Kealia Beach experiences consistent swell year-round, with primarily ground swell dominating in winter and more wind swell in summer. The best months for surfers are from November to February, when ground swell makes up 51-70% of the waves, mean swell sizes range from 2.1m to 2.2m, and wind conditions are relatively less unfavorable (though still mostly onshore). December stands out with the largest average swell size (2.2m) and decent ground swell influence (60%), despite only 15% of days having good winds. January follows closely with 70% ground swell and 2.1m waves, though wind conditions are poor 77% of the time. The summer months (May-September) see smaller swells (1.6-1.7m), dominated by wind swell (59-72%), and nearly constant bad winds (88-94%). While surfable waves are always present, the ideal balance of size, ground swell purity, and marginally better wind odds occurs in winter, particularly December-January, despite the prevalent onshore winds requiring patience for cleaner sessions. Spring and fall offer transitional conditions, with October-November providing a slight bump in ground swell and size compared to summer.