August weather forecast
Groton, CT

Weather in August

The last month of the summer, August, is another warm month in Groton, Connecticut, with an average temperature fluctuating between 77.7°F (25.4°C) and 66.2°F (19°C).

Temperature

In Groton, the average high-temperature in August is relatively the same as in July - a still warm 77.7°F (25.4°C). In Groton, Connecticut, the average low-temperature is 66.2°F (19°C).

Humidity

The average relative humidity in August in Groton is 78%.

Rainfall

In Groton, Connecticut, during August, the rain falls for 13.8 days and regularly aggregates up to 2.36" (60mm) of precipitation. In Groton, during the entire year, the rain falls for 159.8 days and collects up to 33.07" (840mm) of precipitation.

Snowfall

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

Ocean temperature

The month with the warmest seawater in Groton is August, with an average ocean temperature of 72.1°F (22.3°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 72.1°F (22.3°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

The average length of the day in August in Groton is 13h and 47min.
On the first day of the month, sunrise is at 5:43 am and sunset at 8:05 pm. On the last day of August, sunrise is at 6:13 am and sunset at 7:23 pm EDT.

Sunshine

With an average of 10.6h of sunshine, August has the most sunshine of the year.

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 hazard from exposure to the Sun's UV radiation for ordinary 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the average humidity in August in Groton?

In Groton, the average relative humidity in August is 78%.

How much does it rain in Groton in August?

In Groton, Connecticut, during August, the rain falls for 13.8 days and regularly aggregates up to 2.36" (60mm) of precipitation.

When it does not snow in Groton?

May through October are months without snowfall.

When is the ocean warmest in Groton?

With an average ocean temperature of 72.1°F (22.3°C), August is the month with the warmest seawater in Groton.

What is the ocean temperature in August in Groton?

In Groton, in August, the average water temperature is 72.1°F (22.3°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.1°F (22.3°C) water.

How many hours of daylight does Groton have in August?

The average day length in August is 13h and 47min.

When are sunrise and sunset in August in Groton?

In August, on the first day of the month, sunrise is at 5:43 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 7:23 pm EDT.

What month has the most sunshine in Groton?

The month with the most sunshine in Groton is August, with an average of 10.6h of sunshine.

How long on average sun shines in August in Groton?

The average sunshine duration in August is 10.6h.

What are the months with the highest UV index in Groton?

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

What is the UV index reading in August in Groton?

The average daily maximum UV index in August in Groton, Connecticut, is 6. A UV Index of 6 to 7 symbolizes 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
Groton, CT

Average temperature in August - Groton, CT
  • Average high temperature in August: 77.7°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in August: 66.2°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in August
Groton, CT

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

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in August
Groton, CT

Average wind speed in August - Groton, CT
  • Average wind speed in August: 7.8mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in August
Groton, CT

Average humidity in August - Groton, CT
  • Average humidity in August: 78%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in August
Groton, CT

Average rainfall in August - Groton, CT
  • Average rainfall in August: 2.36"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.65").

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Average rainfall days in August
Groton, CT

Average rainfall days in August - Groton, CT
  • Average rainfall days in August: 13.8 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in August
Groton, CT

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

The month with the highest snowfall is March (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in August
Groton, CT

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

The month with the highest number of snowfall days is February (6.8 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
Groton, CT

Average sea temperature in August - Groton, CT
  • Average sea temperature in August: 72.1°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in August /
Average sunshine in August
Groton, CT

Average daylight in August / Average sunshine in August - Groton, CT
  • Average daylight in August: 13h and 47min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in August: 10h and 36min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

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Average sunshine days in August
Groton, CT

Average sunshine days in August - Groton, CT
  • Average sunshine days in August: 14.6 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (12.5 days).

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Average UV index in August
Groton, CT

Average UV index in August - Groton, 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
Groton, CT

Average cloud cover in August - Groton, CT
  • Average cloud cover in August: 29

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in August
Groton, CT

Average visibility in August - Groton, 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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