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Nantucket Sound Marine Forecast

Updated 10:05pm EDT Jun 19, 2025
Zone Map
Small Craft Advisory In Effect Through Friday Evening
Overnight
SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less.
Fri
SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less.
Fri Night
SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 8 seconds.
Sat
SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: W 2 ft at 5 seconds and E 1 foot at 8 seconds.
Sat Night
SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds.
Sun
SW winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers.
Sun Night
SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 10 to 15 kt after midnight. Seas 2 to 3 ft.
Mon Through Tue Night
W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.