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Threemile Harbor, New York Weather Forecast
Threemile Harbor, New York Weather
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Weather Forecast for Threemile Harbor, New York : Suffolk County
Issued: 12:38 pm EST Dec 21, 2025 Latitude: 41.0159332 Longitude: -72.1795229 View on Google Maps

MouseOver for Detail Forecast
Tonight Monday Tuesday Wednesday Christmas Day Friday Saturday Sunday
Mostly Clear on Tonight Sunny on Monday 90% chance of rain & snow on Tuesday Mostly Sunny on Wednesday 30% chance of rain on Christmas Day 50% chance of rain on Friday 30% chance of rain on Saturday 50% chance of rain on Sunday
Low: 30°F High: 38°F High: 43°F High: 42°F High: 44°F High: 48°F High: 41°F High: 44°F
Low: 35°F Low: 41°F Low: 34°F Low: 40°F Low: 36°F Low: 35°F  
Mostly Clear Sunny Rain & Snow Mostly Sunny Rain Rain Rain Rain
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Current Conditions at
MONTAUK - (KMTP)
36°
Feels like 25°F
Clear
as of 5:54 PM EST
Rel. Humidity: 37%
Dew Point: 12°F
Pressure: 30.16 in.
Wind Data
17 MPH
Gust: 30 MPH
320° Northwest
Current Conditions at
GROTON - (KGON)
34°
Feels like 23°F
Clear
as of 5:56 PM EST
Rel. Humidity: 34%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
16 MPH
Gust: 32 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
WESTHAMPTON BEACH - (KFOK)
34°
Feels like 24°F
Clear
as of 5:53 PM EST
Rel. Humidity: 40%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.19 in.
Flight Rule: VFR
Wind Data
14 MPH
Gust: 22 MPH
310° Northwest
Cloud Level(s): Clear
Current Conditions at
WESTERLY STATE ARPT - (KWST)
34°
Feels like 25°F
Clear
as of 5:53 PM EST
Rel. Humidity: 37%
Dew Point: 10°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
12 MPH
Gust: 22 MPH
310° Northwest
Cloud Level(s): Clear
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 30. Wind chill values between 15 and 25. Blustery, with a northwest wind 18 to 20 mph.
Sunny on Monday Monday... Sunny, with a high near 38. Wind chill values between 15 and 25. Northwest wind 10 to 18 mph.
40% chance of snow Monday Night Monday Night... A 40 percent chance of snow after 1am. Increasing clouds, with a low around 35. West wind 8 to 10 mph.
90% chance of rain & snow Tuesday Tuesday... Rain and snow, becoming all rain after 10am. High near 43. Southwest wind 7 to 13 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
20% chance of rain Tuesday Night Tuesday Night... A 20 percent chance of rain before 1am. Mostly cloudy, with a steady temperature around 41. Breezy, with a west wind 10 to 20 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 42. Breezy.
Increasing Clouds on Wednesday Night Wednesday Night... Increasing clouds, with a low around 34.
30% chance of rain Christmas Day Christmas Day... A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 44.
30% chance of rain Thursday Night Thursday Night... A 30 percent chance of rain after 1am. Cloudy, with a low around 40.
50% chance of rain Friday Friday... A 50 percent chance of rain. Cloudy, with a high near 48.
50% chance of rain Friday Night Friday Night... A 50 percent chance of rain. Mostly cloudy, with a low around 36.
30% chance of rain Saturday Saturday... A 30 percent chance of rain. Mostly cloudy, with a high near 41.
40% chance of rain Saturday Night Saturday Night... A 40 percent chance of rain. Mostly cloudy, with a low around 35.
50% chance of rain Sunday Sunday... A 50 percent chance of rain. Mostly cloudy, with a high near 44.
Current Radar Image


Sun Almanac for Threemile Harbor, New York
Sunrise: 07:10 AM
Sunset: 4:24 PM
Civil Sunrise:06:39 AM
Civil Sunset: 4:55 PM
Nautical Sunrise: 06:05 AM
Nautical Sunset: 5:29 PM
Astro Sunrise: 05:31 AM
Astro Sunset: 6:03 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.