CatchWindow fishing intelligence

Nantucket Island, MA Daily Water Report — October 5, 2026

Nantucket gets a qualified green light today: boating, kayaking and diving rate well, but the water is not handing out free passes. The useful window is morning through early afternoon, before the evening gust ramp and with the day’s calmest seas near 10 AM. Waves hold around 0.9 to 1.1 m, with a 0.78 m easterly swell at a short 5.2-second period, so expect a persistent little roll rather than glass. The representative NNE wind is only 4 knots, but gusts are forecast to reach 29.5 knots around 7 PM—a substantial change in temperament. Boating leads the practical options at 7.5/10, with kayaking close behind at 7.2/10. Early rain is confined to roughly midnight through 5 AM, leaving the daylight period largely dry, though fully overcast skies, 98% humidity and forecast visibility near 0.2 km demand serious attention to navigation and lookout. That is atmospheric visibility, not a read on the water below. The 0.5 m/s current toward 79 degrees is another factor to plan around, particularly near the morning high at 8:17 AM and the afternoon low at 1:40 PM. Diving is the day’s highest-rated activity at 8.3/10, matching yesterday’s score and supported by modest wind and 17.6 C marine SST. Still, surface conditions and low atmospheric visibility deserve a conservative approach. Fishing scores 6.9/10, with its better timing overlapping the 7:28–9:28 AM solunar major period and the 7:28–9:28 PM evening major period; the latter coincides with the day’s strongest gust risk. Pressure is steady near 1014 hPa, but fishing has slipped from yesterday’s 7.7. Sailing is only middling at 5.6/10: light early wind may leave little to work with, while the late gust spread is more nuisance than invitation. Wildlife scores 6.4/10, with low-tide proximity around 1:40 PM offering the more favorable timing. The next few days look drier but breezier at times. Seas ease notably Tuesday and become smallest by the weekend, while winds remain capable of reaching the mid- to low-20-knot range through Friday. Best bet: launch early, use the 8 AM high-tide-to-midday stretch wisely, and be back with a plan before the evening wind starts acting expensive.