CatchWindow fishing intelligence

San Francisco, CA Daily Water Report — August 27, 2026

A decisive verdict for Thursday, August 27: wildlife watchers rule the day, while most other activities split moderate to favorable. The big story is a full-on chlorophyll bloom pumping the score to 8.4—just don’t confuse that green signature with underwater visibility. The late morning solunar minor period, a long-fetch west swell, and manageable wind make the late-morning window the sweet spot for anyone who can stay flexible. Southwesterly winds blow at a representative 9 knots, gusting to 13, which is a noticeable uptick from yesterday’s docile 4.3-knot breeze. That breeze rowdiness pinches paddling and boating scores into the mid-5 to mid-6 range—doable in a protected cove or harbor, but the open coast will feel active. The swell runs 0.92 meters at a short 4.95-second interval from the northwest, which works well for surfers: the 7.4 score matches yesterday's and tops the 6.6 from Tuesday, though the short period means softer, less organized waves than a groundswell would bring. The calmest wave height of 0.98 meters arrives near 8 a.m., making the early predawn a reasonable launch time for a quick session before the sea breeze strengthens. Fishing sits at a lukewarm 6, down from yesterday’s 7.9. The stable barometric pressure at 1015 hPa offers no imminent front, and the waxing gibbous moon at 98% illumination produces bright overnight skies that can suppress heavier bites. The solunar major period from 11:33 to 13:33 is the best bet, but don’t expect a repeat of Wednesday’s feeding window. Divers earn a 6.8, about one point beneath the recent string of 7s—wind and waves combine to stir the shallow zone, and that chlorophyll bloom likely drops subsurface clarity, so pick a spot with structure to work the drift. Compared to the past week, today’s composite picture is most similar to August 22: similar wind energy, a boating score within a hair, and a wildlife score nearly a point higher. The difference is daytime warmth—the 15.3°C feels like 14.1°C is comfortably cool, while the forecast high of 23.2°C inland could cook the afternoon. Looking toward the weekend, Friday holds near-identical wave heights and a similar wind profile, keeping scores in the same neighborhood. Saturday and Sunday bump up to 1.4-meter seas and a slight uptick in wind, which will push boating and kayaking lower. The real prize lies at the start of September, when waves drop below a meter and winds ease into the teens—that’s the window to circle for a flat-water outing. For now, your best bet is to get out for the late-morning wildlife cruise with a steady binocular hand and an eye on the horizon.