Marine Weather Net

South Yarmouth, MA Weather Forecast


Marine Forecast: Nantucket Sound


South Yarmouth, Massachusetts

 Lat: 41.67N, Lon: 70.19W

Current Conditions Updated: 756 AM EDT SUN AUG 16 2026

Clear


Temp: 69°F
  • Humidity:
  • 80%
  • Winds:
  • 3 MPH N
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.14 in.
  • Dewpoint:
  • 63°F
  • Heat index:
  • 69°F

  • Sunrise:
  • 5:48 AM EDT
  • Sunset:
  • 7:37 PM EDT
  • Moonrise:
  • 10:15 AM EDT
  • Moonset:
  • 9:22 PM EDT

TODAY

SUNNY

Hi: 79°F
Lo: 65°F

MONDAY

CHANCE OF SHOWERS
Hi: 75°F
Lo: 67°F
Precip: 70%

TUESDAY

PARTLY SUNNY
Hi: 75°F
Lo: 69°F

WEDNESDAY

SUNNY

Hi: 80°F
Lo: 70°F
Weather Forecast In Detail:
Forecast Issued: 702 AM EDT Sun Aug 16 2026

Today...Sunny. Highs in the upper 70s. East winds 5 to 10 mph, becoming south 10 to 15 mph this afternoon.
Tonight...Mostly cloudy. A slight chance of showers after midnight. Not as cool with lows in the mid 60s. South winds 10 to 15 mph. Chance of rain 20 percent.
Monday...Cloudy. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the afternoon. Humid with highs in the mid 70s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent.
Monday Night...Mostly cloudy with a 50 percent chance of showers. Patchy fog. Humid with lows in the upper 60s. Northeast winds 10 to 15 mph. Gusts up to 25 mph in the evening.
Tuesday...Partly sunny. Humid with highs in the mid 70s. North winds 5 to 10 mph with gusts up to 20 mph.
Tuesday Night...Partly cloudy. Lows in the upper 60s.
Wednesday...Sunny. Highs around 80.
Wednesday Night...Partly cloudy. Lows around 70.
Thursday...Partly sunny with a chance of showers. Highs around 80. Chance of rain 50 percent.
Thursday Night...Partly cloudy with a 40 percent chance of showers. Lows in the mid 60s.
Friday...Partly cloudy. Highs in the mid 70s. Lows in the mid 60s.
Saturday...Partly cloudy. Highs in the mid 70s. Lows in the mid 60s.
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