Back

Nantucket Sound Marine Forecast

Updated 4:04am EDT May 18, 2026
Zone Map
Today
E winds around 10 kt, becoming SE this afternoon. Seas around 2 ft. Wave Detail: E 1 foot at 3 seconds and SW 1 foot at 5 seconds.
Tonight
SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 3 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight.
Tue
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 4 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon.
Tue Night
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog in the evening with vsby 1 NM or less.
Wed
SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 3 seconds. A chance of showers in the afternoon.
Wed Night
W winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and N 2 ft at 2 seconds. A chance of showers.
Thu Through Fri
E winds 10 to 15 kt with gusts up to 20 kt.
Fri Night
SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.