Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The start of May sees the average high-temperature at a still hot 93.9°F (34.4°C), showing little difference from April's 90.1°F (32.3°C). In San Isidro, an average low-temperature of 73°F (22.8°C) is recorded during May nights.Heat index
During May, the heat index is evaluated at a scorching 111.2°F (44°C). Beware: Heat exhaustion along with heat cramps are on the cards. Heatstroke could result from sustained physical activity.In reference to the heat index, it's for places in shade and with a slight wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.
Humidity
In May, the average relative humidity is 62%.Rainfall
In May, the rain falls for 9.3 days. Throughout May, 1.69" (43mm) of precipitation is accumulated. In San Isidro, during the entire year, the rain falls for 98.5 days and collects up to 13.11" (333mm) of precipitation.Snowfall
March through December are months without snowfall.Daylight
In May, the average length of the day is 13h and 28min.On the first day of the month, sunrise is at 6:54 am and sunset at 8:06 pm. On the last day of May, sunrise is at 6:40 am and sunset at 8:22 pm CDT.
Sunshine
In May, the average sunshine is 10h.UV index
In May, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In May, the maximum UV index of 7 transforms into these recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in May?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
What is the average length of the day in May?
What time are sunrise and sunset in May in San Isidro?
How many hours of sunshine does San Isidro have in May?
What is the UV index intensity in May?
Average temperature in May
San Isidro, TX
- Average high temperature in May: 93.9°F
The warmest month (with the highest average high temperature) is August (100°F).
The month with the lowest average high temperature is January (69.8°F).
- Average low temperature in May: 73°F
The month with the highest average low temperature is August (80.1°F).
The coldest month (with the lowest average low temperature) is January (52.7°F).
Average pressure in May
San Isidro, TX
- Average pressure in May: 29.87"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in May
San Isidro, TX
- Average wind speed in May: 13.5mph
The windiest month (with the highest average wind speed) is July (13.9mph).
The calmest month (with the lowest average wind speed) is December (9.2mph).
Average humidity in May
San Isidro, TX
- Average humidity in May: 62%
The month with the highest relative humidity is December (65%).
The month with the lowest relative humidity is August (53%).
Average rainfall in May
San Isidro, TX
- Average rainfall in May: 1.69"
The wettest month (with the highest rainfall) is September (2.56").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in May
San Isidro, TX
- Average rainfall days in May: 9.3 days
The month with the highest number of rainy days is September (15.3 days).
The month with the least rainy days is February (5.8 days).
Average snowfall days in May
San Isidro, TX
- Average snowfall days in May: 0 days
The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in May /
Average sunshine in May
San Isidro, TX
- Average daylight in May: 13h and 3min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in May: 10h and 0min
The months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in May
San Isidro, TX
- Average sunshine days in May: 20.5 days
The months with the most sunshine days are July and August (22.6 days).
The month with the least sunshine days is September (12.9 days).
Average UV index in May
San Isidro, TX
- Average UV index in May: 7
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in May
San Isidro, TX
- Average cloud cover in May: 30
The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in May
San Isidro, 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).
San Isidro, Texas, USA
Weather forecast for your location
2. Allow the app to use your location