Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 1151 PM EDT THU SEP 3 2026

Clear


Temp: 64°F
  • Humidity:
  • 93%
  • Winds:
  • 3 MPH W
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.87 in.
  • Dewpoint:
  • 62°F
  • Heat index:
  • 64°F

  • Sunrise:
  • 6:05 AM EDT
  • Sunset:
  • 7:11 PM EDT
  • Moonrise:
  • 11:12 PM EDT
  • Moonset:
  • 2:53 PM EDT

TONIGHT

MOSTLY CLOUDY
Lo: 59°F

FRIDAY

PARTLY SUNNY
Hi: 80°F
Lo: 59°F

SATURDAY

PARTLY SUNNY
Hi: 75°F
Lo: 51°F

SUNDAY

MOSTLY SUNNY
Hi: 71°F
Lo: 51°F
Weather Forecast In Detail:
Forecast Issued: 523 PM EDT Thu Sep 03 2026

Tonight...Mostly cloudy. Patchy fog. Lows in the upper 50s. Light and variable winds.
Friday...Patchy fog in the morning. Partly sunny. Highs around 80. Light and variable winds.
Friday Night...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 50s. Light and variable winds.
Saturday...Partly sunny. Highs in the mid 70s. North winds around 10 mph with gusts up to 25 mph.
Saturday Night...Partly cloudy. Lows in the lower 50s. North winds around 10 mph with gusts up to 20 mph.
Sunday...Mostly sunny. Highs in the lower 70s.
Sunday Night...Mostly clear. Lows in the lower 50s.
Labor Day...Sunny. Highs in the upper 70s.
Monday Night...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 50s.
Tuesday...Partly sunny. Highs in the upper 70s.
Tuesday Night...Partly cloudy. Lows in the lower 50s.
Wednesday...Partly sunny. Highs in the lower 70s.
Wednesday Night...Partly cloudy in the evening, then becoming mostly cloudy. A 40 percent chance of showers. Lows in the upper 50s.
Thursday...Partly sunny with a 40 percent chance of showers. Highs in the upper 70s.
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