Grindavík, Iceland, offers powerful and consistent surf conditions year-round, but the best months for surfers are from November to March, when ground swells dominate (73-91% occurrence) with mean swell sizes ranging from 2.7m to 4.0m. These winter months bring the biggest and cleanest waves, though strong offshore winds are rare (only 5-9% good wind conditions). The swell quality is excellent, with minimal wind swell interference and almost no flat days. February stands out as the peak month, with the largest average swell (4.0m) and the highest ground swell dominance (91%). However, surfers must tolerate harsh wind conditions, as bad onshore winds prevail over 90% of the time. Spring (April-May) and autumn (September-October) provide smaller but more manageable waves (2.0-2.2m), with slightly improved wind stats (10-13% good winds). Summer (June-August) is the least favorable due to smaller swells (1.2-1.5m) dominated by wind swell (77-83%) and still poor wind conditions (16-19% good winds). While Grindavík is surfable year-round, advanced surfers will find the biggest and cleanest waves in winter, despite the challenging winds, while intermediate surfers might prefer the shoulder seasons for slightly tamer conditions. The spot is rarely flat, but optimal sessions require patience for the right wind-swell alignment.