Marine Weather Net

South Yarmouth, MA Weather Forecast


Marine Forecast: Nantucket Sound


South Yarmouth, Massachusetts

 Lat: 41.67N, Lon: 70.19W

Current Conditions Updated: 1256 AM EDT MON MAY 11 2026

Overcast
Temp: 57°F
  • Humidity:
  • 86%
  • Winds:
  • 7 MPH WSW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.98 in.
  • Dewpoint:
  • 53°F
  • Heat index:
  • 57°F

  • Sunrise:
  • 5:24 AM EDT
  • Sunset:
  • 7:48 PM EDT
  • Moonrise:
  • 2:31 AM EDT
  • Moonset:
  • 1:57 PM EDT

TONIGHT

CHANCE OF SHOWERS
Lo: 50°F
Precip: 40%

MONDAY

PARTLY SUNNY
Hi: 61°F
Lo: 49°F
Precip: 20%

TUESDAY

SUNNY

Hi: 61°F
Lo: 49°F

WEDNESDAY

PARTLY SUNNY
Hi: 61°F
Lo: 51°F
Weather Forecast In Detail:
Forecast Issued: 104 AM EDT Mon May 11 2026

Rest Of Tonight...Mostly cloudy with a 40 percent chance of showers. Near steady temperature in the lower 50s. Northwest winds around 5 mph.
Monday...Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs in the lower 60s. North winds around 5 mph. Chance of rain 20 percent.
Monday Night...Mostly cloudy in the evening, then clearing. Lows in the upper 40s. Southwest winds around 5 mph, becoming northwest around 5 mph after midnight.
Tuesday...Sunny. Highs in the lower 60s. North winds 5 to 10 mph, becoming northeast in the afternoon.
Tuesday Night...Partly cloudy. Lows in the upper 40s. Southwest winds around 5 mph.
Wednesday...Partly sunny. Highs in the lower 60s.
Wednesday Night...Showers likely. Lows in the lower 50s. Chance of rain 70 percent.
Thursday...Showers. Highs in the mid 60s. Chance of rain 90 percent.
Thursday Night...Showers likely. Lows around 50. Chance of rain 70 percent.
Friday...Partly cloudy. Highs in the upper 60s. Lows in the lower 50s.
Saturday...Partly cloudy. Highs in the upper 60s. Lows in the lower 50s.
Sunday...Sunny. Highs around 70.
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