Local weather forecast

Weather in Port Jefferson, NY

Updated 2026-08-11 11:15 local time · ZIP codes 11777

Now84°F

Sunny

High / Low88° / 72°

Rain chance36%

Wind4 mph

Weather alerts

Active alerts

Coastal Flood Statement issued August 11 at 2:34AM EDT until August 12 at 12:00AM EDT by NWS Upton NY

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...In Connecticut, Southern Fairfield County. In New York, Southern Westchester County. * WHEN...This evening. * IMPACTS...Brief minor flooding of the most vulnerable locations near the waterfront and shoreline * ADDITIONAL DETAILS...Additional rounds of localized minor flooding are likely with the Wednesday Night and Thursday Night high tides. Minor coastal flooding could be a bit more widespread with the Wednesday night high tide.

Safety instructions

Do not drive through flooded roadways.

Hourly

Next hours

Now

84°8% rain

12 PM

85°8% rain

1 PM

86°6% rain

2 PM

87°4% rain

3 PM

88°3% rain

4 PM

87°3% rain

5 PM

87°2% rain

6 PM

85°3% rain

7 PM

83°3% rain

8 PM

79°5% rain

9 PM

76°35% rain

10 PM

75°48% rain

Forecast

3-day weather forecast

Today2026-08-11

88° 72°Sunny

Rain 36%Gust 11 mph

Tomorrow2026-08-12

81° 66°Sunny

Rain 68%Gust 10 mph

Thursday2026-08-13

82° 72°Patchy rain nearby

Rain 57%Gust 8 mph

Conditions

Weather details

Feels like93°F

Humidity79%

Pressure29.87 inHg

Visibility6 mi

Wind4 mph W

Wind gusts6 mph

Precipitation0.00 in

UV index5

Daylight

Sunrise, sunset and moon

Sunrise05:58 AM

Sunset07:56 PM

Moonrise03:54 AM

Moon phaseNew Moon

Practical guide

Weather insights for today

Umbrella may help

There is a moderate rain chance, peaking near 48%.

Choose light, breathable clothing

It feels like 93°F with winds near 4 mph.

Best window: 8 PM

79°F, 5% rain chance and 7 mph wind.

Allow a little extra driving time

Visibility is around 6 mi; gusts may reach 18 mph.

Run with a few weather adjustments

Current temperature is 84°F, wind 4 mph, rain chance up to 48%.

Moderate UV protection recommended

UV index is 5. Sunscreen and sunglasses are sensible for longer outdoor time.

Port Jefferson weather today

Sunny and 84°F in Port Jefferson, NY. Today's high is 88°F with a 36% rain chance. Winds are around 4 mph with gusts near 6 mph. Relative humidity is 79%, pressure is 29.87 inHg, and visibility is about 6 miles.

Tonight and tomorrow in Port Jefferson

Sunrise is at 05:58 AM and sunset is at 07:56 PM. Tomorrow's forecast calls for Sunny with a high near 81°F and a low near 66°F. The maximum rain chance is 68%.

Nearby

Weather near Port Jefferson

East Setauket, NY~2 mi away Mount Sinai, NY~3 mi away Port Jefferson Station, NY~3 mi away Stony Brook, NY~4 mi away Miller Place, NY~5 mi away Sound Beach, NY~5 mi away Centereach, NY~6 mi away Coram, NY~6 mi away

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