Marine Weather Net

Portland, ME Weather Forecast


Marine Forecast: Casco Bay


Portland, Maine

 Lat: 43.66N, Lon: 70.26W

Current Conditions Updated: 951 PM EDT FRI JUL 3 2026

Clear


Temp: 78°F
  • Humidity:
  • 71%
  • Winds:
  • 6 MPH WNW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.8 in.
  • Dewpoint:
  • 68°F
  • Heat index:
  • 80°F

  • Sunrise:
  • 5:03 AM EDT
  • Sunset:
  • 8:24 PM EDT
  • Moonrise:
  • 10:43 PM EDT
  • Moonset:
  • 8:26 AM EDT

TONIGHT

THUNDER STORMS
Lo: 70°F
Precip: 20%

INDEPENDENCE DAY

MOSTLY SUNNY
Hi: 89°F
Lo: 65°F
Precip: 20%

SUNDAY

PARTLY SUNNY
Hi: 85°F
Lo: 61°F

MONDAY

PARTLY SUNNY
Hi: 80°F
Lo: 57°F
Weather Forecast In Detail:
Forecast Issued: 805 PM EDT Fri Jul 03 2026

Tonight...Mostly clear. Isolated showers and thunderstorms after midnight. Lows around 70. West winds around 10 mph with gusts up to 25 mph this evening, becoming light and variable. Chance of rain 20 percent. Heat index values in the mid 90s early this evening.
Independence Day...Mostly sunny. Isolated showers and thunderstorms in the afternoon. Warm with highs in the upper 80s. Northwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.
Saturday Night...Mostly clear. Lows in the mid 60s. Northwest winds 10 to 15 mph in the evening, becoming light and variable.
Sunday...Partly sunny. Highs in the mid 80s. Light and variable winds, becoming south around 10 mph in the afternoon.
Sunday Night...Partly cloudy. Lows in the lower 60s. Southwest winds around 10 mph in the evening, becoming light and variable.
Monday...Partly sunny. Highs around 80.
Monday Night...Partly cloudy. A chance of showers after midnight. Lows in the upper 50s. Chance of rain 40 percent.
Tuesday...Partly sunny with a 40 percent chance of showers. Highs in the lower 70s.
Tuesday Night...Partly cloudy with a 40 percent chance of showers. Lows in the upper 50s.
Wednesday...Partly sunny. A chance of showers in the morning. Highs in the upper 70s. Chance of rain 30 percent.
Wednesday Night...Partly cloudy. Lows in the lower 60s.
Thursday...Partly sunny. Warm with highs in the upper 80s.
Thursday Night...Partly cloudy. Lows in the mid 60s.
Friday...Partly sunny. A chance of showers in the afternoon. Warm with highs in the upper 80s. Chance of rain 30 percent.
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