May weather forecast and climate
Lewes, DE

Weather in May

The last month of the spring, May, is a comfortable month in Lewes, Delaware, with average temperature varying between 66.4°F (19.1°C) and 58.1°F (14.5°C).

Temperature

In May, the average high-temperature marginally rises, from a mild 57.6°F (14.2°C) in April, to an enjoyable 66.4°F (19.1°C). The average low-temperature, in Lewes, is 58.1°F (14.5°C).

Humidity

May is the most humid month, with an average relative humidity of 81%.

Rainfall

In May, in Lewes, the rain falls for 18.2 days. Throughout May, 3.35" (85mm) of precipitation is accumulated. Throughout the year, in Lewes, there are 173.6 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

In Lewes snow does not fall in April through October.

Ocean temperature

In Lewes, in May, the average water temperature is 56.8°F (13.8°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 Lewes, the average length of the day is 14.3h.

Sunshine

In May, the average sunshine is 9.3h.

UV index

Months with the highest UV index in Lewes are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

What is the most humid month in Lewes?

May is the most humid month in Lewes, with an average relative humidity of 81%.

What is the average humidity in May in Lewes?

The average relative humidity in May in Lewes, Delaware, is 81%.

How many days does it rain in May in Lewes?

In Lewes, in May, it is raining for 18.2 days, with typically 3.35" (85mm) of accumulated precipitation.

When it does not snow in Lewes?

April through October are months without snowfall.

What is the water temperature in May in Lewes?

In May, the average ocean temperature in Lewes, Delaware, is 56.8°F (13.8°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 May in Lewes?

The average length of the day in May in Lewes, Delaware, is 14.3h.

How long on average sun shines in May in Lewes?

In Lewes, Delaware, the average sunshine in May is 9.3h.

What is the month with the highest UV index in Lewes?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Lewes, Delaware.

What is the UV index intensity in May in Lewes?

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Lewes, DE

Average temperature in May - Lewes, DE
  • Average high temperature in May: 66.4°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in May: 58.1°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (32°F).

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Average pressure in May
Lewes, DE

Average pressure in May - Lewes, DE
  • Average pressure in May: 30.02"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in May
Lewes, DE

Average wind speed in May - Lewes, DE
  • Average wind speed in May: 10.2mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in May
Lewes, DE

Average humidity in May - Lewes, DE
  • Average humidity in May: 81%

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in May
Lewes, DE

Average rainfall in May - Lewes, DE
  • Average rainfall in May: 3.35"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.2").

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Average rainfall days in May
Lewes, DE

Average rainfall days in May - Lewes, DE
  • Average rainfall days in May: 18.2 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is January (9.6 days).

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Average snowfall in May
Lewes, DE

Average snowfall in May - Lewes, DE
  • Average snowfall in May: 0"

The month with the highest snowfall is January (0.98").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Lewes, DE

Average snowfall days in May - Lewes, DE
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (3.7 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average sea temperature in May
Lewes, DE

Average sea temperature in May - Lewes, DE
  • Average sea temperature in May: 56.8°F

The best month for swimming (with the highest average sea temperature) is August (76.9°F).
The coldest month (with the lowest average sea temperature) is February (40.7°F).

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Average daylight in May /
Average sunshine in May
Lewes, DE

Average daylight in May / Average sunshine in May - Lewes, DE
  • Average daylight in May: 14.3h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in May: 9.3h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is February (Average sunshine: 5h).

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Average sunshine days in May
Lewes, DE

Average sunshine days in May - Lewes, DE
  • Average sunshine days in May: 9.8 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (9.8 days).

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Average UV index in May
Lewes, DE

Average UV index in May - Lewes, DE
  • Average UV index in May: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in May
Lewes, DE

Average cloud cover in May - Lewes, DE
  • Average cloud cover in May: 38

Months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).

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Average visibility in May
Lewes, DE

Average visibility in May - Lewes, DE
  • Average visibility in May: 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).

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