Marine Weather Net

Harpswell, ME Weather Forecast


Marine Forecast: Casco Bay


Harpswell, Maine

 Lat: 43.85N, Lon: 70.36W

Current Conditions Updated: 456 AM EDT THU SEP 17 2026

Mostly Cloudy
Temp: 56°F
  • Humidity:
  • 100%
  • Winds:
  • N/A
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.29 in.
  • Dewpoint:
  • 56°F
  • Heat index:
  • 56°F

  • Sunrise:
  • 6:20 AM EDT
  • Sunset:
  • 6:48 PM EDT
  • Moonrise:
  • 1:36 PM EDT
  • Moonset:
  • 9:51 PM EDT

TODAY

CHANCE OF SHOWERS
Hi: 71°F
Lo: 55°F
Precip: 30%

FRIDAY

MOSTLY SUNNY
Hi: 71°F
Lo: 41°F

SATURDAY

MOSTLY SUNNY
Hi: 65°F
Lo: 45°F

SUNDAY

CHANCE OF SHOWERS
Hi: 60°F
Lo: 45°F
Precip: 60%
Weather Forecast In Detail:
Forecast Issued: 440 AM EDT Thu Sep 17 2026

Today...Mostly cloudy. A chance of sprinkles this morning, then a chance of showers this afternoon. Highs in the lower 70s. Light and variable winds. Chance of rain 30 percent.
Tonight...Showers, mainly in the evening. Patchy fog. Lows in the mid 50s. Light and variable winds. Chance of rain 90 percent.
Friday...Mostly sunny. Highs in the lower 70s. Northwest winds 10 to 15 mph with gusts up to 30 mph.
Friday Night...Mostly clear. Lows in the lower 40s. Northwest winds 10 to 15 mph. Gusts up to 30 mph in the evening.
Saturday...Mostly sunny. Highs in the mid 60s. Light and variable winds.
Saturday Night...Partly cloudy. Lows in the mid 40s.
Sunday...A chance of showers in the morning, then showers likely in the afternoon. Highs around 60. Chance of rain 60 percent.
Sunday Night...Showers likely in the evening. Lows in the mid 40s. Chance of rain 60 percent.
Monday...Partly sunny. Highs in the mid 60s.
Monday Night...Partly cloudy. Lows in the lower 40s.
Tuesday...Partly sunny. Highs in the lower 60s.
Tuesday Night...Mostly clear. Lows in the lower 40s.
Wednesday...Mostly sunny. Highs in the mid 60s.
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