July weather forecast and climate
Old Greenwich, CT

Weather in July

July, like June, in Old Greenwich, Connecticut, is a moderately hot summer month, with average temperature ranging between max 81.9°F (27.7°C) and min 69.3°F (20.7°C).

Temperature

July is the warmest month, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 69.3°F (20.7°C).

Heat index

In July, the average heat index is calculated to be a tropical 86.9°F (30.5°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like clothing, differences in body mass, height, and shape, metabolic differences, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Old Greenwich, the average relative humidity is 73%.

Rainfall

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.

Snowfall

May through October are months without snowfall in Old Greenwich, Connecticut.

Ocean temperature

In Old Greenwich, in July, the average water temperature is 70.9°F (21.6°C).
Note: 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).

Daylight

In July, the average length of the day is 14.8h.

Sunshine

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

UV index

Months with the highest UV index in Old Greenwich are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the warmest month in Old Greenwich?

The warmest month in Old Greenwich is July, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 69.3°F (20.7°C).

What is the temperature in July in Old Greenwich?

In July, the average high-temperature is 81.9°F (27.7°C), and the average low-temperature is 69.3°F (20.7°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in July is calculated to be 86.9°F (30.5°C).

What is the average humidity in July in Old Greenwich?

In July, the average relative humidity in Old Greenwich, Connecticut, is 73%.

What is the rainiest month in Old Greenwich?

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

How much does it rain in Old Greenwich in July?

In July, in Old Greenwich, Connecticut, the rain falls for 17.8 days. Throughout July, 4.13" (105mm) of precipitation is accumulated.

When it does not snow in Old Greenwich?

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

What is the ocean temperature in July in Old Greenwich?

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 length of the day in July in Old Greenwich, Connecticut, is 14.8h.

What month has the most sunshine in Old Greenwich?

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

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

In July, the average sunshine in Old Greenwich, Connecticut, is 10.5h.

What are the months with the highest UV index in Old Greenwich?

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

What is the UV index intensity in July in Old Greenwich?

In Old Greenwich, Connecticut, the average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

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).

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Average pressure in July
Old Greenwich, CT

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

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

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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).

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Average humidity in July
Old Greenwich, CT

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

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

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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").

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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).

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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").
Months with the least snowfall are May, June, July, August, September and October (0").

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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).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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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).

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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: 14.8h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in July: 10.5h

The month with the most sunshine is July (Average sunshine: 10.5h).
Months with the least sunshine are February and December (Average sunshine: 4.7).

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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).

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Average UV index in July
Old Greenwich, CT

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

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

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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).

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Average visibility in July
Old Greenwich, CT

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

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

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