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Plum Island, MA - Merrimack River Entrance Marine Weather Forecast

Overnight - 64°F
Oct 02, 2026
8 mph SW
Partly Cloudy
Partly cloudy, with a low around 64. Southwest wind around 8 mph.
Friday - 82°F
Oct 02, 2026
8 to 13 mph SW
Mostly Sunny then Chance Rain Showers
A chance of rain showers after 5pm. Mostly sunny, with a high near 82. Southwest wind 8 to 13 mph. Chance of precipitation is 40%.
Friday Night - 55°F
Oct 02, 2026
9 mph NW
Rain Showers Likely then Mostly Cloudy
Rain showers likely before 10pm. Mostly cloudy, with a low around 55. Northwest wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Saturday - 65°F
Oct 03, 2026
6 to 9 mph N
Sunny
Sunny, with a high near 65. North wind 6 to 9 mph.
Saturday Night - 47°F
Oct 03, 2026
1 to 6 mph NE
Mostly Clear then Patchy Fog
Patchy fog after midnight. Mostly clear, with a low around 47. Northeast wind 1 to 6 mph.
Sunday - 61°F
Oct 04, 2026
6 to 9 mph E
Patchy Fog then Slight Chance Rain Showers
Patchy fog before 9am, then a slight chance of rain showers. Mostly sunny, with a high near 61. East wind 6 to 9 mph. Chance of precipitation is 20%.
Sunday Night - 48°F
Oct 04, 2026
2 to 6 mph NE
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 48. Northeast wind 2 to 6 mph. Chance of precipitation is 30%.
Monday - 67°F
Oct 05, 2026
3 to 12 mph W
Chance Rain Showers then Partly Sunny
A chance of rain showers before 11am. Partly sunny, with a high near 67. West wind 3 to 12 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Monday Night - 40°F
Oct 05, 2026
12 mph NW
Mostly Clear
Mostly clear, with a low around 40. Northwest wind around 12 mph, with gusts as high as 23 mph.
Tuesday - 56°F
Oct 06, 2026
9 to 14 mph NW
Sunny
Sunny, with a high near 56. Northwest wind 9 to 14 mph, with gusts as high as 25 mph.
Tuesday Night - 38°F
Oct 06, 2026
5 to 8 mph NW
Clear
Clear, with a low around 38. Northwest wind 5 to 8 mph.
Wednesday - 59°F
Oct 07, 2026
7 mph SW
Sunny
Sunny, with a high near 59. Southwest wind around 7 mph.
Wednesday Night - 45°F
Oct 07, 2026
8 mph SW
Mostly Clear
Mostly clear, with a low around 45. Southwest wind around 8 mph.
Thursday - 65°F
Oct 08, 2026
6 to 9 mph SW
Sunny
Sunny, with a high near 65. Southwest wind 6 to 9 mph.

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