Crab Island - surf spot statistics

Best Surf Season (October - March)

The North Atlantic delivers its full fury during these months, with average swell heights pushing 2.0m to 2.5m and periods exceeding 11 seconds. Powerful low-pressure systems track across the Atlantic, generating consistent groundswell from the west and northwest that pounds Crab Island's west-facing beach. The dominant wind flow is from the south to west, which unfortunately is onshore for this spot. However, when a high-pressure ridge builds over the British Isles and the Azores High extends north, we see clean offshore winds from the east and southeast, especially during cold snaps. These windows, though rare (14-17% ideal wind), produce epic conditions with long-period, organized swell. The best bet is to watch for a negative NAO pattern that brings easterly winds.

Fair Surf Season (April - May & September)

Spring and early autumn offer a trade-off: the swell drops off to fun-sized 1.2-1.5m with periods around 10 seconds, but the frequency of favorable offshore winds increases. April sees the highest percentage of ideal wind at 21%, often from the east-northeast as pressure gradients relax. The waves become more manageable, making this a great time for longboarding or groveling on small days. September marks the transition back to bigger swell, but the wind patterns are still mixed, yielding a higher chance of clean conditions than mid-winter.

Low Surf Season (June - August)

Summer brings the smallest swell of the year, averaging around 1.1-1.2m with short periods (8.7-9.1s). The North Atlantic storm track shifts north, and the prevailing westerlies weaken. What swell does arrive is typically weak windswell from the west, quickly chopped up by onshore sea breezes. Ideal wind percentages drop to 13-16%, and even when the wind comes from the east, the waves lack power. Expect micro to small, grovelly conditions. Occasionally a distant hurricane or tropical storm can send a pulse of longer-period swell, but those events are rare. This is the season to explore other spots or take a break from surfing.

September: Return of the Swell

Average swell climbs to 1.5m, period 10.2s. Swell directions: W 37.0%, WNW 21.9%, WSW 17.1%. Wave heights expand: 1-2m range becomes more significant (combined 37%). Ideal wind back to 17% as the jet stream strengthens. The wind pattern shows more consistent wind from the SE-S (6-7.5%), offering cleaner conditions. This is a transition month with the potential for classic autumn surf: solid groundswell with offshore wind.