July weather forecast
Groton, CT

Weather in July

July in Groton, Connecticut, is a warm summer month, with an average temperature fluctuating between 66.7°F (19.3°C) and 78.6°F (25.9°C).

Temperature

With an average high-temperature of 78.6°F (25.9°C) and an average low-temperature of 66.7°F (19.3°C), July is the warmest month.

Humidity

In Groton, the average relative humidity in July is 79%.

Rainfall

In Groton, in July, during 15.8 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Groton, during the entire year, the rain falls for 159.8 days and collects up to 33.07" (840mm) of precipitation.

Snowfall

May through October are months without snowfall.

Ocean temperature

In Groton, the average water temperature is 69.4°F (20.8°C).
Note: For most, swimming in 69.4°F (20.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In July, the average length of the day is 14h and 49min.
On the first day of the month, sunrise is at 5:18 am and sunset at 8:25 pm. On the last day of July, in Groton, sunrise is at 5:42 am and sunset at 8:06 pm EDT.

Sunshine

In Groton, the average sunshine in July is 10.5h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index in Groton, Connecticut. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 in July interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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.
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FAQ

What is the warmest month in Groton?

July is the warmest month in Groton, Connecticut, with an average high-temperature of 78.6°F (25.9°C) and an average low-temperature of 66.7°F (19.3°C).

What is the average humidity in July in Groton?

The average relative humidity in July in Groton, Connecticut, is 79%.

How many days does it rain in July in Groton?

In Groton, in July, during 15.8 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

When it does not snow in Groton?

May through October are months without snowfall in Groton, Connecticut.

What is the ocean temperature in July in Groton?

In Groton, Connecticut, the average seawater temperature in July is 69.4°F (20.8°C). For most, swimming in 69.4°F (20.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Groton have in July?

In Groton, the average day length in July is 14h and 49min.

What time are sunrise and sunset in July in Groton?

On the first day of July in Groton, Connecticut, sunrise is at 5:18 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 8:06 pm EDT.

How many hours of sunshine does Groton have in July?

In Groton, Connecticut, the average sunshine duration in July is 10.5h.

When is 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 intensity in July in Groton?

In July, the average daily maximum UV index in Groton, Connecticut, is 6. A UV Index reading of 6 to 7 represents a high health risk 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 July
Groton, CT

Average temperature in July - Groton, CT
  • Average high temperature in July: 78.6°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 July: 66.7°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 July
Groton, CT

Average pressure in July - Groton, CT
  • Average pressure in July: 29.95"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 July
Groton, CT

Average wind speed in July - Groton, CT
  • Average wind speed in July: 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 July
Groton, CT

Average humidity in July - Groton, CT
  • Average humidity in July: 79%

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 July
Groton, CT

Average rainfall in July - Groton, CT
  • Average rainfall in July: 2.44"

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 July
Groton, CT

Average rainfall days in July - Groton, CT
  • Average rainfall days in July: 15.8 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 July
Groton, CT

Average snowfall in July - Groton, CT
  • Average snowfall in July: 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 July
Groton, CT

Average snowfall days in July - Groton, CT
  • Average snowfall days in July: 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 July
Groton, CT

Average sea temperature in July - Groton, CT
  • Average sea temperature in July: 69.5°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 July /
Average sunshine in July
Groton, CT

Average daylight in July / Average sunshine in July - Groton, CT
  • Average daylight in July: 14h and 49min

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 July: 10h and 30min

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 July
Groton, CT

Average sunshine days in July - Groton, CT
  • Average sunshine days in July: 13.4 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 July
Groton, CT

Average UV index in July - Groton, CT
  • Average UV index in July: 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 July
Groton, CT

Average cloud cover in July - Groton, CT
  • Average cloud cover in July: 31

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 July
Groton, CT

Average visibility in July - Groton, CT
  • Average visibility in July: 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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