Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 1051 PM EDT THU MAR 19 2026

Mostly Cloudy
Temp: 32°F
  • Humidity:
  • 74%
  • Winds:
  • 3 MPH SW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.16 in.
  • Dewpoint:
  • 25°F
  • Heat index:
  • 32°F

  • Sunrise:
  • 6:44 AM EDT
  • Sunset:
  • 6:51 PM EDT
  • Moonrise:
  • 6:51 AM EDT
  • Moonset:
  • 7:57 PM EDT

TONIGHT

CHANCE OF SNOW
Lo: 25°F
Precip: 20%

FRIDAY

MOSTLY SUNNY
Hi: 41°F
Lo: 31°F
Precip: 60%

SATURDAY

PARTLY SUNNY
Hi: 45°F
Lo: 29°F

SUNDAY

SNOW AND RAIN
Hi: 41°F
Lo: 29°F
Precip: 50%
Weather Forecast In Detail:
Forecast Issued: 715 PM EDT Thu Mar 19 2026

Tonight...Partly cloudy. A slight chance of snow this evening. Lows in the mid 20s. South winds around 10 mph this evening, becoming light and variable. Chance of snow 20 percent.
Friday...Mostly sunny in the morning, then mostly cloudy with rain and snow likely in the afternoon. Highs in the lower 40s. Light and variable winds, becoming south around 10 mph with gusts up to 20 mph in the afternoon. Chance of precipitation 60 percent.
Friday Night...Rain and snow in the evening, then rain likely after midnight. Lows in the lower 30s. South winds around 10 mph in the evening, becoming light and variable. Chance of precipitation 90 percent.
Saturday...Partly sunny. Highs in the mid 40s. Light and variable winds, becoming northwest around 10 mph in the afternoon.
Saturday Night...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 20s. Light and variable winds.
Sunday...Mostly cloudy with a chance of snow and rain. Highs in the lower 40s. Chance of precipitation 50 percent.
Sunday Night...Rain and snow likely. Lows in the upper 20s. Chance of precipitation 60 percent.
Monday...A chance of rain. Snow likely, mainly in the morning. Highs around 40. Chance of precipitation 60 percent.
Monday Night...Partly cloudy with a chance of snow in the evening, then mostly clear after midnight. Lows around 20. Chance of snow 30 percent.
Tuesday...Partly sunny. Highs in the upper 30s.
Tuesday Night...Partly cloudy. Lows in the lower 20s.
Wednesday...Partly sunny. A chance of snow and rain in the morning. Highs in the lower 40s. Chance of precipitation 30 percent.
Wednesday Night...Partly cloudy. Lows around 20.
Thursday...Partly sunny in the morning, then becoming mostly cloudy. Highs in the lower 40s.
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