July weather forecast
Old Greenwich, CT

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Weather in July

July, the height of summer in Old Greenwich, comes with some of the highest temperatures approaching 81.9°F (27.7°C)-and high humidity levels from 73% to 75%. Despite the heat, the city comes alive with residents flocking to beaches, thanks to the sea temperature reaching a comfortable 70.9°F (21.6°C). In the evening, the setting sun gives way to cooler winds that offer much-needed relief. Ample sunshine combined with slightly higher pressure levels makes it a popular month for outdoor barbecuing, swimming, and sightseeing. It is indeed a month of vibrancy and high spirits in Old Greenwich.

Temperature

In Old Greenwich, July records the highest average temperatures, peaking at 81.9°F (27.7°C) and reaching a low of 69.3°F (20.7°C).

Heat index

July's mean heat index is appraised at a hot 86°F (30°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.

Humidity

The average relative humidity in July is 73%.

Rainfall

July is the month with the most rainfall. Rain falls for 17.8 days and accumulates 4.13" (105mm) of precipitation.

Snowfall

In Old Greenwich, snow does not fall in May through October.

Ocean temperature

In July, the average ocean temperature is 70.9°F (21.6°C).
Note: Swimming in water at 70.9°F (21.6°C) is not a pleasing experience for the majority. As the temperature descends from 69.8°F (21°C) to 59°F (15°C), controlling breathing becomes increasingly hard.

Daylight

In July, the average length of the day is 14h and 47min.
On the first day of the month, sunrise is at 5:26 am and sunset at 8:30 pm. On the last day of July, in Old Greenwich, sunrise is at 5:49 am and sunset at 8:11 pm EDT.

Sunshine

The month with the most sunshine is July, with an average of 10.5h of sunshine.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 in July translates into this advice:
Shield from overexposure. Defense against sun-related harm is required. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the hottest?

July registers as the month with the average highest temperatures, reaching 81.9°F (27.7°C) at its peak and 69.3°F (20.7°C) at the lowest.

What is the average July temperature?

The high-temperature during July is 81.9°F (27.7°C) and the low-temperature is 69.3°F (20.7°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is appraised at 86°F (30°C).

What is the average humidity in July?

In July, the average relative humidity is 73%.

What is the rainiest month?

The month with the most rainfall is July, when the rain falls for 17.8 days and typically aggregates up to 4.13" (105mm) of precipitation.

How much does it rain in July?

In Old Greenwich, in July, during 17.8 rainfall days, 4.13" (105mm) of precipitation is typically accumulated.

When it does not snow?

In Old Greenwich, snow does not fall in May through October.

What is the ocean temperature in July?

In Old Greenwich, Connecticut, the average seawater temperature in July is 70.9°F (21.6°C). Swimming in 70.9°F (21.6°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Old Greenwich have in July?

The average day length in July is 14h and 47min.

When is the sunrise / sunset in July?

On the first day of July, sunrise is at 5:26 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:11 pm EDT.

What month has the most sunshine?

With an average of 10.5h of sunshine, July has the most sunshine of the year.

How many hours of sunshine does Old Greenwich have in July?

The average sunshine duration in July is 10.5h.

What are the months with the highest UV index?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the UV index reading in July?

The average daily maximum UV index in July is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Old Greenwich, CT

Average temperature in July - Old Greenwich, CT
  • Average high temperature in July: 81.9°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in July: 69.3°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in July
Old Greenwich, CT

Average pressure in July - Old Greenwich, CT
  • Average pressure in July: 29.96"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in July
Old Greenwich, CT

Average wind speed in July - Old Greenwich, CT
  • Average wind speed in July: 6.6mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

Average humidity in July
Old Greenwich, CT

Average humidity in July - Old Greenwich, CT
  • Average humidity in July: 73%

The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).

Average rainfall in July
Old Greenwich, CT

Average rainfall in July - Old Greenwich, CT
  • Average rainfall in July: 4.13"

The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").

Average rainfall days in July
Old Greenwich, CT

Average rainfall days in July - Old Greenwich, CT
  • Average rainfall days in July: 17.8 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in July
Old Greenwich, CT

Average snowfall in July - Old Greenwich, CT
  • Average snowfall in July: 0"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in July
Old Greenwich, CT

Average snowfall days in July - Old Greenwich, CT
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in July
Old Greenwich, CT

Average sea temperature in July - Old Greenwich, CT
  • Average sea temperature in July: 70.9°F

The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).

Average daylight in July /
Average sunshine in July
Old Greenwich, CT

Average daylight in July / Average sunshine in July - Old Greenwich, CT
  • Average daylight in July: 14h and 5min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in July: 10h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).

Average sunshine days in July
Old Greenwich, CT

Average sunshine days in July - Old Greenwich, CT
  • Average sunshine days in July: 11.3 days

The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in July
Old Greenwich, CT

Average UV index in July - Old Greenwich, CT
  • Average UV index in July: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in July
Old Greenwich, CT

Average cloud cover in July - Old Greenwich, CT
  • Average cloud cover in July: 32

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

Average visibility in July
Old Greenwich, CT

Average visibility in July - Old Greenwich, CT
  • Average visibility in July: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Old Greenwich, Connecticut, USA

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