Marine Weather Net

Harwich, MA Weather Forecast


Marine Forecast: Nantucket Sound


Harwich, Massachusetts

 Lat: 41.69N, Lon: 70.08W

Current Conditions Updated: 452 PM EDT WED AUG 26 2026

Clear


Temp: 73°F
  • Humidity:
  • 70%
  • Winds:
  • 6 MPH SSE
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.06 in.
  • Dewpoint:
  • 63°F
  • Heat index:
  • 75°F

  • Sunrise:
  • 5:58 AM EDT
  • Sunset:
  • 7:22 PM EDT
  • Moonrise:
  • 6:47 PM EDT
  • Moonset:
  • 4:09 AM EDT

TONIGHT

MOSTLY CLOUDY
Lo: 69°F

THURSDAY

MOSTLY SUNNY
Hi: 79°F
Lo: 67°F

FRIDAY

MOSTLY SUNNY
Hi: 79°F
Lo: 65°F

SUNDAY

SUNNY

Hi: 79°F
Lo: 69°F
Weather Forecast In Detail:
Forecast Issued: 402 PM EDT Wed Aug 26 2026

Tonight...Mostly clear this evening, then becoming mostly cloudy. Lows in the upper 60s. Southwest winds around 5 mph.
Thursday...Mostly sunny. Humid with highs in the upper 70s. South winds 10 to 15 mph.
Thursday Night...Partly cloudy in the evening, then mostly cloudy with a chance of showers after midnight. Humid with lows in the upper 60s. South winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 40 percent.
Friday...Mostly sunny. Humid with highs in the upper 70s. South winds 5 to 10 mph.
Friday Night...Partly cloudy. Humid with lows in the mid 60s. Southwest winds 5 to 10 mph, becoming northwest with gusts up to 20 mph after midnight.
Saturday And Saturday Night...Partly cloudy. Highs in the mid 70s. Lows in the mid 60s.
Sunday...Sunny. Highs in the upper 70s.
Sunday Night...Mostly cloudy. Lows in the upper 60s.
Monday...Mostly sunny. Highs in the upper 70s.
Monday Night And Tuesday...Mostly cloudy. Lows in the upper 60s. Highs in the mid 70s.
Tuesday Night And Wednesday...Mostly cloudy. A 30 percent chance of showers. Lows in the mid 60s. Highs in the upper 70s.
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