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Dennis, MA Marine Weather Forecast

Station 44090 - Cape Cod Bay, MA (221)

May 16, 2026 12:30 am EDT
Location: 41.84N 70.329W
Significant Wave Height: 1.0 ft
Dominant Wave Period: 11 sec
Average Period: 4.6 sec
Mean Wave Direction: N (356°)
Air Temperature: 50.5°F (10.3°C)
Water Temperature: 51.6°F (10.9°C)


Overnight - 49°F
May 16, 2026
6 mph W
Patchy Fog
Patchy fog after 4am. Partly cloudy, with a low around 49. West wind around 6 mph.
Saturday - 63°F
May 16, 2026
7 to 17 mph SW
Patchy Fog then Sunny
Patchy fog before 7am. Sunny, with a high near 63. Southwest wind 7 to 17 mph, with gusts as high as 28 mph.
Saturday Night - 55°F
May 16, 2026
16 to 20 mph SW
Partly Cloudy then Scattered Rain Showers
Scattered rain showers after 1am. Partly cloudy, with a low around 55. Southwest wind 16 to 20 mph. Chance of precipitation is 30%.
Sunday - 68°F
May 17, 2026
10 to 15 mph SW
Isolated Rain Showers then Mostly Sunny
Isolated rain showers before 9am. Mostly sunny, with a high near 68. Southwest wind 10 to 15 mph. Chance of precipitation is 20%.
Sunday Night - 55°F
May 17, 2026
6 to 12 mph NW
Mostly Clear
Mostly clear, with a low around 55. Northwest wind 6 to 12 mph, with gusts as high as 22 mph.
Monday - 62°F
May 18, 2026
5 to 9 mph E
Sunny
Sunny, with a high near 62. East wind 5 to 9 mph.
Monday Night - 54°F
May 18, 2026
6 to 9 mph S
Mostly Clear
Mostly clear, with a low around 54. South wind 6 to 9 mph.
Tuesday - 65°F
May 19, 2026
8 to 14 mph SW
Sunny
Sunny, with a high near 65. Southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Tuesday Night - 57°F
May 19, 2026
14 mph SW
Mostly Clear
Mostly clear, with a low around 57. Southwest wind around 14 mph.
Wednesday - 66°F
May 20, 2026
10 to 14 mph SW
Sunny
Sunny, with a high near 66. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Wednesday Night - 55°F
May 20, 2026
6 to 13 mph SW
Isolated Showers And Thunderstorms then Scattered Showers And Thunderstorms
Isolated showers and thunderstorms between 8pm and 10pm, then scattered showers and thunderstorms. Partly cloudy, with a low around 55. Southwest wind 6 to 13 mph. Chance of precipitation is 30%.
Thursday - 62°F
May 21, 2026
7 mph W
Chance Rain Showers
A chance of rain showers before 5pm. Mostly sunny, with a high near 62. West wind around 7 mph. Chance of precipitation is 40%.
Thursday Night - 52°F
May 21, 2026
5 mph NW
Partly Cloudy
Partly cloudy, with a low around 52. Northwest wind around 5 mph.
Friday - 60°F
May 22, 2026
7 mph NE
Mostly Sunny
Mostly sunny, with a high near 60. Northeast wind around 7 mph.

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