Marine Weather Net

South Yarmouth, MA Weather Forecast


Marine Forecast: Nantucket Sound


South Yarmouth, Massachusetts

 Lat: 41.67N, Lon: 70.19W

Current Conditions Updated: 456 PM EST SAT JAN 10 2026

Light Rain
Temp: 40°F
  • Humidity:
  • 89%
  • Winds:
  • N/A
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.15 in.
  • Dewpoint:
  • 37°F
  • Heat index:
  • 40°F

  • Sunrise:
  • 7:06 AM EST
  • Sunset:
  • 4:27 PM EST
  • Moonrise:
  • N/A EST
  • Moonset:
  • 10:49 AM EST

TONIGHT

RAIN
Lo: 35°F
Precip: 100%

SUNDAY

RAIN
Lo: 29°F
Precip: 70%

MONDAY

MOSTLY SUNNY
Hi: 39°F
Lo: 30°F

TUESDAY

SUNNY

Hi: 41°F
Lo: 31°F
Weather Forecast In Detail:
Forecast Issued: 405 PM EST Sat Jan 10 2026

Tonight...Rain. Lows in the mid 30s. Southeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain near 100 percent.
Sunday...Mostly cloudy. Rain likely, mainly in the morning. Near steady temperature around 40. West winds 10 to 15 mph. Gusts up to 30 mph in the afternoon. Chance of rain 70 percent.
Sunday Night...Partly cloudy and blustery. Lows in the upper 20s. West winds 15 to 25 mph with gusts up to 45 mph.
Monday...Mostly sunny and blustery. Highs in the upper 30s. West winds 20 to 25 mph with gusts up to 40 mph, diminishing to 10 to 15 mph with gusts up to 25 mph in the afternoon.
Monday Night...Partly cloudy. Near steady temperature in the lower 30s. West winds 5 to 10 mph with gusts up to 20 mph.
Tuesday...Sunny. Highs in the lower 40s.
Tuesday Night And Wednesday...Mostly cloudy. Lows in the mid 30s. Highs in the mid 40s.
Wednesday Night...Cloudy with a 50 percent chance of rain. Lows in the lower 30s.
Thursday...Partly sunny with a 40 percent chance of rain. Highs in the upper 30s.
Thursday Night...Partly cloudy. Lows in the lower 20s.
Friday And Friday Night...Mostly cloudy. Highs in the lower 30s. Lows in the mid 20s.
Saturday...Partly sunny. Highs in the upper 30s.
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