August weather forecast and climate
Old Greenwich, CT

Weather in August

The last month of the summer, August, is another warm month in Old Greenwich, Connecticut, with temperature in the range of an average low of 68.9°F (20.5°C) and an average high of 80.4°F (26.9°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 80.4°F (26.9°C). In Old Greenwich, in August, the average low-temperature is 68.9°F (20.5°C).

Humidity

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

Rainfall

In Old Greenwich, it is raining for 16.3 days, with typically 3.46" (88mm) of accumulated precipitation. In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.

Snowfall

In Old Greenwich 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 in Old Greenwich.
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

The average length of the day is 13.8h.

Sunshine

The average sunshine is 10.2h.

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 risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the least humid month in Old Greenwich?

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

What is the average humidity in August in Old Greenwich?

In Old Greenwich, Connecticut, the average relative humidity in August is 71%.

How much does it rain in Old Greenwich in August?

In August, the rain falls for 16.3 days. Throughout August, 3.46" (88mm) of precipitation is accumulated.

When it does not snow in Old Greenwich?

May through October are months without snowfall in Old Greenwich.

What is the month with the warmest ocean in Old Greenwich?

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

What is the ocean temperature in August in Old Greenwich?

In Old Greenwich, the average seawater temperature in August is 73°F (22.8°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 73°F (22.8°C).

What is the average length of the day in August in Old Greenwich?

The average length of the day in August in Old Greenwich, Connecticut, is 13.8h.

How long on average sun shines in August in Old Greenwich?

In Old Greenwich, Connecticut, the average sunshine in August is 10.2h.

When is the highest UV index in Old Greenwich?

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

What is the UV index reading in August in Old Greenwich?

In August, the average daily maximum UV index in Old Greenwich is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in August
Old Greenwich, CT

Average temperature in August - Old Greenwich, CT
  • Average high temperature in August: 80.4°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 August: 68.9°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 August
Old Greenwich, CT

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

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 August
Old Greenwich, CT

Average wind speed in August - Old Greenwich, CT
  • Average wind speed in August: 6.7mph

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 August
Old Greenwich, CT

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

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 August
Old Greenwich, CT

Average rainfall in August - Old Greenwich, CT
  • Average rainfall in August: 3.46"

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 August
Old Greenwich, CT

Average rainfall days in August - Old Greenwich, CT
  • Average rainfall days in August: 16.3 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 August
Old Greenwich, CT

Average snowfall in August - Old Greenwich, CT
  • Average snowfall in August: 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 August
Old Greenwich, CT

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

Average sea temperature in August - Old 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
Old Greenwich, CT

Average daylight in August / Average sunshine in August - Old Greenwich, CT
  • Average daylight in August: 13.8h

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 August: 10.2h

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 August
Old Greenwich, CT

Average sunshine days in August - Old Greenwich, CT
  • Average sunshine days in August: 12 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 August
Old Greenwich, CT

Average UV index in August - Old Greenwich, CT
  • Average UV index in August: 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 August
Old Greenwich, CT

Average cloud cover in August - Old 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
Old Greenwich, CT

Average visibility in August - Old Greenwich, CT
  • Average visibility in August: 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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