Local weather forecast

Weather in Great River, NY

Updated 2026-08-11 13:00 local time · ZIP codes 11739

Now82°F

Cloudy

High / Low93° / 70°

Rain chance57%

Wind7 mph

Weather alerts

Active alerts

Coastal Flood Statement issued August 11 at 2:34AM EDT until August 11 at 9:00PM 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...Southern Queens and Southern Nassau Counties. * 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

82°2% rain

2 PM

93°2% rain

3 PM

88°1% rain

4 PM

93°1% rain

5 PM

92°1% rain

6 PM

87°3% rain

7 PM

82°7% rain

8 PM

79°24% rain

9 PM

75°70% rain

10 PM

75°58% rain

11 PM

75°15% rain

12 AM

74°15% rain

Forecast

3-day weather forecast

Today2026-08-11

93° 70°Sunny

Rain 57%Gust 10 mph

Tomorrow2026-08-12

83° 66°Sunny

Rain 67%Gust 11 mph

Thursday2026-08-13

83° 74°Patchy rain nearby

Rain 60%Gust 10 mph

Conditions

Weather details

Feels like85°F

Humidity66%

Pressure29.84 inHg

Visibility10 mi

Wind7 mph W

Wind gusts8 mph

Precipitation0.00 in

UV index7

Daylight

Sunrise, sunset and moon

Sunrise05:59 AM

Sunset07:56 PM

Moonrise03:55 AM

Moon phaseNew Moon

Practical guide

Weather insights for today

Take an umbrella

Rain chance reaches about 70% over the next 12 hours.

Light layers should work

It feels like 85°F with winds near 7 mph.

Best window: 1 PM

82°F, 2% rain chance and 7 mph wind.

Use extra caution while driving

Visibility is around 10 mi; gusts may reach 16 mph.

Running conditions are less comfortable

Current temperature is 82°F, wind 7 mph, rain chance up to 70%.

High UV protection needed

UV index is 7. Sunscreen, shade and protective clothing are recommended.

Great River weather today

Cloudy and 82°F in Great River, NY. Today's high is 93°F with a 57% rain chance. Winds are around 7 mph with gusts near 8 mph. Relative humidity is 66%, pressure is 29.84 inHg, and visibility is about 10 miles.

Tonight and tomorrow in Great River

Sunrise is at 05:59 AM and sunset is at 07:56 PM. Tomorrow's forecast calls for Sunny with a high near 83°F and a low near 66°F. The maximum rain chance is 67%.

Nearby

Weather near Great River

East Islip, NY~1 mi away Oakdale, NY~2 mi away Islip Terrace, NY~2 mi away Islip, NY~3 mi away West Sayville, NY~3 mi away Bohemia, NY~3 mi away Central Islip, NY~4 mi away Sayville, NY~4 mi away

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