Caswell Beach - surf spot statistics

Best Surf Season (October - March)

The North Atlantic flexes its muscles as autumn deepens into winter, delivering a consistent barrage of powerful, long-period swell to Caswell Beach. Average wave heights hover between 1.2m and 1.6m, with periods often stretching into the 10-second range, yielding punchy, rideable waves that wrap into the south-facing bay. While the dominant swell direction is from the WSW–W (not an optimal fetch), the moderate to strong storms spinning off Greenland and Iceland frequently send a healthy component of S to SW swell that aligns perfectly with the beach’s exposure. The trade-off? Onshore winds from the south and southwest blow a significant portion of the time, but when the Azores High ridges in or a cold front clears to the east, crisp northerly offshore winds (N, NNE, NO, NNW) clean up the lines. This is the window for the best surf of the year – think head-high to overhead bombs during active NAO-negative phases.

Fair Surf Season (April & September)

April and September represent the transitional shoulders, where the ocean’s energy is mellowing or building. The average swell drops to around 0.9m with periods around 8–9 seconds – enough for fun, groveling waves on a longboard or fish. Swell is still predominantly from the WSW–W, but the south component weakens, making it trickier to capture the ideal S–SW swell. However, wind patterns become more variable. Offshore northerlies still occur about 15% of the time in April and 12% in September, offering clean sessions if you pick your days. Expect smaller, more inconsistent surf, but when a late-season southwesterly gale brushes the UK or an early autumn low spins up, you can score a surprise chest-high swell with glassy conditions. It’s a gamble, but the rewards come with lighter crowds.

Low Surf Season (May - August)

Summer settles in and Caswell Beach enters its quietest phase. Average wave heights drop to a paltry 0.7–0.8m, and periods shorten to 7–8 seconds, producing weak, choppy surf that rarely breaks cleanly. The swell direction remains stubbornly from the WSW–W, which is far from ideal for the south-facing beach – the waves tend to be messy, soft, and quickly close out. Offshore wind opportunities shrink to just 11–12% of the time, and even those light northerlies can’t overcome the lack of swell energy. Persistent high pressure over the British Isles leads to long stretches of flat, calm conditions. If you’re desperate for a session, a summer southwesterly sea breeze might kick up some ankle-biters, but this is the time to explore other hobbies or wait for the first autumn storms to reignite the Atlantic machine.

March: Transitional Energy

March begins to ease but still packs a punch, averaging 1.2m swell at 10.0s. The dominant WSW (41.6%) and W (23.2%) swell persists, but the percentage of optimal south-southwest swell drops slightly. Wind ideals hold at 15%, with northerly directions (N, NNE, NE) still providing occasional clean sessions. As spring approaches, the jet stream starts to weaken, leading to more variable conditions. You can expect a mix of lingering winter power and the first signs of smaller, longer-period groundswell from distant storms. The average wave height in the 1–1.5m range is solid for the average surfer, and with periods averaging 10s, the waves are punchy and fun. Look for days when a strong northwest flow sets up – that’s your ticket to groomed lines at Caswell without the summer crowds.