Rhossili Bay - surf spot statistics

Best Surf Season (October - March)

The North Atlantic awakens in October, and by November the Gower Peninsula is firmly in the firing line. With average wave heights pushing above 1.2m and periods climbing into the 9-10 second range, these months deliver the most consistent swell of the year. The dominant westerly and south-westerly swell trains – perfectly aligned with Rhossili’s SSW exposure – produce powerful, long-period surf that can range from punchy 1-1.5m fun to pumping 2.5m+ XL beasts when deep Atlantic lows stall west of Ireland. The catch? Onshore winds from the same direction often accompany these storms, making clean conditions a gamble. However, when a high-pressure ridge sets up over Scandinavia, the offshore N-NE flow creates glassy, lined-up waves that make the long walk to the water well worth it. This is the prime window for size and power, especially December through February.

Fair Surf Season (April, September)

The transitional months of April and September offer a more mixed bag. Average swell heights drop to 0.9m and periods shorten to the 8-9 second range, but there’s still enough energy from the SW-W swell window to produce rideable waves for the majority of days. The ideal wind frequency holds at a moderate 7-11%, and with weaker wind speeds overall, windows of cleaner conditions can align with small to moderate swell. April sees the last of the winter swell while September hints at the coming autumn ramp-up. These are great months for loggers, mid-lengths, and anyone who prefers a more manageable, less crowded lineup – just keep an eye on those pesky onshore troughs.

Low Surf Season (May - August)

Summer brings the Gower’s infamous ‘flat spell’. From May through August, average swell heights languish around 0.7-0.8m with periods rarely exceeding 8 seconds. The dominant swell direction remains WSW-W, but the energy is minimal and often overpowered by thermal-driven onshore breezes. Ideal offshore wind frequency drops to a paltry 6-8%, meaning most days are plagued by bumpy, messy conditions. While the occasional rogue south-westerly groundswell can sneak in, the lack of consistent North Atlantic storm activity and the prevalence of high pressure over the UK make this the quietest period. For the dedicated surfer, a foam board or a summer trip to the South Atlantic is a better bet. Still, Rhossili’s beauty and the occasional small grovel session on a glassy dawn can provide a few moments of joy.

October: The Ramp Up

October marks the real start of the best season. Average swell height jumps to 1.2m and the period reaches 8.6s. The SW (12.3%) and WSW (35.3%) quadrants dominate, now producing more waves in the 1-1.5m and 1.5-2m ranges. The influence of deep Atlantic lows becomes more frequent, and the average period increases as groundswell components strengthen. The ideal wind frequency is still low at 7%, but the pattern of onshore winds is now more episodic – between frontal systems, high pressure can deliver clean offshore conditions for a day or two. The bigger wave days might be wind-affected, but the quality of the swell is undeniable. Keep a close eye on the synoptic charts; the magic sessions are coming.