April weather forecast and climate
South Portland, ME

Weather in April

April is a frosty spring month in South Portland, Maine, with average temperature varying between 47.8°F (8.8°C) and 38.1°F (3.4°C).

Temperature

In April, the average high-temperature increases, from a cold 38.3°F (3.5°C) in March, to a chilly 47.8°F (8.8°C). In April, the average low-temperature is 38.1°F (3.4°C).

Humidity

In April, the average relative humidity is 77%.

Rainfall

In South Portland, Maine, in April, during 13.2 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In South Portland, Maine, during the entire year, the rain falls for 127 days and collects up to 21.93" (557mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in South Portland. April is the last month it regularly snows. During 1.6 snowfall days, South Portland aggregates 0.67" (17mm) of snow. In South Portland, during the entire year, snow falls for 29.7 days, and aggregates up to 11.73" (298mm) of snow.

Ocean temperature

In South Portland, in April, the average water temperature is 41.5°F (5.3°C).
Note: Swimming in 41.5°F (5.3°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

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

Sunshine

In April, the average sunshine is 8.1h.

UV index

In April, the average daily maximum UV index in South Portland is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
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.
[Resources]

FAQ

What is the average humidity in April in South Portland?

The average relative humidity in April in South Portland is 77%.

How many days does it rain in April in South Portland?

In South Portland, Maine, in April, during 13.2 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

What is the last month it snows in South Portland?

April is the last month it regularly snows in South Portland, Maine. During 1.6 snowfall days, in April, South Portland aggregates 0.67" (17mm) of snow.

How cold is the water in April in South Portland?

In April, the average ocean temperature in South Portland is 41.5°F (5.3°C). Swimming in 41.5°F (5.3°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 South Portland have in April?

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

How many hours of sunshine does South Portland have in April?

In South Portland, Maine, the average sunshine in April is 8.1h.

What is the UV index intensity in April in South Portland?

In South Portland, the average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in April
South Portland, ME

Average temperature in April - South Portland, ME
  • Average high temperature in April: 47.8°F

The warmest month (with the highest average high temperature) is July (72.5°F).
The month with the lowest average high temperature is January (31.1°F).

  • Average low temperature in April: 38.1°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

[Resources]

Average pressure in April
South Portland, ME

Average pressure in April - South Portland, ME
  • Average pressure in April: 29.96"

Months with the highest atmospheric pressure are September and November (30.05").
The month with the lowest atmospheric pressure is June (29.91").

[Resources]

Average wind speed in April
South Portland, ME

Average wind speed in April - South Portland, ME
  • Average wind speed in April: 10.4mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).

[Resources]

Average humidity in April
South Portland, ME

Average humidity in April - South Portland, ME
  • Average humidity in April: 77%

Months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is November (74%).

[Resources]

Average rainfall in April
South Portland, ME

Average rainfall in April - South Portland, ME
  • Average rainfall in April: 2.05"

The wettest month (with the highest rainfall) is October (2.36").
The driest month (with the least rainfall) is September (1.18").

[Resources]

Average rainfall days in April
South Portland, ME

Average rainfall days in April - South Portland, ME
  • Average rainfall days in April: 13.2 days

The month with the highest number of rainy days is July (14.7 days).
The month with the least rainy days is January (5.7 days).

[Resources]

Average snowfall in April
South Portland, ME

Average snowfall in April - South Portland, ME
  • Average snowfall in April: 0.67"

The month with the highest snowfall is February (2.91").
Months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in April
South Portland, ME

Average snowfall days in April - South Portland, ME
  • Average snowfall days in April: 1.6 days

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

[Resources]

Average sea temperature in April
South Portland, ME

Average sea temperature in April - South 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).

[Resources]

Average daylight in April /
Average sunshine in April
South Portland, ME

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

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

  • Average sunshine in April: 8.1h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.8h).

[Resources]

Average sunshine days in April
South Portland, ME

Average sunshine days in April - South Portland, ME
  • Average sunshine days in April: 14.3 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (13.8 days).

[Resources]

Average UV index in April
South Portland, ME

Average UV index in April - South Portland, ME
  • Average UV index in April: 3

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

[Resources]

Average cloud cover in April
South Portland, ME

Average cloud cover in April - South Portland, ME
  • Average cloud cover in April: 47

The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 29).

[Resources]

Average visibility in April
South Portland, ME

Average visibility in April - South Portland, ME
  • Average visibility in April: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location