Marine Weather Net

South Yarmouth, MA Weather Forecast


Marine Forecast: Nantucket Sound


South Yarmouth, Massachusetts

 Lat: 41.67N, Lon: 70.19W

Current Conditions Updated: 316 PM EDT MON AUG 17 2026

Light Rain
Temp: 69°F
  • Humidity:
  • 92%
  • Winds:
  • 6 MPH ESE
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.85 in.
  • Dewpoint:
  • 67°F
  • Heat index:
  • 69°F

  • Sunrise:
  • 5:49 AM EDT
  • Sunset:
  • 7:36 PM EDT
  • Moonrise:
  • 11:23 AM EDT
  • Moonset:
  • 9:46 PM EDT

THIS AFTERNOON

SHOWERS
Lo: 70°F
Precip: 60%

TUESDAY

PARTLY SUNNY
Hi: 79°F
Lo: 67°F

WEDNESDAY

SUNNY

Hi: 81°F
Lo: 70°F

THURSDAY

MOSTLY SUNNY
Hi: 81°F
Lo: 69°F
Weather Forecast In Detail:
Forecast Issued: 104 PM EDT Mon Aug 17 2026

This Afternoon...Showers likely. Patchy fog. Near steady temperature in the mid 70s. Southeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent.
Tonight...Cloudy. A chance of showers with isolated thunderstorms, mainly in the evening. Patchy fog. Humid. Near steady temperature in the lower 70s. Southeast winds 5 to 10 mph with gusts up to 20 mph, becoming north after midnight. Chance of rain 50 percent.
Tuesday...Mostly cloudy in the morning, then becoming partly sunny. Patchy fog in the morning. Humid with highs in the upper 70s. North winds 5 to 10 mph.
Tuesday Night...Partly cloudy. Humid with lows in the upper 60s. Northwest winds around 5 mph.
Wednesday...Sunny with highs in the lower 80s. Southwest winds 5 to 10 mph. Gusts up to 20 mph in the afternoon.
Wednesday Night...Mostly clear. Lows around 70.
Thursday...Mostly sunny. Highs in the lower 80s.
Thursday Night...Mostly cloudy with a 40 percent chance of showers. Lows in the upper 60s.
Friday...Mostly sunny. Highs in the upper 70s.
Friday Night...Mostly cloudy. Lows in the mid 60s.
Saturday...Partly sunny with a 40 percent chance of showers. Highs in the mid 70s.
Saturday Night And Sunday...Mostly cloudy. A 50 percent chance of showers. Lows in the mid 60s. Highs in the upper 70s.
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