August weather forecast
Cos Cob, CT

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Weather in August

August in Cos Cob continues the summer vibe, even though the weather is slightly cooler than July. Residents and visitors can still enjoy the beach and picnics in the park. In August, the high temperature is approximately 80.6°F (27°C), and the low is about 68.7°F (20.4°C), indicating a slight drop compared to July. The days, while still fairly long, begin to shorten gradually. August gives everyone a chance to enjoy the last bit of summertime fun before the transition to cooler temperatures.

Temperature

With the arrival of August, Cos Cob's average high-temperature registers at a still moderately hot 80.6°F (27°C), indicating a subtle variation from the previous month. The month of August records an average low-temperature of 68.7°F (20.4°C).

Heat index

For August, the heat index is appraised at 84.2°F (29°C). Persisting in activity during long-term exposure might induce weariness, with subsequent heat cramps.
Know that the heat index computations account for shaded terrains and slight winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', gives an indication of how one might feel in terms of heat after considering humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

With an average relative humidity of 71%, August is the least humid month.

Rainfall

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

Snowfall

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

Ocean temperature

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater.
Note: The allure of a swim in 73°F (22.8°C) waters can be influenced by your feelings towards the cold, today's sunshine, the wind's touch, and the ambient warmth. To put it in perspective, Olympic standards demand water temperatures of 77°F (25°C) to 82.4°F (28°C).

Daylight

In August, the average length of the day in Cos Cob is 13h and 46min.
On the first day of the month, sunrise is at 5:51 am and sunset at 8:10 pm. On the last day of August, in Cos Cob, sunrise is at 6:20 am and sunset at 7:28 pm EDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index in Cos Cob. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: During August, 6 as the daily maximum UV index converts into the following advice:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Watch out! Reflections from sand and water can surge UV radiation exposure.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average August temperature in Cos Cob?

The average high-temperature and low-temperature in Cos Cob during August are 80.6°F (27°C) and 68.7°F (20.4°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is appraised at 84.2°F (29°C).

What is the least humid month in Cos Cob?

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

What is the average humidity in August in Cos Cob?

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

How many days does it rain in August in Cos Cob?

In Cos Cob, Connecticut, during August, the rain falls for 16.8 days and regularly aggregates up to 3.5" (89mm) of precipitation.

When it does not snow in Cos Cob?

May through October are months without snowfall in Cos Cob.

When is the ocean warmest in Cos Cob?

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

What is the ocean temperature in August in Cos Cob?

In Cos Cob, in August, the average water temperature 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.

What is the average length of the day in August in Cos Cob?

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

What time are sunrise and sunset in August in Cos Cob?

On the first day of August in Cos Cob, sunrise is at 5:51 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 7:28 pm EDT.

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

The average sunshine duration in August in Cos Cob is 10.3h.

When is 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.

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

In August, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability 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 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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 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 August: 10h and 2min

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).

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).

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).

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).

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).

Cos Cob, Connecticut, USA

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