CatchWindow fishing intelligence

Hilo, Hilo Bay, Kuhio Bay, HI Daily Water Report — September 6, 2026

Hilo Bay and Kuhio Bay set up as a keepers’ day for surfers, anglers, divers, and shoreline wildlife watchers, and a shrug for anyone who needs a filling sail. Surfing scores 8.2, fishing and diving 8, wildlife 8.5; sailing sits at 4.1, with boating and kayaking in the high fives. Those are suitability marks, not a safety declaration. A light south breeze—about 3 knots, gusting to 6 in the representative reading—does much of the quiet work. The day’s wind band is mostly 0.3–7.3 knots, but a 19-knot gust is forecast at 15:00, so treat midafternoon as the one window that can turn on you. Air is a muggy 24.3 C that feels like 29.4 under 100 percent cloud, 95 percent humidity, and UV at zero. A drizzle code and an all-day rain window sound worse than the 0.1 mm representative total; pressure holds near 1012 hPa and is stable. Atmospheric visibility is about 8 km. That is air, not water. The marine forecast is the tradeoff. Waves run 2.1–2.5 m, representative 2.14 m at 9.45 seconds, with swell near 2.06 m at 7.8 seconds from 68 degrees and only a thin wind sea. The calmest reading is still 2.08 m near 23:00. A 0.5 m/s current sets toward 45 degrees. That energy is why the surf score holds and why sailing, boating, and kayaking do not. Water is warm: SST 26.9 C, a marine reading of 27.2 C, about 0.7 C above average. Chlorophyll is a scant 0.06 mg/m3, oligotrophic blue water—a color and productivity note, not a fish report. Tide data are unavailable. Best windows cluster on the morning solunar major, 07:38–09:38, after the 06:07 sunrise, while the breeze is still light and before that midafternoon gust. A second major runs 19:38–21:38 after sunset at 18:33. Versus yesterday, fishing, diving, and wildlife are up; surfing is a hair off 8.4; boats and kayaks slipped as the sea stayed stout. Monday looks warmer, with peak wind near 11.5 knots, a 74 percent rain chance, and waves still around 2.1–2.2 m. Seas then ease through the week, toward 1.2–1.3 m by the 12th. Best bet: take the morning swell with the 07:38 solunar window, and leave the sails in the bag.