CatchWindow fishing intelligence

Charleston, SC Daily Water Report — August 27, 2026

Today’s water is a study in tradeoffs: diving is excellent, but you’ll need to pick your window carefully for most other activities. The south wind builds through the day, so early is your friend. The morning hours deliver the best overall conditions. Winds start light, around 1 knot near dawn, and the waves hold at a manageable 0.5 meters through 11:00. That’s the calmest stretch of the day, and it’s when diving scores an 8.2—the top mark today. Water temperature sits at a balmy 30°C, and though I can’t speak to underwater visibility directly from atmospheric data, the combination of light wind and minimal wave action suggests the surface will be cooperative. If you’re a diver, plan your entry before the wind kicks up. Fishing rates a solid 7.3, buoyed by the solunar major period from 11:38 to 13:38 and stable pressure at 1016 hPa. The chlorophyll reading is elevated at 3.04 mg/m³, which often correlates with productive water, though I won’t infer specific baitfish or gamefish behavior from that figure alone. The waxing gibbous moon, 98% illuminated, may also encourage some early evening activity around sunset at 19:54, when the minor solunar period wraps up. Expect the south wind to strengthen to 8 knots gusting 18 by midday, so use the morning calm for drifting or anchoring. Surfing is only a 5.5 today. The swell is minimal—0.38 meters at 3.3 seconds from 159 degrees—and the onshore south wind won’t help. Waves will be choppy and weak. If you’re determined to paddle out, the early window before 10:00 offers the tidiest lines, but keep expectations low. Boating and sailing score 6.6 and 7.4 respectively, with the sailing number benefiting from the building wind later on. However, the afternoon gusts near 22 knots and the fully overcast sky will make for a lumpy ride. Kayakers face a 5.0: the combination of building wind and persistent chop is not ideal for recreational paddling, so stick to protected waters if you’re going out. Looking back, today’s diving score matches Wednesday’s and Tuesday’s, but boating and kayaking have dropped significantly from the excellent 8s earlier in the week. The south wind is the culprit—those calm, high-pressure days from August 23-25 are gone for now. The next few days offer a reset. Winds relax Friday, with peaks around 8 knots and smaller waves. Saturday brings a 61% chance of rain but lighter wind, and Sunday through Tuesday look increasingly sunny and calm, with wave heights holding around 0.4 meters and precipitation chances dropping sharply. By Tuesday, highs near 33°C and a dry forecast will make for excellent all-around conditions. Best bet: Get on the water early if you’re diving or fishing—the south wind rules the afternoon, but the morning belongs to you.