St Ives - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during these months, delivering the largest and most powerful swell to St Ives. Average wave heights climb above 2m and periods consistently exceed 10s, with many pulses in the 12-14s range – true groundswell generated by deep extratropical storms tracking across the ocean. The beach faces NNW, so the optimal swell from N, WNW, NW and NNW hits the coast with authority, especially when the fetch aligns. However, this is also the stormiest time of year: prevailing winds from the SW through NW dominate, often blowing directly onshore and ruining the quality. The ideal offshore sector (S, SSW, SW, WSW) is only present about 16-20% of the time. Still, when a strong high pressure ridges into the Bay of Biscay or southern England, it pulls a crisp offshore breeze over St Ives Bay, turning the raw Atlantic energy into clean, hollow, rippable waves – the kind that make this season legendary. The NAO index plays a key role: a negative phase tends to steer low-pressure systems further south, giving the region more settled windows.

Fair Surf Season (April - May & September)

Spring and early autumn bring a noticeable transition. Swell heights drop from the winter peak but remain fun-sized – averaging 1.4 to 1.6m in April/May, and around 1.4m again in September after a summer lull. Periods settle into the 9-10s range, offering punchy, rideable waves that hold their shape better on favourable tides. The percentage of ideal offshore wind improves slightly (up to 21-22% in April and September) as high pressure systems become more common. Swell direction shifts slightly more towards the west, but there are still enough N to NW pulses to light up the sandbars. These months are a gamble: you can score a clean, glassy 3-4ft day with offshore winds, or you can face small, weak, onshore slop. It’s a transition period – less consistent than winter, but with better odds of enjoyable sessions without the gale-force winds.

Low Surf Season (June - August)

Summer is the quietest time for St Ives. The North Atlantic storm track shifts north, leaving the region under a ridge of high pressure or weak low-pressure systems. Average wave heights hover around 1.2m and periods drop to 8-8.5s – mostly short-period windswell generated by local sea breezes or distant northern lows. The dominant swell direction remains west, which is not ideal for this NNW exposure, resulting in weak, closeout conditions even when waves do arrive. The percentage of offshore wind drops back to 17-18%, but even when the breeze is from the south, the lack of swell energy means small, grovelly waves at best. Occasional mid-period pulses from decaying tropical systems can offer a brief upgrade, but they are rare. If you’re desperate for a surf, dawn patrols with a westerly swell and a light southerly wind might produce some waist-high peaks. Generally, June through August is a time for other water activities – the surf is best left to the sandbar reflections and the hope of an early autumn cold front.

April: Spring Stoke

April sees a noticeable drop in average swell height to 1.6m and period to 10.1s, but the quality improves due to better wind patterns. The ideal wind frequency hits 21% – the second highest of the year. Swell direction is still dominated by W (23.4%) and WSW (17.4%), but there is a healthy dose of WNW (12.1%) and NW (4.9%). The shorter period (10s) means waves are more punchy and less powerful than winter, but they hold shape well on the sandbanks. Spring high pressure systems often sit over the UK, pushing the wind into the southerly or southeasterly quadrants – perfect offshore for St Ives. Days with a light SSE wind and a 2m W swell can produce fun, clean waves in the chest- to head-high range. April is a month of opportunity: the crowds are still thin, and the conditions, while smaller, are often more user-friendly than the winter chaos. It’s a great time for intermediate surfers to log quality sessions.