May weather forecast
Lewes, DE

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Weather in May

May is the month where spring makes its graceful exit to welcome the warmth of summer. The increasing warmth is apparent in the steady rise in temperature, with morning lows averaging at 58.1°F (14.5°C) and daytime highs climbing to a delightful 66.4°F (19.1°C). May’s mild weather contrasts sharply with the comparative coolness of April. A noticeable rise in humidity levels and an influx of bright sunshine hours mark a clear shift towards summer. Meanwhile, the total absence of snowfall truly sets the month apart as a summer herald.

Temperature

May witnesses a minor rise in the average high-temperature, transitioning from a mild 57.6°F (14.2°C) in April to a comfortable 66.4°F (19.1°C). An average low-temperature of 58.1°F (14.5°C), slightly less than the daytime peak, marks the month of May.

Humidity

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

Rainfall

In Lewes, during May, the rain falls for 18.2 days and regularly aggregates up to 3.35" (85mm) of precipitation. In Lewes, Delaware, during the entire year, the rain falls for 173.6 days and collects up to 36.97" (939mm) of precipitation.

Snowfall

In Lewes, Delaware, 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: You can swim in 56.8°F (13.8°C) below 50°F (10°C) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 55.4°F (13°C) without it is tough.

Daylight

In Lewes, Delaware, the average length of the day in May is 14h and 18min.
On the first day of May in Lewes, sunrise is at 6:01 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:19 pm EDT.

Sunshine

In May, the average sunshine is 9.3h.

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 risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 6 in May translates into this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average May temperature?

The high-temperature, in May, in Lewes, records 66.4°F (19.1°C), while the low-temperature is 58.1°F (14.5°C).

What is the most humid month?

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

What is the average humidity in May?

In May, the average relative humidity is 81%.

How many days does it rain in May?

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, snow does not fall in April through October.

What is the ocean temperature in May?

In Lewes, the average seawater temperature in May is 56.8°F (13.8°C). Swimming in 56.8°F (13.8°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 Lewes have in May?

The average day length in May is 14h and 18min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 6:01 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:19 pm EDT.

How long on average sun shines in May?

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

What is the month with the highest UV index?

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

How high is the UV index in May?

In May, the average daily maximum UV index in Lewes is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
57.6°F 14.2°C
66.4°F 19.1°C
75.4°F 24.1°C
Average low temperature
48.6°F 9.2°C
58.1°F 14.5°C
67.6°F 19.8°C
Average pressure
30" 762mmHg
30.02" 763mmHg
29.94" 760mmHg
Average wind speed
11.9mph 19.2km/h
10.2mph 16.4km/h
9.3mph 15km/h
Average max. wind speed
12.8mph 20.6km/h
10.9mph 17.5km/h
9.9mph 15.9km/h
Average wind speed gusts
20.6mph 33.2km/h
17.5mph 28.2km/h
15.9mph 25.6km/h
Average humidity
76%
81%
80%
Average rainfall
2.56" 65mm
3.35" 85mm
3.43" 87mm
Average rainfall days
15.6
18.2
17
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
48.5°F 9.2°C
56.8°F 13.8°C
68.2°F 20.1°C
Average daylight
13h 1min
14h 2min
14h 5min
Average sunshine
9h 0min
9h 2min
10h 3min
Average sunshine days
12.8
9.8
10.8
Average UV index
4
6
6
Average cloud cover
39%
38%
29%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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).

Average pressure in May
Lewes, DE

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

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

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).

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%).

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").

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).

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").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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).

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

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in May: 9h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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).

Average UV index in May
Lewes, DE

Average UV index in May - Lewes, 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 and December (UV index 2).

Average cloud cover in May
Lewes, DE

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

The 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).

Average visibility in May
Lewes, DE

Average visibility in May - Lewes, 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).

Lewes, Delaware, USA

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