Zavial seasonal overview
Best Surf Season (October - March)
Zavial's best months are the autumn and winter ones, when the North Atlantic low-pressure engine re-ignites. The storm track crosses the eastern Atlantic, driving average swell heights into the 6-8ft (1.8-2.4m) range and pushing wave periods up to 11-13 seconds. The NAO is the master switch: when it turns negative, depressions ride farther south and deliver the S/SW angled groundswell that Zavial's SSW-facing beach craves. Combined with post-frontal offshore N/NNE/NE/NNW winds, this window produces the clean, lined-up conditions the spot is made for. The direct S/SW component is never a huge slice of the wave rose in absolute terms, but October-March - especially November and December - holds the highest share, and that is when Zavial really fires.
Fair Surf Season (April - May & September)
These are shoulder months, caught between the winter storm track and the summer Azores High. Swell sizes settle to 4-6ft (1.2-1.9m), periods hover around 9-11 seconds, and the energy becomes more windswell-driven from the NW/NNW quadrant. There are still clean and glassy windows, with September especially seeing ideal wind percentages push into the low 40s, and the first or last hints of S/SW groundswell can appear. Surfing is fun and often rippable, but consistency lacks the raw power of winter and the direct SSW-SW energy is less reliable.
Low Surf Season (June - August)
Summer locks in a stable Azores High pattern over the eastern Atlantic. The storm track goes quiet and the wave mix at Zavial becomes mostly short-period NW/NNW windswell, while direct S/SSW/SW swell drops to nearly zero. Periods fall to 8-9 seconds and sizes average only 4-5ft (1.2-1.5m), often soft, bumpy or wind-affected. July is the absolute low point. Positive NAO summers push even more energy north, leaving Zavial small and windswell-backed. A few patient mornings with the longboard can still be magic, but the true surf season is on hold.