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 and 40.5°F. 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

Boston's transition into April sees a rise in the average high-temperature, advancing from a chilly 43.5°F in March to a cool 55.2°F. During April, the temperature in Boston is averaged to a low of 40.5°F at night.

Humidity

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

Rainfall

The wettest months in Boston are March, April and December, with an average 2.91" of rainfall.

Snowfall

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

Ocean temperature

In Boston, the average seawater temperature in April is 43.2°F.
Note: You can swim in 43.2°F below 50°F with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 55.4°F without it is tough.

Daylight

The average length of the day in April is 13h and 24min.
On the first day of April, sunrise is at 6:26 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 7:42 pm EDT.

Sunshine

The average sunshine in April in Boston is 8h.

UV index

In Boston, Massachusetts, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 3 in April translates into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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FAQ

What are the temperatures in Boston in April?

The average high-temperature, in April, in Boston, is 55.2°F, while the average low-temperature is 40.5°F.

What is the least humid month in Boston?

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

What is the average humidity in April in Boston?

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

What is the wettest month in Boston?

The wettest months in Boston are March, April and December, with an average 2.91" of rainfall.

How many days does it rain in April in Boston?

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

How much does it snow in Boston in April?

In Boston, in April, during 1 snowfall days, 0.79" of snow is typically accumulated.

What is the ocean temperature in April in Boston?

In April, the average ocean temperature in Boston, Massachusetts, is 43.2°F. At temperatures below 50°F, 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 is not comfortable.

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 in Boston, Massachusetts, sunrise is at 6:26 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 7:42 pm EDT.

How long on average sun shines in April in Boston?

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

What is the UV index intensity in April in Boston?

In Boston, the average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAprilMJJASOND
Mar
April
May
Average high temperature
43.5°F
55.2°F
66.4°F
Average low temperature
30.9°F
40.5°F
50°F
Average pressure
30.03"Hg
29.97"Hg
30.01"Hg
Average wind speed
9.4mph
8.6mph
7.4mph
Average max. wind speed
10mph
9.3mph
7.9mph
Average wind speed gusts
14.2mph
12.9mph
11.1mph
Average humidity
73%
69%
72%
Average rainfall
2.91"
2.91"
1.81"
Average rainfall days
11.6
14.8
15.3
Average snowfall
3.86"
0.79"
0.04"
Average snowfall days
6.8
1
0.1
Average sea temperature
38.4°F
43.1°F
49.2°F
Average daylight
12h 0min
13h 2min
14h 4min
Average sunshine
5h 4min
8h 0min
8h 2min
Average sunshine days
14.8
13
14.2
Average UV index
2
3
5
Average cloud cover
51%
47%
46%
Average visibility
6mi
6mi
6mi

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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