August weather forecast
Greenwich, CT

The straight road of North Street cutting through the green leafy suburbs of the scenic Greenwich City in Connecticut
The straight road of North Street cutting through the green leafy suburbs of the scenic Greenwich City in Connecticut

Weather in August

The last month of the summer, August, is also a moderately hot month in Greenwich, Connecticut, with an average temperature fluctuating between 68.7°F (20.4°C) and 80.6°F (27°C).

Temperature

In August, the average high-temperature is practically the same as in July - a still moderately hot 80.6°F (27°C). The average low-temperature, in August, is 68.7°F (20.4°C).

Heat index

The average heat index in August is evaluated at 84.2°F (29°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 'real feel', 'felt air temperature', 'apparent temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The least humid month is August, with an average relative humidity of 71%.

Rainfall

In August, in Greenwich, the rain falls for 16.8 days. Throughout August, 3.5" (89mm) of precipitation is accumulated. Throughout the year, in Greenwich, there are 165.6 rainfall days, and 37.64" (956mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

August is the month with the warmest seawater in Greenwich, with an average ocean temperature of 73°F (22.8°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 73°F (22.8°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In August, the average length of the day in Greenwich is 13h and 46min.
On the first day of August, sunrise is at 5:50 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 7:29 pm EDT.

Sunshine

In August, the average sunshine in Greenwich is 10.3h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in August in Greenwich?

In Greenwich, in August, the average high-temperature is 80.6°F (27°C), and the average low-temperature is 68.7°F (20.4°C). in August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is evaluated at 84.2°F (29°C).

What is the least humid month in Greenwich?

August is the least humid month in Greenwich, Connecticut, with an average relative humidity of 71%.

What is the average humidity in August in Greenwich?

The average relative humidity in August is 71%.

How much does it rain in Greenwich in August?

In August, in Greenwich, the rain falls for 16.8 days. Throughout August, 3.5" (89mm) of precipitation is accumulated.

When it does not snow in Greenwich?

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

What is the month with the warmest ocean in Greenwich?

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater in Greenwich, Connecticut.

How warm is the water in August in Greenwich?

In Greenwich, Connecticut, in August, the average water temperature is 73°F (22.8°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73°F (22.8°C) water.

How many hours of daylight does Greenwich have in August?

The average day length in August in Greenwich, Connecticut, is 13h and 46min.

What time are sunrise and sunset in August in Greenwich?

On the first day of August in Greenwich, sunrise is at 5:50 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 7:29 pm EDT.

How many hours of sunshine does Greenwich have in August?

The average sunshine duration in August in Greenwich is 10.3h.

When is the highest UV index in Greenwich?

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

How high is the UV index in August in Greenwich?

In Greenwich, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Greenwich, CT

Average temperature in August - Greenwich, CT
  • Average high temperature in August: 80.6°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in August: 68.7°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in August
Greenwich, CT

Average pressure in August - Greenwich, CT
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in August
Greenwich, CT

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

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in August
Greenwich, CT

Average humidity in August - Greenwich, CT
  • Average humidity in August: 71%

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

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Average rainfall in August
Greenwich, CT

Average rainfall in August - Greenwich, CT
  • Average rainfall in August: 3.5"

The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.4").

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Average rainfall days in August
Greenwich, CT

Average rainfall days in August - Greenwich, CT
  • Average rainfall days in August: 16.8 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in August
Greenwich, CT

Average snowfall in August - Greenwich, CT
  • Average snowfall in August: 0"

The month with the highest snowfall is February (2.52").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in August
Greenwich, CT

Average snowfall days in August - Greenwich, CT
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in August
Greenwich, CT

Average sea temperature in August - Greenwich, CT
  • Average sea temperature in August: 73.1°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 August /
Average sunshine in August
Greenwich, CT

Average daylight in August / Average sunshine in August - Greenwich, CT
  • Average daylight in August: 13h and 46min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 17min).

  • Average sunshine in August: 10h and 18min

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

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Average sunshine days in August
Greenwich, CT

Average sunshine days in August - Greenwich, CT
  • Average sunshine days in August: 11.8 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (10.7 days).

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Average UV index in August
Greenwich, CT

Average UV index in August - Greenwich, CT
  • Average UV index in August: 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).

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Average cloud cover in August
Greenwich, CT

Average cloud cover in August - Greenwich, CT
  • Average cloud cover in August: 31

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 August
Greenwich, CT

Average visibility in August - Greenwich, CT
  • Average visibility in August: 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).

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