Marine Weather Net

Winthrop, MA Weather Forecast


Marine Forecast: Boston Harbor


Winthrop, Massachusetts

 Lat: 42.38N, Lon: 70.98W

Current Conditions Updated: 254 PM EDT MON AUG 17 2026

Overcast
Temp: 74°F
  • Humidity:
  • 73%
  • Winds:
  • 8 MPH SSE
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.85 in.
  • Dewpoint:
  • 65°F
  • Heat index:
  • 75°F

  • Sunrise:
  • 5:51 AM EDT
  • Sunset:
  • 7:40 PM EDT
  • Moonrise:
  • 11:27 AM EDT
  • Moonset:
  • 9:47 PM EDT

THIS AFTERNOON

CHANCE OF SHOWERS
Lo: 67°F
Precip: 50%

TUESDAY

MOSTLY SUNNY
Hi: 80°F
Lo: 65°F

WEDNESDAY

SUNNY

Hi: 89°F
Lo: 65°F

SATURDAY

PARTLY SUNNY
Hi: 79°F
Lo: 65°F
Precip: 30%
Weather Forecast In Detail:
Forecast Issued: 104 PM EDT Mon Aug 17 2026

This Afternoon...Mostly cloudy with a 50 percent chance of showers. Patchy fog. Near steady temperature in the mid 70s. Southeast winds 5 to 10 mph.
Tonight...Mostly cloudy. A chance of showers, mainly in the evening. Patchy fog. Humid with lows in the upper 60s. North winds around 5 mph. Chance of rain 40 percent.
Tuesday...Mostly cloudy in the morning, then becoming mostly sunny. Patchy fog in the morning. Humid with highs around 80. North winds 5 to 10 mph.
Tuesday Night...Partly cloudy. Humid with lows in the mid 60s. East winds around 5 mph, becoming southwest after midnight.
Wednesday...Sunny with highs in the upper 80s. Southwest winds 5 to 10 mph.
Wednesday Night...Mostly clear. Lows in the upper 60s.
Thursday And Thursday Night...Partly cloudy. A 30 percent chance of showers. Highs in the mid 80s. Lows in the mid 60s.
Friday And Friday Night...Partly cloudy. Highs around 80. Lows in the mid 60s.
Saturday...Partly sunny with a 30 percent chance of showers. Highs in the upper 70s.
Saturday Night...Mostly cloudy with a 40 percent chance of showers. Lows in the mid 60s.
Sunday...Partly sunny with a 50 percent chance of showers. Highs in the upper 70s.
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