The best times to visit Old Greenwich for ideal weather are

August 13th to October 14th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Old Greenwich Travel Info

Weather in Old Greenwich

Temperature

Average temperatures in Old Greenwich vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 28th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Old Greenwich, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 85.7°F (29.8°C) with temperatures rarely dropping below 67.3°F (19.6°C) at night.

Old Greenwich Temperatures (Fahrenheit)

Key
High
Average
Low

Old Greenwich Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Old Greenwich Perceived Temperature (F)

Key
High
Average
Low

Old Greenwich Perceived Temperature (C)

Key
High
Average
Low

 

Average Old Greenwich Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 37.4 29.6 22.2
Feb 38.6 30 22.2
Mar 48.9 39 30.6
Apr 61 50.3 40.9
May 71.9 60.7 50.8
Jun 78.8 68.6 59.7
Jul 84.2 74.4 65.7
Aug 81.8 71.9 63.3
Sep 76 66.1 57.5
Oct 64.4 55.1 46.9
Nov 53.3 44.5 36.6
Dec 44.1 36.5 29.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 3 -1.3 -5.4
Feb 3.7 -1.1 -5.4
Mar 9.4 3.9 -0.8
Apr 16.1 10.2 4.9
May 22.2 15.9 10.4
Jun 26 20.3 15.4
Jul 29 23.6 18.7
Aug 27.7 22.2 17.4
Sep 24.4 18.9 14.2
Oct 18 12.8 8.3
Nov 11.8 6.9 2.6
Dec 6.7 2.5 -1.3

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Old Greenwich are September, November, and then March. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid February. For example, on the week of February 12th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early June with an average of 3 days of significant precipitation the week of June 4th.

When can you find snow in Old Greenwich? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Old Greenwich.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Old Greenwich (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 20% 0 2.7
Feb 19% 0 2.3
Mar 18% 0 3.8
Apr 20% 0 3.5
May 24% 0 4
Jun 27% 0 5.3
Jul 21% 0 3.7
Aug 21% 0 4.3
Sep 17% 0 4.5
Oct 20% 0 3.9
Nov 18% 0 2.4
Dec 28% 0 4.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 20 0 6.9
Feb 19 0 5.8
Mar 18 0 9.7
Apr 20 0 8.9
May 24 0 10.2
Jun 27 0 13.5
Jul 21 0 9.4
Aug 21 0 10.9
Sep 17 0 11.4
Oct 20 0 9.9
Nov 18 0 6.1
Dec 28 0 12.2

 

Humidity and Wind

Old Greenwich has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is April (46.5% relative humidity), and the most humid month is September (63.3%).

Wind in Old Greenwich is usually calm. The windiest month is February, followed by March and April. February’s average wind speed of around 8.2 knots (9.4 MPH or 15.1 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid February where average top sustained speeds reach 16.9 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Old Greenwich.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 7.5 Gentle breeze 14.4 Significant breeze
Feb 8.2 Gentle breeze 15.5 Significant breeze
Mar 8.1 Gentle breeze 14.8 Significant breeze
Apr 7.5 Gentle breeze 14.5 Significant breeze
May 5.8 Light breeze 12.1 Significant breeze
Jun 5.2 Light breeze 11.6 Significant breeze
Jul 4.8 Light breeze 10.6 Significant breeze
Aug 4.6 Light breeze 10.3 Gentle breeze
Sep 5.1 Light breeze 10.6 Significant breeze
Oct 5.9 Light breeze 11.8 Significant breeze
Nov 6.6 Light breeze 12.7 Significant breeze
Dec 7.4 Gentle breeze 14.2 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 49.9%
Feb 47.6%
Mar 46.6%
Apr 46.5%
May 57.5%
Jun 62.5%
Jul 60.7%
Aug 62.4%
Sep 63.3%
Oct 61.2%
Nov 54.2%
Dec 58.3%

 

Is it Safe to Travel to Old Greenwich?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Old Greenwich, CT, US is July, followed by October and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Old Greenwich in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is very reliable. Displayed data is calculated relative to the peak, so a score of 52.8 in December means 52.8% of the tourists vs. July.

 

 

Overall Old Greenwich Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 78.5°F (25.8°C) and 41.1°F (5.1°C) with far warmer temperatures in the later months. Rain is somewhat common with 6 to 7 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the most precipitation with 6 to 8 days of precipitation per month. June – August is the busiest season for tourism in Old Greenwich, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 81°F (27.2°C) and 48.6°F (9.2°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 5 to 6 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.

Winter (December through February)

Weather is far too cold this time of year in Old Greenwich to be enjoyable for warm weather travelers. The average high during this season is between 44.9°F (7.2°C) and 33.8°F (1°C). On average, it rains or snows a fair amount: 5 to 9 times per month. These times of year are the slowest with tourists.

 

Best Times to Travel› the United States › Old Greenwich, CT, US