Mundaka seasonal overview
Best Surf Season (October - March)
This is when Mundaka earns its reputation as one of Europe's finest left-hand pointbreaks. As the North Atlantic storm track dives south and the NAO swings into a more active phase, long-period NW and WNW groundswells roll into the Bay of Biscay on a regular basis. Average wave heights climb from 5ft (1.5m) in October to over 6.5ft (2.0m) in the heart of winter, while periods hover in the powerful 11-13s range. The critical piece is wind: southern quadrant flow (S, SSW and SW) frequently blows offshore, grooming the famous rivermouth wall. Cold fronts and pressure gradients across northern Spain bring rain and instability, but they also fire up the swell machine that makes Mundaka so special.
Fair Surf Season (April, May & September)
The shoulder months offer a softer, often cleaner version of Mundaka. Average swell sizes drop to 3.5-4.5ft (1.1-1.4m) and periods ease into the 10-11s zone, so the wave loses some of its winter thickness but remains perfectly rippable. April can still pull good NW energy from spring lows, while May sees more sun and lighter winds. September is the strongest fair-season month as Atlantic activity begins to ramp back up, with ideal wind percentages rebounding to 24% and the autumn swell season just around the corner.
Low Surf Season (June - August)
Summer is the sleepy season in this corner of the Bay of Biscay. The Azores High bulges north, the storm track retreats, and average swell drops to around 3ft (0.9-1.0m) with periods in the 8.7-9.1s range. The swell direction is almost always from the northwest, but it is more local windswell than true groundswell. Thermal NE seabreezes and the lack of consistent S/SSW offshore winds keep the ideal wind percentage as low as 14-16%. Mundaka still turns on for the occasional late summer pulse, but those chasing quality should look to October.