May weather forecastLewisville, TX
May
Weather in May
May marks the beginning of summer in Lewisville, characterized by considerably warmer days compared to the preceding spring months. Notably high rainfall of 3.62" (92mm) coupled with a high relative humidity of 71%, brings about a humid temperate climate. The increased daylight hours favor outdoor activities, while the evenings cool down with the setting sun. With June around the corner, temperatures continue to rise, offering more beach days for the locals.Temperature
With the beginning of May, Lewisville's average high-temperature sees a minor increase, transitioning from a moderately hot 74.8°F (23.8°C) in April to a still warm 82.2°F (27.9°C). An average temperature of 64.8°F (18.2°C) is recorded during the nights in May.Heat index
The heat index in May is computed to be a hot 87.8°F (31°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Take into consideration that the heat index values are calculated for shade and light wind conditions. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Humidity
The most humid month is May, with an average relative humidity of 71%.Rainfall
In May, in Lewisville, the rain falls for 14.3 days. Throughout May, 3.62" (92mm) of precipitation is accumulated. Throughout the year, there are 132.1 rainfall days, and 29.09" (739mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in May in Lewisville is 13h and 53min.On the first day of May, sunrise is at 6:39 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 8:31 pm CDT.
Sunshine
In Lewisville, 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 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: In May, a regular UV index of 7 translates into these guidelines:
Shield from overexposure. Defense against sun-related harm is required. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Lewisville, TX
- Average high temperature in May: 82.2°F
The warmest month (with the highest average high temperature) is August (96.3°F).
The month with the lowest average high temperature is January (54.1°F).
- Average low temperature in May: 64.8°F
The month with the highest average low temperature is August (76.8°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).
Average pressure in May
Lewisville, TX
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Lewisville, TX
- Average wind speed in May: 9.2mph
The windiest months (with the highest average wind speed) are March and April (10.1mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).
Average humidity in May
Lewisville, TX
- Average humidity in May: 71%
The month with the highest relative humidity is May (71%).
The month with the lowest relative humidity is August (53%).
Average rainfall in May
Lewisville, TX
- Average rainfall in May: 3.62"
The wettest month (with the highest rainfall) is October (3.74").
The driest months (with the least rainfall) are January and February (1.57").
Average rainfall days in May
Lewisville, TX
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (6.6 days).
Average snowfall in May
Lewisville, TX
- Average snowfall in May: 0"
The month with the highest snowfall is February (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Lewisville, TX
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Lewisville, TX
- Average daylight in May: 13h and 54min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in May: 8h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in May
Lewisville, TX
- Average sunshine days in May: 15.3 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is September (14.9 days).
Average UV index in May
Lewisville, TX
- Average UV index in May: 7
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in May
Lewisville, TX
- Average cloud cover in May: 36
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in May
Lewisville, TX
- 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).
