Marine Weather Net

Castine, ME Weather Forecast


Marine Forecast: Penobscot Bay


Castine, Maine

 Lat: 44.39N, Lon: 68.8W

Current Conditions Updated: 556 PM EST SUN JAN 18 2026

Fair
Temp: 30°F
  • Humidity:
  • 88%
  • Winds:
  • N/A
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.94 in.
  • Dewpoint:
  • 27°F
  • Heat index:
  • 30°F

  • Sunrise:
  • 7:05 AM EST
  • Sunset:
  • 4:23 PM EST
  • Moonrise:
  • 7:22 AM EST
  • Moonset:
  • 4:09 PM EST

TONIGHT

SNOW
Lo: 21°F
Precip: 90%

MARTIN LUTHER KING JR DAY

CHANCE OF SNOW
Hi: 31°F
Lo: 18°F
Precip: 40%

TUESDAY

MOSTLY SUNNY
Hi: 21°F
Lo: 10°F

WEDNESDAY

MOSTLY SUNNY
Hi: 29°F
Lo: 21°F
Weather Forecast In Detail:
Forecast Issued: 1242 PM EST Sun Jan 18 2026

WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 6 AM EST MONDAY
Tonight...Snow. Snow accumulation of 3 to 5 inches. Lows in the lower 20s. North winds 5 to 10 mph with gusts up to 25 mph. Chance of snow 90 percent.
Martin Luther King Jr Day...Mostly cloudy. A chance of snow in the afternoon. Additional snow accumulation around an inch possible. Highs in the lower 30s. Northwest winds 5 to 10 mph, becoming southwest in the afternoon. Chance of snow 40 percent.
Monday Night...Mostly cloudy with a chance of snow in the evening, then partly cloudy after midnight. Little or no additional snow accumulation. Lows around 18. Southwest winds 10 to 15 mph with gusts up to 35 mph. Chance of snow 50 percent.
Tuesday...Mostly sunny. Highs in the lower 20s. West winds 15 to 20 mph with gusts up to 35 mph.
Tuesday Night...Partly cloudy in the evening, then clearing. Lows 7 to 13 above. West winds 10 to 15 mph with gusts up to 35 mph.
Wednesday...Mostly sunny. Highs in the upper 20s.
Wednesday Night...Cloudy with a 50 percent chance of snow. Not as cool with lows in the lower 20s. Temperature rising into the upper 20s after midnight.
Thursday...Mostly cloudy. Snow likely in the morning, then a chance of rain and snow in the afternoon. Not as cool with highs in the upper 30s. Chance of precipitation 60 percent.
Thursday Night...Mostly cloudy in the evening, then becoming partly cloudy. Lows 15 to 20.
Friday...Mostly sunny. Cooler with highs in the lower 20s.
Friday Night...Mostly cloudy. Lows 5 to 10 above.
Saturday...Partly sunny. Highs 15 to 20.
Saturday Night...Partly cloudy in the evening, then becoming mostly cloudy. Lows zero to 5 above zero.
Sunday...Mostly sunny. Highs 10 to 15.
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