May weather forecastLewes, DE
May
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 14h and 18min
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 18min
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: 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: 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: 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: 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).
