Kohala Lighthouse - surf spot statistics

Best Surf Season (November - February)

The heart of winter brings the most reliable combination of North Pacific swell and occasional offshore wind from the south. During these months, the jet stream strengthens, sending a parade of extratropical storms across the North Pacific. These systems generate long-period NW to N swells that directly light up Kohala Lighthouse. While the trade winds still dominate, the frequency of southerly wind events increases, especially when high pressure sets up to the north. This is the prime window for pumping waves in the 1.5-2.5m range with periods exceeding 12s. Expect the best conditions when a cold front clears the islands, leaving behind a light SSE or SW breeze and a powerful NW swell.

Fair Surf Season (March - April & September - October)

The shoulder months offer a mixed bag. Spring sees the North Pacific storm track shifting north, reducing the frequency of N swells. However, occasional long-period NW groundswells can still sneak through, especially in early March. The trade winds are still strong, making clean conditions rare. Autumn brings a gradual ramp-up in swell activity as the Aleutian low reawakens. September can see the tail end of the south swell season, but with the north-facing exposure, these swells are largely blocked. October shows increasing N and NNW swell contributions, and with the trade winds weakening, the chance for a glassy morning increases. Surfable waves are present, but consistency and quality are lower than in the peak season.

Low Surf Season (May - August)

Summer is the most challenging time for surf at Kohala Lighthouse. The North Pacific swell machine shuts down almost completely, leaving the spot exposed to only local windswell and E to ENE trade wind swell. These swells approach from an unfavorable angle, wrapping only slightly into the north-facing nook. The persistent trade winds blow from the east, creating cross-onshore conditions that chop up the already weak waves. Wave heights average 1.6m but with short periods (8-9s), making for bumpy, low-quality surf. The wind is ideal (southerly) less than 1% of the time. Unless you're a log enthusiast looking for small, groveling waves, this is a good time to explore other spots on the island.

April: Fading Winter, Rising Trades

April represents the tail end of winter swell potential, with average height still at 1.8m but period dropping to 10.2s. The N contribution almost disappears (0.3%), and the dominant swell is from ENE and E, accounting for 76.9% combined. This trade wind swell is mostly unmanageable for Kohala Lighthouse, as it approaches from an east-northeast direction, creating weak, short-period waves. Wind ideal percentage plummets to 4%, and the trades are relentless (E and ENE over 85%). Surfable days are rare and typically require a southerly wind event that can clean up the small, windswell-affected surf. It's a month of patience; the occasional north groundswell can still sneak in from a distant storm, but the odds are low.