National Weather Service United States Department of Commerce

Developing storm will spread rain across eastern U.S.; thunderstorms in the Southeast

A storm system developing in the South will move up the Mississippi River Valley on Sunday bringing rainfall to much of the eastern U.S., along with thunderstorms in the southeastern states. Some of the thunderstorms in the Southeast could produce large hail, damaging wind and heavy rain.
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Hazardous Weather Conditions

Current Conditions

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Port Jefferson NY

7 Day Forecast

For More Weather Information:

New York, NY Local Forecast Office

Tonight

Cloudy

Cloudy

Low: 37 °F

Sunday

Partly Sunny

Partly
Sunny

High: 51 °F

Sunday
Night

Rain Chance for Measurable Precipitation 90%

Rain

Low: 48 °FRising Temperatures

Monday

Rain Chance for Measurable Precipitation 80%

Rain

High: 65 °F

Monday
Night

Slight Chance Showers Chance for Measurable Precipitation 20%

Slight Chc
Showers

Low: 49 °F

Tuesday

Breezy

Breezy

High: 53 °F

Tuesday
Night

Mostly Cloudy

Mostly
Cloudy

Low: 38 °F

Wednesday

Rain Likely Chance for Measurable Precipitation 60%

Rain
Likely

High: 43 °F

Wednesday
Night

Rain/Snow Likely Chance for Measurable Precipitation 60%

Rain/Snow
Likely

Low: 35 °F

Detailed Forecast

  • Tonight Cloudy, with a low around 37. Southwest wind 9 to 16 mph.
  • Sunday Partly sunny, with a high near 51. Wind chill values between 35 and 45 early. Southwest wind 8 to 10 mph.
  • Sunday Night Rain, mainly after midnight. Temperature rising to around 54 by 5am. South wind 7 to 16 mph becoming southeast after midnight. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
  • Monday Rain and possibly a thunderstorm before 10am, then a chance of rain. High near 65. Breezy, with a south wind 22 to 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
  • Monday Night A slight chance of showers. Mostly cloudy, with a low around 49. West wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
  • Tuesday Mostly sunny, with a high near 53. Breezy.
  • Tuesday Night Mostly cloudy, with a low around 38.
  • Wednesday Rain likely. Mostly cloudy, with a high near 43. Chance of precipitation is 60%.
  • Wednesday Night Rain and snow likely. Mostly cloudy, with a low around 35. Chance of precipitation is 60%.
  • Thanksgiving Day Partly sunny, with a high near 44.
  • Thursday Night A chance of snow showers. Mostly cloudy, with a low around 34. Chance of precipitation is 30%.
  • Friday Mostly sunny, with a high near 42.
  • Friday Night Partly cloudy, with a low around 29.
  • Saturday Mostly sunny, with a high near 38.