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.

March: The Autumn Transition

March signals a shift toward more consistent surf. The average swell height jumps to 1.8m with a period of 10.4s – longer, more powerful lines that start to hold their shape. Dominant swell directions come from the S (15.2%), SSE (14.5%), and SE (13.6%), with a significant chunk from the ESE and E. This is the classic winter swell mix, and the strong component from the S means more energy wrapping into the bay. Wind conditions improve to 42% ideal, with the offshore quadrant (especially NW and NNW) becoming more frequent. However, the onshore SSW and S winds still blow 10-20% of the time, and they can wreck the surface if they pick up. March is a month where you can score solid, chest-to-head-high waves with clean offshore mornings, but you need to be wary of afternoon seabreezes from the east. The best bet is to surf early and often as the autumn gearing-up begins.