May weather forecast
Delaware City, DE

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Weather in May

May is characterized by the onset of warmer weather as summer begins to creep in. The city receives an increased amount of sunlight, enhancing the daylight hours. This period is ideal for outdoor activities and is heralded by the blooming of flowers and trees. May experiences an average high temperature of 72°F (22.2°C), a noticeable increase from April's number. Combined with the absence of snow, it's clear that winter has finally retreated making way for summer.

Temperature

May's arrival signals an increase in average high-temperatures, moving from April's enjoyable 62.4°F (16.9°C) to a pleasant 72°F (22.2°C). Delaware City's nighttime temperature in May drops to an average of 55°F (12.8°C).

Humidity

The average relative humidity in May is 77%.

Rainfall

In May, the rain falls for 16.4 days. Throughout May, 2.17" (55mm) of precipitation is accumulated. Throughout the year, there are 145.9 rainfall days, and 24.45" (621mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Ocean temperature

In Delaware City, the average seawater temperature in May is 54°F (12.2°C).
Note: Entering waters of 54°F (12.2°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 Delaware City, the average length of the day in May is 14h and 22min.
On the first day of May, sunrise is at 6:02 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:23 pm EDT.

Sunshine

The average sunshine in May is 8.7h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index, 6 during May, leads to the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Updated: Jul 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

May temperatures vary between a high-temperature of 72°F (22.2°C) and a low-temperature of 55°F (12.8°C).

What is the average humidity in May?

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

How much does it rain in May?

In May, the rain falls for 16.4 days. Throughout May, 2.17" (55mm) of precipitation is accumulated.

When it does not snow in Delaware City?

May through October are months without snowfall in Delaware City, Delaware.

Does it snow in May?

In May, it doesn't snow. April is the latest month when it typically snows.

What is the ocean temperature in May?

In Delaware City, in May, the average water temperature is 54°F (12.2°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.

How many hours of daylight does Delaware City have in May?

In Delaware City, the average day length in May is 14h and 22min.

When are sunrise and sunset in May?

On the first day of May, sunrise is at 6:02 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:23 pm EDT.

How many hours of sunshine does Delaware City have in May?

In Delaware City, the average sunshine duration in May is 8.7h.

When is the highest UV index?

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

How high is the UV index in May?

The average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
62.4°F 16.9°C
72°F 22.2°C
80.1°F 26.7°C
Average low temperature
46°F 7.8°C
55°F 12.8°C
63°F 17.2°C
Average pressure
29.99" 762mmHg
30.01" 762mmHg
29.94" 760mmHg
Average wind speed
8.8mph 14.2km/h
7.1mph 11.4km/h
6.6mph 10.6km/h
Average max. wind speed
9.6mph 15.4km/h
7.6mph 12.2km/h
7.1mph 11.4km/h
Average wind speed gusts
13.5mph 21.7km/h
10.8mph 17.4km/h
10.3mph 16.6km/h
Average humidity
72%
77%
77%
Average rainfall
1.89" 48mm
2.17" 55mm
2.2" 56mm
Average rainfall days
13.4
16.4
14.8
Average snowfall
0.04" 1mm
0" 0mm
0" 0mm
Average snowfall days
0.1
0
0
Average sea temperature
47.6°F 8.7°C
53.9°F 12.2°C
66.6°F 19.2°C
Average daylight
13h 2min
14h 2min
14h 5min
Average sunshine
8h 4min
8h 4min
10h 1min
Average sunshine days
14.4
11.8
12.8
Average UV index
4
6
6
Average cloud cover
42%
45%
34%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Delaware City, DE

Average temperature in May - Delaware City, DE
  • Average high temperature in May: 72°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in May: 55°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 (26.8°F).

Average pressure in May
Delaware City, DE

Average pressure in May - Delaware City, DE
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in May
Delaware City, DE

Average wind speed in May - Delaware City, DE
  • Average wind speed in May: 7.1mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in May
Delaware City, DE

Average humidity in May - Delaware City, 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%).

Average rainfall in May
Delaware City, DE

Average rainfall in May - Delaware City, DE
  • Average rainfall in May: 2.17"

The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.54").

Average rainfall days in May
Delaware City, DE

Average rainfall days in May - Delaware City, DE
  • Average rainfall days in May: 16.4 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in May
Delaware City, DE

Average snowfall in May - Delaware City, DE
  • Average snowfall in May: 0"

The month with the highest snowfall is January (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in May
Delaware City, DE

Average snowfall days in May - Delaware City, DE
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in May
Delaware City, DE

Average sea temperature in May - Delaware City, DE
  • Average sea temperature in May: 53.9°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

Average daylight in May /
Average sunshine in May
Delaware City, DE

Average daylight in May / Average sunshine in May - Delaware City, DE
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in May
Delaware City, DE

Average sunshine days in May - Delaware City, DE
  • Average sunshine days in May: 11.8 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in May
Delaware City, DE

Average UV index in May - Delaware City, DE
  • Average UV index in May: 6

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

Average cloud cover in May
Delaware City, DE

Average cloud cover in May - Delaware City, DE
  • Average cloud cover in May: 45

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in May
Delaware City, DE

Average visibility in May - Delaware City, DE
  • 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).

Delaware City, Delaware, USA

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