Tywyn - surf spot statistics

Best Surf Season (October - March)

The North Atlantic delivers its fiercest storms during these months, pumping consistent, powerful SW to WNW swell into Tywyn's west-south-west facing beach. Average wave heights hover around 1.0-1.1m with periods frequently in the 8-9 second range, offering punchy, rideable surf. However, the dominant wind direction is also from the SW to W, blowing directly onshore a majority of the time. The key to unlocking the best waves lies in high-pressure systems over Scandinavia or a negative NAO pattern, which can set up crisp offshore winds from the E to NE quadrant. When that rare alignment occurs, you get clean, long-period swell wrapping in – that's when Tywyn truly fires. The ideal wind percentage maxes out at around 12%, so patience and a keen eye on the forecast are essential.

Fair Surf Season (April - May & September)

As the North Atlantic storm track begins to shift northward in spring, swell heights drop to an average of 0.6-0.7m with periods shortening to the 6-8 second range. The surf becomes smaller and more inconsistent, but the reduced swell often coincides with lighter winds. April and May see an increase in E to NE winds (offshore) but also a higher frequency of light onshores. September marks the transition back toward winter, with a slight uptick in swell size and period (0.7m, 6.8s) and a similar ideal wind window of around 6%. These months offer occasional fun, groveling sessions when a late-season or early-season low sends a clean swell and the wind plays ball. Expect mostly small to fun-sized waves with some punchy sets on the better days.

Low Surf Season (June - August)

Summer is the most challenging time for surf at Tywyn. The North Atlantic storm track retreats far north, and the prevailing wind shifts to a persistent onshore flow from the SW and W. Average swell heights bottom out at just 0.5m with periods as low as 6.0 seconds, resulting in mostly choppy, weak, and messy conditions. The ideal wind percentage plummets to a mere 2-3%, meaning offshore winds are exceptionally rare. While the occasional distant storm can send a small, long-period pulse, the combination of small swell and mostly onshore wind makes for a long stretch of poor surf. This is a good time to focus on other activities or travel to more exposed spots with summer trades, but when the stars align and a rare easterly breeze meets a modest SW groundswell, you can still find a few small, clean waves at dawn.

December: The Winter Grind

December brings the full weight of winter to Tywyn. The average swell height is 1.1m and period 8.4s, with a significant amount of energy arriving in the 1.5-2.5m and even over 2.5m range from SW and WSW. Over 58% of the total swell comes from these two directions, and nearly 30% of that is over 1.5m. However, the wind is a serious obstacle: onshore SW to W winds blow over 35% of the time, often at 20-40 kph, making the surf messy and difficult. Offshore winds from the E to NE occur about 18% of the time, and ideal wind is at 12%. The consistent storm track means the window for pristine conditions is small, but when it happens—often after a cold front when high pressure slides in from the continent—the waves can be firing. December is for the hardcore: checking forecasts daily, battling winter gear, and scoring those all-too-rare days when the swell and wind align perfectly.