CatchWindow fishing intelligence

Charleston, SC Daily Water Report — August 28, 2026

You’re looking at a textbook late-summer day on the Charleston coast—clean, calm, and very much worth your time. The verdict is clear: boating, diving, and kayaking are the standouts, all scoring in the high 8s, with fishing right behind at 7.5. The combination of a gentle southwest breeze, minimal wave action, and a falling tide through the afternoon makes this an ideal midweek window for getting on the water. The morning starts with a high tide just after sunrise, which is your cue for an early launch. Winds hover around 4 knots, barely enough to ripple the surface, and the representative wave height sits at a flat 0.46 meters—about a foot and a half. The calmest stretch arrives around 11 a.m., with waves dropping to 0.42 meters. That’s your sweet spot for kayaking or a leisurely paddle. The boating score of 8.8 matches the best we’ve seen in the past week, and with cloud cover at just 11%, you’ll have sun all day. For divers, the water temperature registers a balmy 29.7°C, well above the seasonal average by nearly a full degree. Visibility is decent at 13.4 kilometers—keep in mind that’s atmospheric visibility, not underwater clarity, but the warm, stable conditions favor good underwater sight lines. The high chlorophyll reading of 3.04 mg/m³ suggests a productive nearshore food web, though we can’t tie that directly to fish activity. A couple of cautions. The full moon overhead pulls strong tidal exchanges, so watch the current during the low tide slack around 2:43 p.m. That slack before the flood is your prime window for fishing, aligning with the solunar minor period from 12:21 to 2:21 p.m. The surf score is a middling 5.1, as those short-period 2.85-second swells from the south don’t have the energy for anything beyond small, mushy waves. Looking ahead, the forecast holds steady through the weekend. Friday brings similar light winds and slightly smaller waves, though a 40% rain chance may keep you guessing. By Sunday and into next week, temperatures climb toward 32°C as winds pick up to around 9 knots, offering more consistent sailing conditions but less glass for paddling. Bottom line: grab today’s flat water and full-moon tides—it’s the kind of calm August day that makes you remember why you own a boat.