Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 851 AM EST SUN JAN 18 2026

Overcast
Temp: 27°F
  • Humidity:
  • 100%
  • Winds:
  • N/A
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.05 in.
  • Dewpoint:
  • 27°F
  • Heat index:
  • 27°F

  • Sunrise:
  • 7:09 AM EST
  • Sunset:
  • 4:31 PM EST
  • Moonrise:
  • 7:25 AM EST
  • Moonset:
  • 4:18 PM EST

TONIGHT

CLOUDY
Lo: 25°F

SUNDAY

CHANCE OF SNOW
Hi: 35°F
Lo: 21°F
Precip: 30%

MARTIN LUTHER KING JR DAY

PARTLY SUNNY
Hi: 31°F
Lo: 14°F
Precip: 60%

TUESDAY

MOSTLY SUNNY
Hi: 21°F
Lo: 8°F
Weather Forecast In Detail:
Forecast Issued: 705 AM EST Sun Jan 18 2026

WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 1 PM EST MONDAY
Rest Of Tonight...Cloudy. Lows in the mid 20s. Light and variable winds.
Sunday...Cloudy. A slight chance of snow in the morning, then a chance of snow in the afternoon. Highs in the mid 30s. Light and variable winds. Chance of snow 30 percent.
Sunday Night...Snow. Snow May be heavy at Times in the evening. Snow accumulation of 3 to 6 inches. Lows in the lower 20s. Light and variable winds. Chance of snow 90 percent.
Martin Luther King Jr Day...Mostly cloudy with snow likely in the morning, then partly sunny with a chance of snow in the afternoon. Little or no additional snow accumulation. Highs in the lower 30s. Light and variable winds, becoming southwest around 10 mph with gusts up to 20 mph in the afternoon. Chance of snow 60 percent.
Monday Night...Partly cloudy in the evening, then becoming mostly clear. Lows around 14. Southwest winds 10 to 15 mph with gusts up to 25 mph.
Tuesday...Mostly sunny. Highs in the lower 20s.
Tuesday Night...Mostly clear. Lows 5 to 10 above.
Wednesday...Mostly sunny in the morning, then becoming mostly cloudy. Highs in the upper 20s.
Wednesday Night...Mostly cloudy with a 40 percent chance of snow. Lows around 20.
Thursday...Partly sunny. Highs in the mid 30s.
Thursday Night...Partly cloudy in the evening, then clearing. Lows 10 to 15.
Friday...Partly sunny. Highs in the mid 20s.
Friday Night...Partly cloudy in the evening, then becoming mostly cloudy. Lows 10 to 15.
Saturday...Mostly cloudy. Highs in the mid 20s.
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