WHEN.SURF FORECAST Oahu South Shore

Small long-period south lines keep the dawn patrol rideable, mostly knee to thigh at average spots with occasional waist-high sets at the better reefs. Light to moderate trades stay favorable and fairly clean. The late-morning low tide should help the smaller surf stand up a little better.

Still on the small side through midday, but the low tide near 11am should make the surf a bit more playful. Expect mostly knee to thigh waves at average reefs and occasional waist-high sets on the better pulses. Trades remain offshore enough for clean faces, with only a little easterly lump outside.

Not much size change for the afternoon, but the rising tide trims some push at smaller reefs. Look for mostly knee to thigh surf with occasional waist-high sets. Trades freshen a notch and the easterly lump gets more noticeable, so conditions stay rideable but less polished toward sunset.

A more solid south swell should start showing through Monday morning, especially from mid-morning on. Early surf looks thigh to waist at average spots, with better sets pushing stomach high and occasionally chesty late in the window. Easterly trades add texture, but the late-morning low tide should help the build show.

The new south swell should be more established by the afternoon, with waist to stomach waves at average spots and occasional chest to shoulder sets at the better reefs, a touch bigger late. Expect long waits between the better pulses. Easterly winds keep some texture on it, and the rising tide softens smaller sections near dusk.