April weather forecast
Boston, MA

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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

The Boston weather in April signals a definitive arrival of spring. As the month proceeds, temperatures increase steadily, and weather patterns fluctuate less than in March. In contrast to colder months, the high and low temperatures rest between 55.2°F (12.9°C) and 40.5°F (4.7°C). With it comes the Bostonians walking their dogs in parks, joggers on pathways, and more people generally in outdoor spaces. The famous Boston Marathon is also a testament to the comfortable climatic conditions during this month.

Temperature

The shift from March to April in Boston brings an increase in the average high-temperature, moving from a frosty 43.5°F (6.4°C) to a cool 55.2°F (12.9°C). The low-temperature average for Boston during April stands at a cold 40.5°F (4.7°C).

Humidity

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

Rainfall

The 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 Boston, in April, snow falls for 1 days, with typically accumulated 0.79" (20mm) of snow. Throughout the year, there are 29.8 snowfall days, and 15.75" (400mm) of snow is accumulated.

Ocean temperature

In Boston, Massachusetts, the average seawater temperature in April is 43.2°F (6.2°C).
Note: Beware when you're in 43.2°F (6.2°C) waters; 55.4°F (13°C) is chilling and anything below 50°F (10°C) could cause breathing hindrance and a sudden cold shock, given your physical condition.

Daylight

The average length of the day in April is 13h and 24min.
On the first day of the month, sunrise is at 6:25 am and sunset at 7:10 pm. On the last day of April, in Boston, sunrise is at 5:39 am and sunset at 7:43 pm EDT.

Sunshine

In Boston, the average sunshine in April is 8h.

UV index

In Boston, the average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 3 during April translates into the following guidance:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
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Frequently asked questions

What is the temperature in April in Boston?

April temperatures vary between a high-temperature of 55.2°F (12.9°C) and a low-temperature of 40.5°F (4.7°C).

What is the least humid month in Boston?

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

What is the average humidity in April in Boston?

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

What is the wettest month in Boston?

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

How much does it rain in Boston in April?

In Boston, Massachusetts, during April, the rain falls for 14.8 days and regularly aggregates up to 2.91" (74mm) of precipitation.

How much does it snow in Boston in April?

In Boston, during April, snow falls for 1 days and regularly aggregates up to 0.79" (20mm) of snow.

What is the water temperature in April in Boston?

In April, the average ocean temperature is 43.2°F (6.2°C). 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.

How many hours of daylight does Boston have in April?

In Boston, the average day length in April is 13h and 24min.

When are sunrise and sunset in April in Boston?

On the first day of April, sunrise is at 6:25 am and sunset at 7:10 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 7:43 pm EDT.

How long on average sun shines in April in Boston?

In April, the average sunshine duration in Boston is 8h.

What is the UV index reading in April in Boston?

The average daily maximum UV index in April in Boston is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Boston, MA

Average temperature in April - Boston, MA
  • Average high temperature in April: 55.2°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 April: 40.5°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 April
Boston, MA

Average pressure in April - Boston, MA
  • Average pressure in April: 29.97"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 April
Boston, MA

Average wind speed in April - Boston, MA
  • Average wind speed in April: 8.6mph

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 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: 2.91"

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 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: 0.79"

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 April
Boston, MA

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

Average sea temperature in April - Boston, MA
  • Average sea temperature in April: 43.1°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 April /
Average sunshine in April
Boston, MA

Average daylight in April / Average sunshine in April - Boston, MA
  • Average daylight in April: 13h and 2min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in April: 8h and 0min

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 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

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 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: 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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Boston, Massachusetts, USA

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