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Plum Island, MA - Merrimack River Entrance Marine Weather Forecast

Tonight - 58°F
May 16, 2026
10 mph SW
Partly Cloudy then Chance Rain Showers
A chance of rain showers between 2am and 4am. Partly cloudy, with a low around 58. Southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Sunday - 80°F
May 17, 2026
9 mph W
Sunny
Sunny, with a high near 80. West wind around 9 mph.
Sunday Night - 52°F
May 17, 2026
3 to 7 mph N
Mostly Clear
Mostly clear, with a low around 52. North wind 3 to 7 mph.
Monday - 66°F
May 18, 2026
2 to 9 mph SE
Mostly Sunny
Mostly sunny, with a high near 66. Southeast wind 2 to 9 mph.
Monday Night - 57°F
May 18, 2026
9 mph S
Mostly Clear
Mostly clear, with a low around 57. South wind around 9 mph.
Tuesday - 86°F
May 19, 2026
7 to 10 mph SW
Sunny
Sunny, with a high near 86. Southwest wind 7 to 10 mph.
Tuesday Night - 66°F
May 19, 2026
9 mph SW
Mostly Clear
Mostly clear, with a low around 66. Southwest wind around 9 mph.
Wednesday - 88°F
May 20, 2026
7 to 12 mph SW
Mostly Sunny then Showers And Thunderstorms Likely
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 88. Southwest wind 7 to 12 mph. Chance of precipitation is 60%.
Wednesday Night - 55°F
May 20, 2026
9 mph W
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 3am. Mostly cloudy, with a low around 55. West wind around 9 mph. Chance of precipitation is 60%.
Thursday - 68°F
May 21, 2026
8 mph N
Partly Sunny
Partly sunny, with a high near 68. North wind around 8 mph.
Thursday Night - 48°F
May 21, 2026
6 mph N
Mostly Cloudy
Mostly cloudy, with a low around 48. North wind around 6 mph.
Friday - 63°F
May 22, 2026
3 to 7 mph NE
Partly Sunny
Partly sunny, with a high near 63. Northeast wind 3 to 7 mph.
Friday Night - 48°F
May 22, 2026
2 to 6 mph SW
Mostly Cloudy
Mostly cloudy, with a low around 48. Southwest wind 2 to 6 mph.
Saturday - 64°F
May 23, 2026
2 to 8 mph E
Slight Chance Rain Showers
A slight chance of rain showers after 9am. Partly sunny, with a high near 64. East wind 2 to 8 mph.

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