July weather forecast
Old Greenwich, CT

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Weather in July

July, the height of summer in Old Greenwich, comes with some of the highest temperatures approaching 81.9°F (27.7°C)-and high humidity levels from 73% to 75%. Despite the heat, the city comes alive with residents flocking to beaches, thanks to the sea temperature reaching a comfortable 70.9°F (21.6°C). In the evening, the setting sun gives way to cooler winds that offer much-needed relief. Ample sunshine combined with slightly higher pressure levels makes it a popular month for outdoor barbecuing, swimming, and sightseeing. It is indeed a month of vibrancy and high spirits in Old Greenwich.

Temperature

July is the month when Old Greenwich experiences its warmest temperatures, averaging a high of 81.9°F (27.7°C) and a low of 69.3°F (20.7°C).

Heat index

In July, the heat index is evaluated at a hot 86°F (30°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.

Humidity

In July, the average relative humidity is 73%.

Rainfall

The month with the most rainfall in Old Greenwich, Connecticut, is July, when the rain falls for 17.8 days and typically aggregates up to 4.13" (105mm) of precipitation.

Snowfall

In Old Greenwich, snow does not fall in May through October.

Ocean temperature

In July, the average ocean temperature is 70.9°F (21.6°C).
Note: Swimming in 70.9°F (21.6°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).

Daylight

In July, the average length of the day is 14h and 47min.
On the first day of July, sunrise is at 5:26 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:11 pm EDT.

Sunshine

With an average of 10.5h of sunshine, July 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 reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In July, the maximum UV index of 6 suggests this advice:
Shun overexposure. Protection from sun ravages is indispensable. 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be on guard! The reflective nature of sand and water boosts UV exposure.
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Frequently asked questions

What time of the year is the hottest in Old Greenwich?

Old Greenwich, Connecticut, registers the average highest temperatures during July, with peaks of 81.9°F (27.7°C) and lows of 69.3°F (20.7°C).

What is the usual temperature for Old Greenwich in July?

In Old Greenwich, 81.9°F (27.7°C) is the average high-temperature and 69.3°F (20.7°C) is the average low-temperature during July. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is evaluated at 86°F (30°C).

What is the average humidity in July in Old Greenwich?

In July, the average relative humidity in Old Greenwich is 73%.

What is the rainiest month in Old Greenwich?

The month with the most rainfall in Old Greenwich is July, when the rain falls for 17.8 days and typically aggregates up to 4.13" (105mm) of precipitation.

How much does it rain in Old Greenwich in July?

In Old Greenwich, in July, during 17.8 rainfall days, 4.13" (105mm) of precipitation is typically accumulated.

When it does not snow in Old Greenwich?

May through October are months without snowfall in Old Greenwich.

How cold is the water in July in Old Greenwich?

In Old Greenwich, in July, the average water temperature is 70.9°F (21.6°C). Swimming in 70.9°F (21.6°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Old Greenwich have in July?

In July, the average day length in Old Greenwich is 14h and 47min.

When is the sunrise / sunset in July in Old Greenwich?

In July, on the first day of the month, sunrise is at 5:26 am and sunset at 8:30 pm. On the last day of the month, in Old Greenwich, sunrise is at 5:49 am and sunset at 8:11 pm EDT.

What month has the most sunshine in Old Greenwich?

With an average of 10.5h of sunshine, July has the most sunshine of the year in Old Greenwich, Connecticut.

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

In July, the average sunshine duration in Old Greenwich is 10.5h.

When is the highest UV index in Old Greenwich?

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

How high is the UV index in July in Old Greenwich?

In Old Greenwich, Connecticut, the average daily maximum UV index in July is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
74.7°F 23.7°C
81.9°F 27.7°C
80.4°F 26.9°C
Average low temperature
61.7°F 16.5°C
69.3°F 20.7°C
68.9°F 20.5°C
Average pressure
29.93" 760mmHg
29.96" 761mmHg
29.98" 761mmHg
Average wind speed
7.1mph 11.4km/h
6.6mph 10.6km/h
6.7mph 10.8km/h
Average max. wind speed
7.7mph 12.4km/h
7.3mph 11.7km/h
7.3mph 11.7km/h
Average wind speed gusts
11.6mph 18.7km/h
10.6mph 17.1km/h
10.3mph 16.6km/h
Average humidity
75%
73%
71%
Average rainfall
3.27" 83mm
4.13" 105mm
3.46" 88mm
Average rainfall days
16.9
17.8
16.3
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
63°F 17.2°C
70.9°F 21.6°C
73.1°F 22.8°C
Average daylight
15h 1min
14h 5min
13h 5min
Average sunshine
9h 3min
10h 3min
10h 1min
Average sunshine days
11.1
11.3
12
Average UV index
6
6
6
Average cloud cover
37%
32%
31%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in July
Old Greenwich, CT

Average temperature in July - Old Greenwich, CT
  • Average high temperature in July: 81.9°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 July: 69.3°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 July
Old Greenwich, CT

Average pressure in July - Old Greenwich, CT
  • Average pressure in July: 29.96"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).

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Average wind speed in July
Old Greenwich, CT

Average wind speed in July - Old Greenwich, CT
  • Average wind speed in July: 6.6mph

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 July
Old Greenwich, CT

Average humidity in July - Old Greenwich, CT
  • Average humidity in July: 73%

The 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 July
Old Greenwich, CT

Average rainfall in July - Old Greenwich, CT
  • Average rainfall in July: 4.13"

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 July
Old Greenwich, CT

Average rainfall days in July - Old Greenwich, CT
  • Average rainfall days in July: 17.8 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 July
Old Greenwich, CT

Average snowfall in July - Old Greenwich, CT
  • Average snowfall in July: 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").

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Average snowfall days in July
Old Greenwich, CT

Average snowfall days in July - Old Greenwich, CT
  • Average snowfall days in July: 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).

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Average sea temperature in July
Old Greenwich, CT

Average sea temperature in July - Old Greenwich, CT
  • Average sea temperature in July: 70.9°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 July /
Average sunshine in July
Old Greenwich, CT

Average daylight in July / Average sunshine in July - Old Greenwich, CT
  • Average daylight in July: 14h 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 July: 10h and 3min

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).

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Average sunshine days in July
Old Greenwich, CT

Average sunshine days in July - Old Greenwich, CT
  • Average sunshine days in July: 11.3 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 July
Old Greenwich, CT

Average UV index in July - Old Greenwich, 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
Old Greenwich, CT

Average cloud cover in July - Old Greenwich, CT
  • Average cloud cover in July: 32

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 July
Old Greenwich, CT

Average visibility in July - Old Greenwich, 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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Old Greenwich, Connecticut, USA

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