May weather forecast
Wilmington, DE

Bright neon lights light up the Central Business District of Wilmington, Delaware, with a scenic reflection in the Christian River
Bright neon lights light up the Central Business District of Wilmington, Delaware, with a scenic reflection in the Christian River

Weather in May

The last month of the spring, May, is a pleasant month in Wilmington, Delaware, with average temperature varying between 71.6°F (22°C) and 54.5°F (12.5°C).

Temperature

In May, the average high-temperature rises, from an enjoyable 61.3°F (16.3°C) in April, to an agreeable 71.6°F (22°C). In May, in Wilmington, the average low-temperature is 54.5°F (12.5°C).

Humidity

In May, the average relative humidity in Wilmington is 77%.

Rainfall

In Wilmington, in May, during 18.7 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. In Wilmington, during the entire year, the rain falls for 168.9 days and collects up to 35.55" (903mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Wilmington aggregates 0.12" (3mm) of snow. In Wilmington, during the entire year, snow falls for 21.9 days, and aggregates up to 12.05" (306mm) of snow.

Ocean temperature

In Wilmington, Delaware, in May, the average water temperature is 50°F (10°C).
Note: Swimming in 50°F (10°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 May, the average length of the day is 14.4h.

Sunshine

In Wilmington, the average sunshine is 8.6h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Wilmington. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 6 in May interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Wilmington?

The average relative humidity in May is 77%.

How many days does it rain in May in Wilmington?

In May, in Wilmington, Delaware, the rain falls for 18.7 days. Throughout May, 3.19" (81mm) of precipitation is accumulated.

What is the last month it snows in Wilmington?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Wilmington aggregates 0.12" (3mm) of snow.

What is the ocean temperature in May in Wilmington?

In May, the average ocean temperature in Wilmington, Delaware, is 50°F (10°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 Wilmington?

The average length of the day in May in Wilmington, Delaware, is 14.4h.

How many hours of sunshine does Wilmington have in May?

In Wilmington, the average sunshine in May is 8.6h.

When is the highest UV index in Wilmington?

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

How high is the UV index in May in Wilmington?

In Wilmington, Delaware, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in May
Wilmington, DE

Average temperature in May - Wilmington, DE
  • Average high temperature in May: 71.6°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in May: 54.5°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).

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Average pressure in May
Wilmington, DE

Average pressure in May - Wilmington, DE
  • Average pressure in May: 30.01"

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
Wilmington, DE

Average wind speed in May - Wilmington, DE
  • Average wind speed in May: 6.8mph

The windiest months (with the highest average wind speed) are January, February and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in May
Wilmington, DE

Average humidity in May - Wilmington, DE
  • Average humidity in May: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in May
Wilmington, DE

Average rainfall in May - Wilmington, DE
  • Average rainfall in May: 3.19"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (2.36").

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Average rainfall days in May
Wilmington, DE

Average rainfall days in May - Wilmington, DE
  • Average rainfall days in May: 18.7 days

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (8.8 days).

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Average snowfall in May
Wilmington, DE

Average snowfall in May - Wilmington, DE
  • Average snowfall in May: 0.12"

The month with the highest snowfall is March (3.58").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Wilmington, DE

Average snowfall days in May - Wilmington, DE
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (6.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in May
Wilmington, DE

Average sea temperature in May - Wilmington, DE
  • Average sea temperature in May: 50°F

The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (34°F).

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

Average daylight in May / Average sunshine in May - Wilmington, DE
  • Average daylight in May: 14.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in May: 8.6h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in May
Wilmington, DE

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

The month with the most sunshine days is November (18.6 days).
Months with the least sunshine days are May and July (9.8 days).

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Average UV index in May
Wilmington, DE

Average UV index in May - Wilmington, 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, February, November and December (UV index 2).

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Average cloud cover in May
Wilmington, DE

Average cloud cover in May - Wilmington, DE
  • Average cloud cover in May: 46

Months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in May
Wilmington, DE

Average visibility in May - Wilmington, 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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