Weather in May
May amplifies the spring signals in the Cape Cod National Seashore area. The month observes a lasting increase in sea temperatures, signaling a definitive departure from the colder months. Daily average daylight extends further, making room for increased outdoor activities. Dowelled between April's end and June's onset, May makes a natural transition towards the warmth of summer.
Note: Dipping into 49.1°F (9.5°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.
On the first day of the month, sunrise is at 5:34 am and sunset at 7:38 pm. On the last day of May, sunrise is at 5:07 am and sunset at 8:08 pm EDT.
Ocean temperature
In May, the average ocean temperature is 49.1°F (9.5°C).Note: Dipping into 49.1°F (9.5°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.
Daylight
In May, the average length of the day is 14h and 34min.On the first day of the month, sunrise is at 5:34 am and sunset at 7:38 pm. On the last day of May, sunrise is at 5:07 am and sunset at 8:08 pm EDT.
Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is the water in May?
In May, the average ocean temperature is 49.1°F (9.5°C). Swimming in 49.1°F (9.5°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 Cape Cod National Seashore have in May?
The average day length in May is 14h and 34min.
When are sunrise and sunset in May?
In May, on the first day of the month, sunrise is at 5:34 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:07 am and sunset at 8:08 pm EDT.
Average sea temperature in May
Cape Cod National Seashore, MA
- Average sea temperature in May: 49.2°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in May
Cape Cod National Seashore, MA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
Cape Cod National Seashore, Massachusetts, USA
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