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Block Island Sound Marine Forecast

Updated 4:06am EDT Apr 5, 2026
Zone Map
Small Craft Advisory In Effect Through Late Tonight
Today
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft at 5 seconds and E 2 ft at 7 seconds.
Tonight
SW winds 15 to 20 kt, becoming NW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft at 8 seconds and W 2 ft at 3 seconds. Patchy fog in the evening.
Mon
W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 8 seconds and W 3 ft at 4 seconds.
Mon Night
W winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 8 seconds and W 2 ft at 4 seconds. A chance of showers after midnight.
Tue
W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 2 ft at 3 seconds. A chance of showers.
Tue Night
NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at 7 seconds.
Wed Through Thu
S winds 5 to 10 kt. Seas 2 to 4 ft.
Thu Night
S winds 5 to 10 kt. Seas 3 to 5 ft.