April weather forecastSouth Portland, ME
April
Weather in April
April's arrival greets South Portland with noticeable signs of spring. A sudden rise in temperature enhances the blooming of nature as the city's weather evolves from 38.1°F (3.4°C) in March to a promising 47.8°F (8.8°C). The sight of snow becomes uncommon, replaced more often by rainfall with nature responding in kind. As the last snow melts, the city gets ready to embrace the refreshing sights and sounds of spring. The sweetness of the April air and the longer daylight hours entice residents outdoors for seasonal activities.Temperature
With the beginning of April, South Portland's average high-temperature sees an increase, transitioning from a cold 38.3°F (3.5°C) in March to a frosty 47.8°F (8.8°C). During April, South Portland experiences an average low-temperature of 38.1°F (3.4°C) at night.Humidity
In April, the average relative humidity in South Portland is 77%.Rainfall
In South Portland, in April, during 13.2 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. Throughout the year, in South Portland, there are 127 rainfall days, and 21.93" (557mm) of precipitation is accumulated.Snowfall
Months with snowfall in South Portland are January through April, October through December. April is the last month it regularly snows in South Portland. During 1.6 snowfall days, in April, South Portland aggregates 0.67" (17mm) of snow. Throughout the year, in South Portland, there are 29.7 snowfall days, and 11.73" (298mm) of snow is accumulated.Ocean temperature
In South Portland, in April, the average water temperature is 41.5°F (5.3°C).Note: Diving into 41.5°F (5.3°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
In April, the average length of the day in South Portland is 13h and 28min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:08 pm. On the last day of April, sunrise is at 5:33 am and sunset at 7:42 pm EDT.
Sunshine
In April, the average sunshine is 8.1h.UV index
The average daily maximum UV index in April in South Portland is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The UV index of 3 during April translates into the following guidance:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in April
South Portland, ME
- Average pressure in April: 29.96"Hg
The months with the highest atmospheric pressure are September and November (30.05"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
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).
Average humidity in April
South Portland, ME
- Average humidity in April: 77%
The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is November (74%).
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").
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).
Average snowfall in April
South Portland, ME
- Average snowfall in April: 0.67"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August and September (0").
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).
The months with the least snowfall days are May, June, July, August and September (0 days).
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).
Average daylight in April /
Average sunshine in April
South Portland, ME
- Average daylight in April: 13h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in April: 8h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
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).
Average UV index in April
South Portland, ME
- Average UV index in April: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
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).
Average visibility in April
South Portland, ME
- 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).
