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Old Greenwich, CT Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Saturday
Sunny, with a high near 57.
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Saturday Night
Clear, with a low around 40.
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Sunday
Sunny, with a high near 63.
National Weather Service forecast updated 2 days ago.
Hourly
Hourly forecast- Now52°
- 12 PM54°
- 1 PM56°
- 2 PM56°
- 3 PM57°
- 4 PM57°
- 5 PM57°
- 6 PM55°
- 7 PM52°
- 8 PM50°
- 9 PM49°
- 10 PM47°
- 11 PM46°
- Sun12 AM45°
- 1 AM44°
- 2 AM43°
- 3 AM42°
- 4 AM41°
- 5 AM41°
- 6 AM40°
- 7 AM40°
- 8 AM42°
- 9 AM46°
- 10 AM51°
10-day forecast
Details- WedOct 21Mostly Sunny45°61°
- ThuOct 22Sunny42°63°
- FriOct 23Sunny39°55°
- TodayOct 24Sunny40°57°
- SunOct 25Sunny45°63°
- MonOct 26Sunny49°67°
- TueOct 27Mostly Sunny45°61°
- WedOct 28Cloudy46°56°
- ThuOct 29Rain0.06 in45°55°
- FriOct 30Cloudy55°66°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in Connecticut
More weather news-
Cold Halloween night expected in Connecticut. See full holiday forecastAccuWeather just released its Halloween weekend forecast, predicting "a spooky mix of chilly temperatures, gusty winds, rain and even mountain snow" across the country. While the weather service predicts New England…
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Will Connecticut’s Halloween be warmer or colder than normal? Here’s the early outlookCostumed children and their parents pack Main Street as they trick or treat at downtown businesses during the annual Halloween Parade in Westport, Conn. on Tuesday, October 29, 2024. The weather will trend close to…
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Here's the latest on the nor'easter brewing offshore this week, and what it means for ConnecticutSatellite imagery shows a nor'easter off the eastern coast of the United States Wednesday, Oct. 21, 2026. A nor'easter continues to churn off the East Coast this week, threatening to bring coastal flooding to parts of…
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Connecticut stays dry Wednesday as nor’easter passes offshore. Here's what to expect.Temperatures turn slightly cooler for Connecticut Wednesday, while a nor'easter meandering off the East Coast may bring gusty winds. Highs will top out in the upper 50s and lower 60s Wednesday — down from the upper 60s…
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Nor’easter will stay offshore, but Connecticut faces gusty winds WednesdayA nor'easter swirling off the East Coast will stay offshore as it moves north this week, bringing some strong winds to Connecticut. A nor'easter is hanging out off the East Coast of the U.S. this week, and while it's…
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A warmer Tuesday in Connecticut with a mix of sun and clouds. Here's when the chill sets in again.Leaves begin to change color at a home on Sport Hill Road in Easton on Oct. 7, 2026. Another day of seasonable fall weather is in store for Connecticut Tuesday — but expect it to be a little cloudier and breezier than…
- Wfsb says Connecticut stays mostly dry as offshore storm nears
Wfsb says Connecticut should stay mostly dry and mild this week as a nor’easter strengthens offshore, with only a low chance of rain late Wednesday and Wednesday night in southeastern Connecticut. Most of the state…
Air quality
Forecast
- SatGood (50)
- SunModerate (52)
- MonModerate (58)
Greenwich, CT reporting area. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyWestchester Co Ap, records since 1948. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- The Bronx 32 km
- Yonkers 30 km
- Bridgeport 36 km
- Stamford 4 km
- North Stamford 13 km
- Norwalk 17 km
- Greenburgh 23 km
- East Norwalk 17 km
- New Rochelle 22 km
- Mount Vernon 26 km
- Brentwood 38 km
- Fairfield 28 km
Forecasters' discussion
From the National Weather Service office in OKX, issued 3 hrs ago
What Has Changed
No significant changes with the latest forecast update.
Key Messages
1) Dry conditions continue through much of next week.
2) Frost expected inland and across eastern Long Island this morning and then likely again late tonight into early Sunday morning.
3) One last round of spotty minor coastal flooding possible along the back bays of southern Nassau County for the morning high tide.
Key Message 1
High pressure building from the north will settle over the area this weekend, then drift south on Monday. A cold front moving through Monday night will be moisture starved. High pressure and dry conditions then return for the rest of the week.
.KEY MESSAGE 2... Under mainly clear skies and light winds thanks to high pressure, radiational cooling is expected each night through Sunday night for the outlying areas. Temperatures each night are expected to drop into the 30s with some 25-30 readings possible well inland and in parts of the Long Island Pine Barrens.
Frost Advisories remain in effect for coastal Connecticut, coastal Westchester and Eastern Suffolk County with patchy frost also possible in parts of western Suffolk County. Frost is not expected across the remainder of Long Island, NYC, and the surrounding nearby suburbs where temperatures should remain too warm.
Similar temperatures are expected late tonight into early Sunday morning. Another round of Frost Advisories are likely for the aforementioned areas for that time frame.
Upper level ridging throughout the column Saturday night will mean introduction of some slightly warmer air, so frost may be more patchy Sunday night into Monday morning.
.KEY MESSAGE 3... With the approach of a full moon late this weekend and a persistent easterly swell, water levels will be elevated through the next several high tide cycles. Brief minor flooding of the more vulnerable locations near the waterfront and shoreline is possible for the Nassau south shore bays with this morning's high tide cycle.
Outlook For 12z Sunday Through Wednesday
Saturday Night through Wednesday: VFR.
Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.