that doesn't match the beach's optimal exposure. Offshore wind percentages hit their lowest, falling to 38-41% in January and February, as the prevailing flow becomes more onshore from the east and northeast. When the rare southerly swell coincides with a southerly buster or a west wind change, it can fire up, but those moments are few and far between. Expect largely small, wind-affected conditions – better left for a day at the beach with the family than a serious surf session.

April: Solid Groundswells and Westerlies

April is a prime month for Wainui Beach. Average swell height holds at 1.8m, but the period lengthens to 10.7s, indicating more powerful, long-period groundswells. The swell direction is heavily weighted toward the S (18.2%) and SSE (17.2%), with SE (12.2%) also prominent. These southerly swells are generated by intense polar lows in the Southern Ocean and wrap perfectly into the east-southeast-facing beach. Offshore wind conditions hit 49% ideal – the highest since the previous winter – with the W, WNW, NW, and NNW quadrants combining for over 30% of the total wind distribution. The strongest offshore winds (10-20kph) come from the NW and NNW, providing clean, groomed faces. April mornings are glassy, with the pattern of night-time westerlies giving way to light easterly seabreezes later. This is the sweet spot: consistent 1.5-2.5m waves, good period, and reliable offshore flow. Don't sleep on April.