August weather forecastOld Greenwich, CT
August
Weather in August
The weather in August is reminiscent of July, with high temperatures lingering in Old Greenwich. The sea temperature peaks at a comfortable 73.1°F (22.8°C), continuing to draw beachgoers. An undeniable benefit of summer is the long daylight hours, which maximize outdoor activities potential. Despite the peak summer heat, August weather tends to be a little sunnier than the previous months, reducing the overall afternoon heat sensation. While the Weather remains more or less consistent, a slight increase in winds from 6.6mph (10.6km/h) to 6.7mph (10.8km/h) can bring on occasional bouts of pleasantness.Temperature
The average high-temperature is a still warm 80.4°F (26.9°C) in August, hardly different from the 81.9°F (27.7°C) recorded in July. Old Greenwich's temperature tends to fall to an average low of 68.9°F (20.5°C) during the nights of August.Humidity
The least humid month is August, with an average relative humidity of 71%.Rainfall
In Old Greenwich, in August, 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
May through October are months without snowfall.Ocean temperature
The month with the warmest seawater is August, with an average ocean temperature of 73°F (22.8°C).Note: Individual cold sensitivities, influenced by sunshine, wind, and the ambient temperature, play a role in finding a swim in 73°F (22.8°C) water pleasant. (Olympic swimming events mandate water temperatures from 77°F (25°C) to 82.4°F (28°C).)
Daylight
In Old Greenwich, the average length of the day in August 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, sunrise is at 6:20 am and sunset at 7:28 pm EDT.
Sunshine
In August, the average sunshine is 10.2h.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 6 in August interprets into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be attentive! The UV exposure is heightened with reflections from sand and water.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in August
Old Greenwich, CT
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
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).
Average humidity in August
Old Greenwich, CT
- Average humidity in August: 71%
The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).
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").
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).
Average snowfall in August
Old Greenwich, CT
- Average snowfall in August: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
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).
Average daylight in August /
Average sunshine in August
Old Greenwich, CT
- Average daylight in August: 13h and 48min
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 12min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
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).
Average UV index in August
Old 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).
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).
Average visibility in August
Old 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).
