Local weather forecast

Weather in Old Greenwich, CT

Updated 2026-08-11 11:15 local time · ZIP codes 06870

Sunny
Now86°F

Sunny

High / Low91° / 70°
Rain chance19%
Wind5 mph
Weather alerts

Active alerts

2
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.

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

NowSunny86°8% rain
12 PMSunny87°5% rain
1 PMSunny88°4% rain
2 PMSunny90°3% rain
3 PMSunny91°3% rain
4 PMSunny90°3% rain
5 PMSunny89°2% rain
6 PMSunny85°4% rain
7 PMPartly Cloudy82°8% rain
8 PMPatchy rain nearby75°29% rain
9 PMPatchy rain nearby75°38% rain
10 PMClear74°14% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
91° 70°Sunny
Rain 19%Gust 9 mph
Tomorrow2026-08-12
Sunny
86° 67°Sunny
Rain 57%Gust 9 mph
Thursday2026-08-13
Sunny
86° 68°Sunny
Rain 57%Gust 12 mph
Conditions

Weather details

Feels like97°F
Humidity77%
Pressure29.87 inHg
Visibility6 mi
Wind5 mph WNW
Wind gusts6 mph
Precipitation0.00 in
UV index5
Daylight

Sunrise, sunset and moon

Sunrise06:00 AM
Sunset07:58 PM
Moonrise03:56 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella may help

There is a moderate rain chance, peaking near 38%.

Choose light, breathable clothing

It feels like 97°F with winds near 5 mph.

Best window: 7 PM

82°F, 8% rain chance and 8 mph wind.

Driving conditions look generally normal

Visibility is around 6 mi; gusts may reach 15 mph.

Running conditions are less comfortable

Current temperature is 86°F, wind 5 mph, rain chance up to 38%.

Moderate UV protection recommended

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

Old Greenwich weather today

Sunny and 86°F in Old Greenwich, CT. Today's high is 91°F with a 19% rain chance. Winds are around 5 mph with gusts near 6 mph. Relative humidity is 77%, pressure is 29.87 inHg, and visibility is about 6 miles.

Tonight and tomorrow in Old Greenwich

Sunrise is at 06:00 AM and sunset is at 07:58 PM. Tomorrow's forecast calls for Sunny with a high near 86°F and a low near 67°F. The maximum rain chance is 57%.

Nearby

Weather near Old Greenwich

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