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.

March: Transitional Power

March marks the beginning of the transition toward spring, but the swell is still substantial – averaging 2.1m with a period of 11.2s. The swell direction table shows a strong west-northwest presence: W (22.8%) and WNW (11.3%) are the top contributors, with a notable 3.8% from NW. This is good news for St Ives, as WNW and NW are in the optimal quadrant. Wind conditions become slightly more favourable: the ideal wind percentage inches up to 17%. The wind direction frequencies show the SSW and SW sectors still dominant, but there is a decrease in the strongest gale-force winds compared to January. March often sees the first significant blocking highs, which can deliver several days of clean offshore winds from the south or southeast. When that coincides with a long-period NW swell, the beach becomes a playground of solid, rippable waves in the 1.5-2m range. It’s a month where you can score a winter-quality session without the worst of the winter gales – a sweet spot for the dedicated surfer.