Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 951 AM EST SAT DEC 27 2025

Mostly Cloudy
Temp: 11°F
  • Humidity:
  • 63%
  • Winds:
  • 10 MPH N
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.19 in.
  • Dewpoint:
  • 1°F
  • Heat index:
  • 11°F

  • Sunrise:
  • 7:12 AM EST
  • Sunset:
  • 4:09 PM EST
  • Moonrise:
  • 11:16 AM EST
  • Moonset:
  • N/A EST

TODAY

PARTLY SUNNY
Hi: 21°F
Lo: 10°F

SUNDAY

MOSTLY SUNNY
Hi: 35°F
Lo: 19°F

MONDAY

RAIN
Hi: 39°F
Lo: 20°F
Precip: 90%

TUESDAY

PARTLY SUNNY
Hi: 29°F
Lo: 13°F
Weather Forecast In Detail:
Forecast Issued: 705 AM EST Sat Dec 27 2025

Today...Cloudy this morning, then becoming partly sunny. Highs in the lower 20s. North winds around 10 mph with gusts up to 20 mph. Wind chill values as low as 1 below this morning.
Tonight...Mostly clear. Lows around 10 above. Light and variable winds.
Sunday...Mostly sunny. Highs in the mid 30s. Light and variable winds.
Sunday Night...Mostly cloudy. Freezing rain likely with a chance of snow after midnight. Little or no snow accumulation. Lows around 19. Light and variable winds. Chance of precipitation 70 percent.
Monday...Freezing rain and rain in the morning, then rain in the afternoon. Highs in the upper 30s. Light and variable winds, becoming south around 10 mph in the afternoon. Chance of precipitation 90 percent.
Monday Night...Rain likely in the evening, then partly cloudy after midnight. Lows around 20. Chance of rain 70 percent.
Tuesday...Partly sunny. Highs in the upper 20s.
Tuesday Night...Partly cloudy. Lows 10 to 15.
Wednesday...Partly sunny. Highs around 30.
Wednesday Night...Mostly cloudy in the evening, then becoming partly cloudy. Lows 15 to 20.
New Years Day...Partly sunny. A chance of snow in the afternoon. Highs in the upper 20s. Chance of snow 30 percent.
Thursday Night...Partly cloudy. Lows around 10 above.
Friday...Partly sunny. Highs in the lower 20s.
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