August weather forecast
Cos Cob, CT

Weather in August

The last month of the summer, August, is another warm month in Cos Cob, Connecticut, with an average temperature varying between 68.7°F (20.4°C) and 80.6°F (27°C).

Temperature

In August, the average high-temperature is essentially 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

In August, the average heat index is calculated to be 84°F (28.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, metabolic differences, wind), and activity. 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 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

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

Rainfall

In Cos Cob, Connecticut, during 16.8 rainfall days, 3.5" (89mm) of precipitation is typically accumulated. In Cos Cob, during the entire year, the rain falls for 165.6 days and collects up to 37.64" (956mm) of precipitation.

Snowfall

May through October are months without snowfall.

Ocean temperature

August is the month with the warmest seawater in Cos Cob, with an average ocean temperature of 73°F (22.8°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 73°F (22.8°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

In August, the average length of the day is 13h and 46min.
On the first day of the month, sunrise is at 5:50 am and sunset at 8:10 pm. On the last day of August, in Cos Cob, Connecticut, sunrise is at 6:20 am and sunset at 7:29 pm EDT.

Sunshine

In August, the average sunshine in Cos Cob, Connecticut, is 10.3h.

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 hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in August in Cos Cob?

The average high-temperature, in August, in Cos Cob, Connecticut, is 80.6°F (27°C), while the average low-temperature is 68.7°F (20.4°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, is calculated to be 84°F (28.9°C).

What is the least humid month in Cos Cob?

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

What is the average humidity in August in Cos Cob?

In August, the average relative humidity in Cos Cob, Connecticut, is 71%.

How much does it rain in Cos Cob in August?

In Cos Cob, in August, it is raining for 16.8 days, with typically 3.5" (89mm) of accumulated precipitation.

When it does not snow in Cos Cob?

In Cos Cob, snow does not fall in May through October.

When is the ocean warmest in Cos Cob?

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

What is the water temperature in August in Cos Cob?

In Cos Cob, the average seawater temperature in August is 73°F (22.8°C). 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.

How many hours of daylight does Cos Cob have in August?

In August, the average day length in Cos Cob is 13h and 46min.

When are sunrise and sunset in August in Cos Cob?

In August, on the first day of the month, sunrise is at 5:50 am and sunset at 8:10 pm. On the last day of the month, in Cos Cob, sunrise is at 6:20 am and sunset at 7:29 pm EDT.

How long on average sun shines in August in Cos Cob?

In August, the average sunshine duration in Cos Cob is 10.3h.

What is the month with the highest UV index in Cos Cob?

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

What is the UV index intensity in August in Cos Cob?

The average daily maximum UV index in August in Cos Cob, Connecticut, 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 sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Cos Cob, CT

Average temperature in August - Cos Cob, 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
Cos Cob, CT

Average pressure in August - Cos Cob, 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
Cos Cob, CT

Average wind speed in August - Cos Cob, 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
Cos Cob, CT

Average humidity in August - Cos Cob, 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
Cos Cob, CT

Average rainfall in August - Cos Cob, 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
Cos Cob, CT

Average rainfall days in August - Cos Cob, 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
Cos Cob, CT

Average snowfall in August - Cos Cob, 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
Cos Cob, CT

Average snowfall days in August - Cos Cob, 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
Cos Cob, CT

Average sea temperature in August - Cos Cob, 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
Cos Cob, CT

Average daylight in August / Average sunshine in August - Cos Cob, 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: 10.3h

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

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Average sunshine days in August
Cos Cob, CT

Average sunshine days in August - Cos Cob, 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
Cos Cob, CT

Average UV index in August - Cos Cob, 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
Cos Cob, CT

Average cloud cover in August - Cos Cob, 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
Cos Cob, CT

Average visibility in August - Cos Cob, 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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