July weather forecast and climate
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
July, like June, in Boston, Massachusetts, is a moderately hot summer month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 64.9°F (18.3°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 appraised at a hot 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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in July is 73%.

Rainfall

In Boston, during July, the rain falls for 14.7 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, there are 141.4 rainfall days, and 27.2" (691mm) of precipitation is accumulated.

Snowfall

In Boston snow does not fall in June through September.

Ocean temperature

In Boston, the average water temperature 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

The average length of the day in Boston is 14.9h.

Sunshine

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

UV index

Months with the highest UV index in Boston 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 unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.

What is the warmest month in Boston?

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

What is the temperature in July in Boston?

The average high-temperature, in July, is 81.7°F (27.6°C), while the average low-temperature is 64.9°F (18.3°C). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines both air temperature and relative humidity, is calculated to 86.5°F (30.3°C).

What is the average humidity in July in Boston?

In Boston, Massachusetts, 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?

In Boston snow does not fall in June through September.

What is the ocean temperature in July in Boston?

In July, the average ocean 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?

In July, the average length of the day in Boston is 14.9h.

How many hours of sunshine does Boston have in July?

The average sunshine in July in Boston is 10.1h.

When is the highest UV index in Boston?

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

How high is the UV index in July in Boston?

In July, the average daily maximum UV index in Boston is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.
Average temperature in July - Boston, MA
  • Average high temperature in July: 27.6°C

The warmest month (with the highest average high temperature) is July (27.6°C).
The month with the lowest average high temperature is January (1.2°C).

  • Average low temperature in July: 18.3°C

The month with the highest average low temperature is July (18.3°C).
The coldest month (with the lowest average low temperature) is January (-5.2°C).

Average pressure in July - Boston, MA
  • Average pressure in July: 1014mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1013.4mbar).

Average wind speed in July - Boston, MA
  • Average wind speed in July: 10.1km/h

The windiest month (with the highest average wind speed) is January (15.9km/h).
The calmest month (with the lowest average wind speed) is August (9.9km/h).

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%).

Average rainfall in July - Boston, MA
  • Average rainfall in July: 48mm

The wettest months (with the highest rainfall) are March, April and December (74mm).
The driest month (with the least rainfall) is September (32mm).

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).

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

The month with the highest snowfall is February (120mm).
Months with the least snowfall are June, July, August and September (0mm).

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

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

Average sea temperature in July - Boston, MA
  • Average sea temperature in July: 18.7°C

The best month for swimming (with the highest average sea temperature) is August (20°C).
The coldest month (with the lowest average sea temperature) is February (3.4°C).

Average daylight in July / Average sunshine in July - Boston, MA
  • Average daylight in July: 14.9h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in July: 10.1h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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).

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

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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).

Average visibility in July - Boston, MA
  • Average visibility in July: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).