Marine Weather Net

South Yarmouth, MA Weather Forecast


Marine Forecast: Nantucket Sound


South Yarmouth, Massachusetts

 Lat: 41.67N, Lon: 70.19W

Current Conditions Updated: 356 PM EST MON DEC 15 2025

Clear


Temp: 22°F
  • Humidity:
  • 49%
  • Winds:
  • 7 MPH WNW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.05 in.
  • Dewpoint:
  • 6°F
  • Heat index:
  • 22°F

  • Sunrise:
  • 6:58 AM EST
  • Sunset:
  • 4:09 PM EST
  • Moonrise:
  • 2:56 AM EST
  • Moonset:
  • 1:09 PM EST

THIS AFTERNOON

SUNNY

Lo: 25°F

TUESDAY

SUNNY

Hi: 39°F
Lo: 30°F

WEDNESDAY

MOSTLY SUNNY
Hi: 49°F
Lo: 28°F

FRIDAY

RAIN
Lo: 25°F
Precip: 90%
Weather Forecast In Detail:
Forecast Issued: 104 PM EST Mon Dec 15 2025

This Afternoon...Sunny, cold. Near steady temperature in the mid 20s. Northwest winds 15 to 20 mph with gusts up to 30 mph.
Tonight...Partly cloudy. Near steady temperature in the mid 20s. West winds 10 to 15 mph with gusts up to 25 mph.
Tuesday...Sunny. Highs in the upper 30s. West winds 5 to 10 mph.
Tuesday Night...Mostly cloudy. Lows around 30. Southwest winds 10 to 15 mph with gusts up to 25 mph.
Wednesday...Mostly sunny. Highs in the upper 40s. Southwest winds 15 to 20 mph with gusts up to 30 mph.
Wednesday Night And Thursday...Partly cloudy. Lows in the lower 30s. Highs around 50.
Thursday Night...Rain likely. Windy with lows in the lower 40s. Temperature rising into the upper 40s after midnight. Chance of rain 70 percent.
Friday...Rain, windy with highs in the lower 50s. Temperature falling into the mid 40s in the afternoon. Chance of rain 90 percent.
Friday Night...Partly cloudy with a 30 percent chance of rain. Brisk and much cooler with lows in the mid 20s.
Saturday...Mostly sunny. Cooler with highs in the lower 40s.
Saturday Night And Sunday...Mostly cloudy with a 30 percent chance of rain. Lows in the lower 30s. Highs in the mid 40s.
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