CatchWindow fishing intelligence

Hilo, Hilo Bay, Kuhio Bay, HI Daily Water Report — August 28, 2026

A near-perfect day for diving and a solid morning for just about everything else. The verdict: get in the water early, before the afternoon breeze picks up and the full moon’s gravitational tug starts stirring the evening tide. Right now, Hilo Bay is glassy. Representative winds are a light 4 knots from the north-northwest, and the morning low tide at 08:57 will expose the inner flats. That low-water window, combined with a full moon overhead, often concentrates marine life in channels and deeper pockets, so divers and snorkelers will find excellent visibility—the offshore chlorophyll reading of 0.06 mg/m³ confirms that classic blue-water clarity. Water temperature is a balmy 27.5–27.9°C, and with negligible wind waves and a modest 1.4-meter swell from the east-northeast, gentle conditions prevail through the late morning. Surfers should note that the moderate but consistent 1.5-meter southeast swell is delivering rideable lines, especially on exposed breaks, and the offshore breeze should keep faces reasonably clean until midday. By 15:00, the high tide arrives at 0.82 meters, and that’s when the afternoon trade wind gust kicks up to 16 knots. That gust doesn’t wreck the whole afternoon—the calmest wave height at 1.4 meters occurs around 17:00—but the stronger puffs will test paddlers and small-boat skippers. Today’s boating score sits at 7.3, down slightly from yesterday’s 6.9, because the afternoon chop will build quickly. If you’re kayaking, aim for a launch before lunch and be off the water by three. The full moon rises at 18:30, so late-evening fishermen might find a decent second bite window during the minor period from 18:00 to 19:00, but the main solunar window is midday (11:30–13:30), right when the wind is most active. Compared to yesterday, diving conditions are identical at 8.3, still superb, while fishing slipped a tick to 6.4—the dropping pressure and stable winds are fine, but the full moon’s bright phase sometimes pushes feeding into the darker early-morning hours. Surfing holds steady at 7.5, with the long-period energy from the southeast keeping the wave count decent. Looking ahead, the forecast shows rising rain chances starting tomorrow—94% precipitation likelihood on Saturday—so today really is the golden window. Waves will build through the weekend, reaching 2.1 meters by Tuesday, and the winds will stay light but less consistent. Best bet: launch by eight, dive the low-tide flats, and you’ll remember this glassy August morning long after the clouds return.