July weather forecast
Hyannis, MA

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Weather in July

As the heart of the summer, July boasts the highest temperatures of the year in Hyannis. The sea temperature reaches its annual peak of 65.8°F (18.8°C), perfectly suited for beach-related activities. An extended duration of sunshine hours ensures a high UV index. However, this increase is counterbalanced by a drop in cloud cover percentage, keeping weather patterns predictable. The rainfall tendencies decrease in July, exhibiting some of the best weather conditions of the year.

Temperature

Hyannis's weather in July presents a minor rise in the average high-temperature, moving from a comfortable 63.9°F (17.7°C) in June to a pleasant 72°F (22.2°C). Hyannis reports an average low temperature of 67.6°F (19.8°C) in July, a minor decrease from the day's highs.

Humidity

With an average relative humidity of 84%, July is the most humid month.

Rainfall

In Hyannis, during July, the rain falls for 15.1 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Hyannis, during the entire year, the rain falls for 157.2 days and collects up to 31.77" (807mm) of precipitation.

Snowfall

May through November are months without snowfall in Hyannis.

Ocean temperature

In Hyannis, Massachusetts, in July, the average water temperature is 65.8°F (18.8°C).
Note: For the majority, swimming in water with a temperature of 65.8°F (18.8°C) is not enjoyable. The difficulty in managing breathing rises as the 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 50min.
On the first day of the month, sunrise is at 5:10 am and sunset at 8:19 pm. On the last day of July, in Hyannis, sunrise is at 5:35 am and sunset at 7:59 pm EDT.

Sunshine

In July, the average sunshine in Hyannis is 10.6h.

UV index

July and 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 hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In July, the maximum UV index of 6 suggests these recommendations:
Deter overexposure. Protecting against the sun's effects is essential. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
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Frequently asked questions

What are the temperatures in Hyannis in July?

The high-temperature, in July, in Hyannis, is 72°F (22.2°C), while the low-temperature averages to 67.6°F (19.8°C).

What is the most humid month in Hyannis?

With an average relative humidity of 84%, July is the most humid month in Hyannis, Massachusetts.

What is the average humidity in July in Hyannis?

In Hyannis, the average relative humidity in July is 84%.

How many days does it rain in July in Hyannis?

In Hyannis, Massachusetts, in July, it is raining for 15.1 days, with typically 2.05" (52mm) of accumulated precipitation.

When it does not snow in Hyannis?

May through November are months without snowfall in Hyannis.

What is the ocean temperature in July in Hyannis?

In Hyannis, Massachusetts, in July, the average water temperature is 65.8°F (18.8°C). For swimming, a surface water temperature of 65.8°F (18.8°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Hyannis have in July?

In July, the average day length is 14h and 50min.

When is the sunrise / sunset in July in Hyannis?

In July, on the first day of the month, sunrise is at 5:10 am and sunset at 8:19 pm. On the last day of the month, in Hyannis, sunrise is at 5:35 am and sunset at 7:59 pm EDT.

How many hours of sunshine does Hyannis have in July?

In July, the average sunshine duration is 10.6h.

What is the month with the highest UV index in Hyannis?

The months with the highest UV index in Hyannis, Massachusetts, are July and August, with an average maximum UV index of 6.

How high is the UV index in July in Hyannis?

The average daily maximum UV index in July is 6. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Hyannis, MA

Average temperature in July - Hyannis, MA
  • Average high temperature in July: 72°F

The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in July: 67.6°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

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Average pressure in July
Hyannis, MA

Average pressure in July - Hyannis, MA
  • Average pressure in July: 29.96"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in July
Hyannis, MA

Average wind speed in July - Hyannis, MA
  • Average wind speed in July: 10.7mph

The windiest month (with the highest average wind speed) is January (16.5mph).
The calmest month (with the lowest average wind speed) is August (10.6mph).

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Average humidity in July
Hyannis, MA

Average humidity in July - Hyannis, MA
  • Average humidity in July: 84%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in July
Hyannis, MA

Average rainfall in July - Hyannis, MA
  • Average rainfall in July: 2.05"

The wettest month (with the highest rainfall) is October (3.7").
The driest month (with the least rainfall) is August (1.73").

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Average rainfall days in July
Hyannis, MA

Average rainfall days in July - Hyannis, MA
  • Average rainfall days in July: 15.1 days

The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (10.3 days).

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Average snowfall in July
Hyannis, MA

Average snowfall in July - Hyannis, MA
  • Average snowfall in July: 0"

The month with the highest snowfall is March (1.93").
The months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days in July
Hyannis, MA

Average snowfall days in July - Hyannis, MA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (7.1 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
Hyannis, MA

Average sea temperature in July - Hyannis, MA
  • Average sea temperature in July: 65.8°F

The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).

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Average daylight in July /
Average sunshine in July
Hyannis, MA

Average daylight in July / Average sunshine in July - Hyannis, MA
  • 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 12min).

  • Average sunshine in July: 10h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).

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Average sunshine days in July
Hyannis, MA

Average sunshine days in July - Hyannis, MA
  • Average sunshine days in July: 14.9 days

The month with the most sunshine days is August (17.7 days).
The month with the least sunshine days is February (11.4 days).

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Average UV index in July
Hyannis, MA

Average UV index in July - Hyannis, MA
  • Average UV index in July: 6

The months with the highest UV index are 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
Hyannis, MA

Average cloud cover in July - Hyannis, MA
  • Average cloud cover in July: 29

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in July
Hyannis, MA

Average visibility in July - Hyannis, MA
  • 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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Hyannis, Massachusetts, USA

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