Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
With the beginning of May, South Portland's average high-temperature sees an increase, transitioning from a chilly 47.8°F (8.8°C) in April to a mild 57.4°F (14.1°C). South Portland, during May nights, observes an average temperature of 46.9°F (8.3°C).Humidity
The average relative humidity in May is 81%.Rainfall
In May, the rain falls for 13.2 days. Throughout May, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 127 rainfall days, and 21.93" (557mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall in South Portland.Ocean temperature
In May, the average ocean temperature in South Portland is 46.6°F (8.1°C).Note: Entering waters of 46.6°F (8.1°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
In South Portland, the average length of the day in May is 14h and 44min.On the first day of the month, sunrise is at 5:32 am and sunset at 7:43 pm. On the last day of May, sunrise is at 5:02 am and sunset at 8:15 pm EDT.
Sunshine
The average sunshine in May in South Portland is 8.4h.UV index
In May, the average daily maximum UV index in South Portland, Maine, is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 in May translates into these instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in South Portland in May?
What is the average humidity in May in South Portland?
How many days does it rain in May in South Portland?
When it does not snow in South Portland?
Does it snow in South Portland in May?
What is the water temperature in May in South Portland?
What is the average length of the day in May in South Portland?
What time are sunrise and sunset in May in South Portland?
How many hours of sunshine does South Portland have in May?
How high is the UV index in May in South Portland?
Average temperature in May
South Portland, ME
- Average high temperature in May: 57.4°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 May: 46.9°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 May
South Portland, ME
- Average pressure in May: 29.99"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 May
South Portland, ME
- Average wind speed in May: 9mph
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 May
South Portland, ME
- Average humidity in May: 81%
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 May
South Portland, ME
- Average rainfall in May: 1.85"
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 May
South Portland, ME
- Average rainfall days in May: 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 May
South Portland, ME
- Average snowfall in May: 0"
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 May
South Portland, ME
- Average snowfall days in May: 0 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 May
South Portland, ME
- Average sea temperature in May: 46.7°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 May /
Average sunshine in May
South Portland, ME
- Average daylight in May: 14h and 4min
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 May: 8h and 2min
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 May
South Portland, ME
- Average sunshine days in May: 16 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 May
South Portland, ME
- Average UV index in May: 4
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 May
South Portland, ME
- Average cloud cover in May: 45
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 May
South Portland, ME
- Average visibility in May: 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).
South Portland, Maine, USA
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