April weather forecast and climate
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 April

April in Boston, Massachusetts, is a cool spring month, with average temperature fluctuating between 55.2°F (12.9°C) and 40.5°F (4.7°C).

Temperature

In April, the average high-temperature increases, from a frosty 43.5°F (6.4°C) in March, to a cool 55.2°F (12.9°C). In Boston, the average low-temperature is 40.5°F (4.7°C).

Humidity

With an average relative humidity of 69%, April is the least humid month.

Rainfall

Months with the most rainfall in Boston are March, April and December, with an average 2.91" (74mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In April, it is snowing for 1 days. Throughout April, 0.79" (20mm) of snow is accumulated. In Boston, during the entire year, snow falls for 29.8 days, and aggregates up to 15.75" (400mm) of snow.

Ocean temperature

In Boston, the average seawater temperature is 43.2°F (6.2°C).
Note: Swimming in 43.2°F (6.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in April is 13.4h.

Sunshine

In Boston, the average sunshine is 8h.

UV index

The average daily maximum UV index in Boston is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In April, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the least humid month in Boston?

With an average relative humidity of 69%, April is the least humid month in Boston.

What is the average humidity in April in Boston?

The average relative humidity in April in Boston, Massachusetts, is 69%.

What is the rainiest month in Boston?

The wettest months in Boston, Massachusetts, are March, April and December, with an average 2.91" (74mm) of rainfall.

How many days does it rain in April in Boston?

In April, in Boston, the rain falls for 14.8 days. Throughout April, 2.91" (74mm) of precipitation is accumulated.

How much does it snow in Boston in April?

In April, in Boston, it is snowing for 1 days. Throughout April, 0.79" (20mm) of snow is accumulated.

What is the ocean temperature in April in Boston?

In Boston, Massachusetts, in April, the average water temperature is 43.2°F (6.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in April in Boston?

In Boston, Massachusetts, the average length of the day in April is 13.4h.

How many hours of sunshine does Boston have in April?

The average sunshine in April in Boston is 8h.

How high is the UV index in April in Boston?

In April, the average daily maximum UV index in Boston is 3. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in April
Boston, MA

Average temperature in April - Boston, MA
  • Average high temperature in April: 12.9°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 April: 4.7°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).

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Average pressure in April
Boston, MA

Average pressure in April - Boston, MA
  • Average pressure in April: 1014.9mbar

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

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Average wind speed in April
Boston, MA

Average wind speed in April - Boston, MA
  • Average wind speed in April: 13.9km/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).

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Average humidity in April
Boston, MA

Average humidity in April - Boston, MA
  • Average humidity in April: 69%

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 April
Boston, MA

Average rainfall in April - Boston, MA
  • Average rainfall in April: 74mm

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

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Average rainfall days in April
Boston, MA

Average rainfall days in April - Boston, MA
  • Average rainfall days in April: 14.8 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 April
Boston, MA

Average snowfall in April - Boston, MA
  • Average snowfall in April: 20mm

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

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Average snowfall days in April
Boston, MA

Average snowfall days in April - Boston, MA
  • Average snowfall days in April: 1 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).

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Average sea temperature in April
Boston, MA

Average sea temperature in April - Boston, MA
  • Average sea temperature in April: 6.2°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).

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

Average daylight in April / Average sunshine in April - Boston, MA
  • Average daylight in April: 13.4h

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 April: 8h

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

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Average sunshine days in April
Boston, MA

Average sunshine days in April - Boston, MA
  • Average sunshine days in April: 13 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 April
Boston, MA

Average UV index in April - Boston, MA
  • Average UV index in April: 3

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).

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Average cloud cover in April
Boston, MA

Average cloud cover in April - Boston, MA
  • Average cloud cover in April: 47

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 April
Boston, MA

Average visibility in April - Boston, MA
  • Average visibility in April: 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).

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