Portland
Maine, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Portland, ME

Dusk view of the lit skyscrapers of the Portland city in Maine
Dusk view of the lit skyscrapers of the Portland city in Maine
April is a cool spring month in Portland, Maine, with average temperature ranging between min 34.7°F (1.5°C) and max 53.2°F (11.8°C).

Temperature

In April, the average high-temperature rises, from a wintry 42.1°F (5.6°C) in March, to a fresh 53.2°F (11.8°C). In April, the average low-temperature is 34.7°F (1.5°C).

Humidity

In Portland, the average relative humidity is 66.8%.

Rainfall

In Portland, during April, the rain falls for 11.2 days and regularly aggregates up to 4.3" (109.7mm) of precipitation. In Portland, during the entire year, the rain falls for 130.9 days and collects up to 47.3" (1200.3mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December.

Ocean temperature

In Portland, Maine, the average water temperature is 41.5°F (5.3°C).
Note: 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.

Daylight

In April, the average length of the day is 13.5h.

Sunshine

In April, the average sunshine is 7.1h.

UV index

The average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
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. 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 Portland?

The average high-temperature, in April, in Portland, Maine, is 53.2°F (11.8°C), while the average low-temperature is 34.7°F (1.5°C).

What is the average humidity in April in Portland?

The average relative humidity in April in Portland, Maine, is 66.8%.

How much does it rain in Portland in April?

In April, in Portland, the rain falls for 11.2 days. Throughout April, 4.3" (109.7mm) of precipitation is accumulated.

What is the last month it snows in Portland?

April is the last month it regularly snows. During 1 snowfall days, in April, Portland aggregates 2.8" (71.1mm) of snow.

What is the ocean temperature in April in Portland?

In April, the average ocean temperature in Portland is 41.5°F (5.3°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 Portland?

The average length of the day in April in Portland is 13.5h.

How many hours of sunshine does Portland have in April?

In April, the average sunshine in Portland is 7.1h.

How high is the UV index in April in Portland?

In Portland, the average daily maximum UV index in April is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in April - Portland, ME
  • Average high temperature in April: 53.3°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (31.2°F).

  • Average low temperature in April: 34.7°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (13.4°F).

Average humidity in April - Portland, ME
  • Average humidity in April: 66.8%

The month with the highest relative humidity is September (76.7%).
The month with the lowest relative humidity is February (65.2%).

Average rainfall in April - Portland, ME
  • Average rainfall in April: 4.3"

Wettest months (with the highest rainfall) are October and November (4.9").
The driest month (with the lowest rainfall) is August (3.1").

Average rainfall days in April - Portland, ME
  • Average rainfall days in April: 11.2 days

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is September (9.2 days).

Average snowfall in April - Portland, ME
  • Average snowfall in April: 2.8"

The month with the highest snowfall is January (19.2").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in April - Portland, ME
  • Average snowfall days in April: 1 days

The month with the highest number of snowfall days is January (7.9 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in April - Portland, ME
  • Average sea temperature in April: 41.6°F

The best month for swimming (with the highest average sea temperature) is August (63.7°F).
The coldest month (with the lowest average sea temperature) is March (38°F).

Average daylight in April / Average sunshine in April - Portland, ME
  • Average daylight in April: 13.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in April: 7.1h

The month with most sunshine is July (Average sunshine: 9.1h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in April - Portland, ME
  • Average UV index in April: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).