July weather forecast
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts
A beautiful natural park with the George Washington Monument in Boston, Massachusetts

Weather in July

July, the same as June, is a moderately hot summer month in Boston, Massachusetts, with an average temperature fluctuating between 64.9°F (18.3°C) and 81.7°F (27.6°C).

Temperature

The warmest month is July, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C).

Heat index

In July, the average heat index is estimated at a tropical 86.5°F (30.3°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In July, the average relative humidity is 73%.

Rainfall

In Boston, in July, it is raining for 14.7 days, with typically 1.89" (48mm) of accumulated precipitation. In Boston, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

Snowfall

In Boston, snow does not fall in June through September.

Ocean temperature

In Boston, the average seawater temperature in July is 65.7°F (18.7°C).
Note: For swimming, a surface water temperature of 65.7°F (18.7°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).

Daylight

In Boston, the average length of the day in July is 14h and 55min.
On the first day of July in Boston, Massachusetts, sunrise is at 5:11 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:05 pm EDT.

Sunshine

In Boston, Massachusetts, the average sunshine in July is 10.1h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in Boston?

With an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C), July is the warmest month.

What is the temperature in July in Boston?

The average high-temperature, in July, in Boston, is 81.7°F (27.6°C), while the average low-temperature is 64.9°F (18.3°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in July is estimated at 86.5°F (30.3°C).

What is the average humidity in July in Boston?

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

How many days does it rain in July in Boston?

In Boston, Massachusetts, during July, the rain falls for 14.7 days and regularly aggregates up to 1.89" (48mm) of precipitation.

When it does not snow in Boston?

June through September are months without snowfall in Boston.

What is the ocean temperature in July in Boston?

In Boston, in July, the average water temperature is 65.7°F (18.7°C). For swimming, a surface water temperature of 65.7°F (18.7°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 Boston have in July?

The average day length in July in Boston is 14h and 55min.

When is the sunrise / sunset in July in Boston?

On the first day of July in Boston, Massachusetts, sunrise is at 5:11 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:05 pm EDT.

How long on average sun shines in July in Boston?

In July, the average sunshine duration in Boston is 10.1h.

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

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

What is the UV index intensity in July in Boston?

In July, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Boston, MA

Average temperature in July - Boston, MA
  • Average high temperature in July: 81.7°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in July: 64.9°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in July
Boston, MA

Average pressure in July - Boston, MA
  • Average pressure in July: 29.94"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
Boston, MA

Average wind speed in July - Boston, MA
  • Average wind speed in July: 6.3mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in July
Boston, MA

Average humidity in July - Boston, MA
  • Average humidity in July: 73%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in July
Boston, MA

Average rainfall in July - Boston, MA
  • Average rainfall in July: 1.89"

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

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Average rainfall days in July
Boston, MA

Average rainfall days in July - Boston, MA
  • Average rainfall days in July: 14.7 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in July
Boston, MA

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

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in July
Boston, MA

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

The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in July
Boston, MA

Average sea temperature in July - Boston, MA
  • Average sea temperature in July: 65.7°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

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

Average daylight in July / Average sunshine in July - Boston, MA
  • Average daylight in July: 14h and 55min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in July: 10h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in July
Boston, MA

Average sunshine days in July - Boston, MA
  • Average sunshine days in July: 15.3 days

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

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Average UV index in July
Boston, MA

Average UV index in July - Boston, MA
  • 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
Boston, MA

Average cloud cover in July - Boston, MA
  • Average cloud cover in July: 35

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in July
Boston, MA

Average visibility in July - Boston, 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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