Boston
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

April 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
April in Boston, Massachusetts, is a fresh spring month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 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 fresh 55.2°F (12.9°C). In April, in Boston, the average low-temperature is 40.5°F (4.7°C).

Humidity

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

Rainfall

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

Snowfall

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

Ocean temperature

In April, the average ocean 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

The average sunshine in Boston is 8h.

UV index

In April, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in April in Boston?

The average high-temperature, in April, in Boston, Massachusetts, is 55.2°F (12.9°C), while the average low-temperature is 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?

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

How much does it rain in Boston in April?

In Boston, Massachusetts, in April, during 14.8 rainfall days, 2.91" (74mm) of precipitation is typically accumulated.

What is the rainiest month in Boston?

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

How many days does it snow in April in Boston?

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

How cold is the water in April in Boston?

In Boston, 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.

How many hours of daylight does Boston have in April?

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.

What is the UV index intensity in April in Boston?

In Boston, Massachusetts, the average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
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).

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%).

Average rainfall in April - Boston, MA
  • Average rainfall in April: 2.91"

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

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 lowest number of rainy days is January (7.9 days).

Average snowfall in April - Boston, MA
  • Average snowfall in April: 0.79"

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

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 lowest number of snowfall days are June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 9.1h).

  • Average sunshine in April: 8h

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

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).