Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 351 AM EDT THU SEP 24 2026

Clear


Temp: 43°F
  • Humidity:
  • 92%
  • Winds:
  • 3 MPH NW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.53 in.
  • Dewpoint:
  • 41°F
  • Heat index:
  • 43°F

  • Sunrise:
  • 6:28 AM EDT
  • Sunset:
  • 6:35 PM EDT
  • Moonrise:
  • 5:38 PM EDT
  • Moonset:
  • 4:05 AM EDT

TONIGHT

MOSTLY CLEAR
Lo: 41°F

THURSDAY

SUNNY

Hi: 65°F
Lo: 41°F

FRIDAY

MOSTLY CLOUDY
Hi: 69°F
Lo: 47°F

SATURDAY

CHANCE OF RAIN
Hi: 61°F
Lo: 49°F
Precip: 70%
Weather Forecast In Detail:
Forecast Issued: 227 AM EDT Thu Sep 24 2026

HIGH SURF ADVISORY IN EFFECT FROM 8 AM FRIDAY TO 8 PM EDT SUNDAY
Rest Of Tonight...Mostly clear. Lows in the lower 40s. Light and variable winds.
Thursday...Sunny. Highs in the mid 60s. Northeast winds around 10 mph, becoming east in the afternoon.
Thursday Night...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 40s. Light and variable winds, becoming north around 10 mph after midnight.
Friday...Mostly cloudy. Highs in the upper 60s. Northeast winds 10 to 15 mph with gusts up to 25 mph.
Friday Night...Cloudy. A chance of rain after midnight. Lows in the upper 40s. Northeast winds 10 to 15 mph with gusts up to 30 mph. Chance of rain 50 percent.
Saturday...A chance of rain in the morning, then rain likely in the afternoon. Highs in the lower 60s. Chance of rain 70 percent.
Saturday Night...Rain. Lows in the upper 40s. Chance of rain 80 percent.
Sunday...Rain. Highs in the lower 60s. Chance of rain 80 percent.
Sunday Night...Rain in the evening, then showers after midnight. Lows in the mid 40s. Chance of rain 80 percent.
Monday...Showers, mainly in the morning. Highs around 60. Chance of rain 80 percent.
Monday Night...Showers likely, mainly in the evening. Lows in the mid 40s. Chance of rain 60 percent.
Tuesday...Partly sunny. Highs in the mid 60s.
Tuesday Night...Partly cloudy. Lows in the mid 40s.
Wednesday...Partly sunny. Highs in the upper 60s.
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