Old Greenwich, CT Weather

Western Connecticut Planning Region County6:54 PM EDT41.02°N, 73.56°WElevation 26 ft
Frost Advisory from 12:00 AM Sun until 9:00 AM Sun

Current conditions

Clear
55°
Clear
Feels like 55°
High 63° Sunday·Low 40° tonight
WindSW 3 mph
Humidity53%
Dew point38°
Visibility10 mi
Cloud cover3%
Sunrise7:16 AM
Sunset6:02 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Saturday Night

    Clear, with a low around 40.

  • Sunday

    Sunny, with a high near 63.

  • Sunday Night

    Mostly clear, with a low around 45.

National Weather Service forecast updated 3 days ago.

Hourly

Hourly forecast
  1. Now Clear 55°
  2. 7 PM Clear 52°
  3. 8 PM Clear 50°
  4. 9 PM Clear 49°
  5. 10 PM Clear 47°
  6. 11 PM Clear 46°
  7. Sun12 AM Clear 45°
  8. 1 AM Clear 44°
  9. 2 AM Clear 43°
  10. 3 AM Clear 42°
  11. 4 AM Clear 41°
  12. 5 AM Clear 41°
  13. 6 AM Sunny 40°
  14. 7 AM Sunny 40°
  15. 8 AM Sunny 42°
  16. 9 AM Sunny 46°
  17. 10 AM Sunny 51°
  18. 11 AM Sunny 56°
  19. 12 PM Sunny 59°
  20. 1 PM Sunny 60°
  21. 2 PM Sunny 61°
  22. 3 PM Sunny 62°
  23. 4 PM Sunny 63°
  24. 5 PM Sunny 62°

10-day forecast

Details
  1. WedOct 21 Mostly Sunny Mostly Sunny45°61°
  2. ThuOct 22 Sunny Sunny42°63°
  3. FriOct 23 Sunny Sunny39°55°
  4. TodayOct 24 Sunny Sunny40°57°
  5. SunOct 25 Sunny Sunny45°63°
  6. MonOct 26 Sunny Sunny49°67°
  7. TueOct 27 Mostly Sunny Mostly Sunny45°61°
  8. WedOct 28 Cloudy Cloudy46°56°
  9. ThuOct 29 Rain Rain0.06 in45°55°
  10. FriOct 30 Cloudy Cloudy55°66°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news in Connecticut

More weather news

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

Sunrise 7:16 AM
Sunset 6:02 PM
Daylight 10 h 45 min (−2 min 33 s tomorrow)
Waxing Gibbous · 98% lit
Moonrise 4:53 PM Moonset 5:28 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low60° / 43°
Month to date2.31 in (normal 3.35 in)

Westchester Co Ap, records since 1948. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in OKX, issued 4 hrs ago

What Has Changed

Frost Advisory issued tonight for the CT coast and far eastern LI.

Key Messages

1) Frost Advisory in effect tonight for coastal CT and far eastern LI.

2) High pressure largely in control through the upcoming week.

Key Message 1

High pressure will remain over the area tonight with light winds and clear skies. Coastal CT and eastern portions of Suffolk County on LI will likely see another night of lows in the mid 30s and as low as 25 to 30 across the Pine Barrens region of LI. While the growing season has ended across the interior, it has yet to do so at the coast (Nov 1 or 11). Thus, a frost advisory in in effect for these areas once again. The only change this go around was to remove coastal Westchester.

Elsewhere, lows will range from the upper 20s across some of the interior, to as warm as the 40s across the NYC metro. These readings are about 3 to 5 degrees below normal for most locations.

Warm advection with building heights aloft should result in warmer temperatures Sunday night and less coverage of frost.

.KEY MESSAGE 2... An anomalously strong upper ridge from the Lower Mississippi Valley into the Great Lakes will translate east into Monday. A the same time, a strong upper low tracking across central and eastern Canada will suppress the upper ridge to the south, sending a cold front across the area Monday night. The frontal passage will be dry. Otherwise, the forecast area will be dominated by high pressure through the week.

Highs will be in the 60s Sunday and Monday, possibly getting to around 70 in the NYC/NJ metro on Monday. It will then cool down behind the cold front Monday night with highs mainly in the 50s for Tuesday and Wednesday. This will be a few degrees above normal. Frost coverage at the coast, where the growing season remains in effect, looks to be patchy at this time.

It warms up for the second half of the week with temperatures projecting to be well above normal by next Friday.

Outlook For 18z Sunday Through Thursday

Sunday-Thursday: 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 4Search index and reflects what the press published. Terms of use.