May weather forecastPort Isabel, TX
May
Weather in May
The last month of the spring, May, is another warm month in Port Isabel, Texas, with an average temperature ranging between min 75.7°F (24.3°C) and max 81.9°F (27.7°C).Temperature
In May, Port Isabel's weather conditions record an average high-temperature of a still moderately hot 81.9°F (27.7°C), demonstrating little divergence from the preceding month. May notes an average low temperature of 75.7°F (24.3°C) in Port Isabel, subtly down from the daytime highs.Heat index
May's average heat index is evaluated at a tropical 87.8°F (31°C). Enduring exposure and unrelenting activity might cause a state of weariness, potentially leading to heat cramps.Data suggests that the heat index is set for environments in shade and with a light wind. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
The most humid month is May, with an average relative humidity of 80%.Rainfall
In Port Isabel, in May, it is raining for 8.4 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, there are 143.2 rainfall days, and 21.38" (543mm) of precipitation is accumulated.Ocean temperature
In Port Isabel, in May, the average water temperature is 77.7°F (25.4°C).Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.
Daylight
In Port Isabel, the average length of the day in May is 13h and 26min.On the first day of May, sunrise is at 6:50 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 8:16 pm CDT.
Sunshine
The average sunshine in May is 10.7h.UV index
The months with the highest UV index are April through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 7 in May transforms into the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be on guard! The reflective nature of sand and water boosts UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Port Isabel, TX
- Average high temperature in May: 81.9°F
The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (67.1°F).
- Average low temperature in May: 75.7°F
The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).
Average pressure in May
Port Isabel, TX
- Average pressure in May: 29.88"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).
Average wind speed in May
Port Isabel, TX
- Average wind speed in May: 14mph
The windiest month (with the highest average wind speed) is April (14.2mph).
The calmest month (with the lowest average wind speed) is September (10.9mph).
Average humidity in May
Port Isabel, TX
- Average humidity in May: 80%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Port Isabel, TX
- Average rainfall in May: 1.18"
The wettest month (with the highest rainfall) is September (4.13").
The driest month (with the least rainfall) is April (0.51").
Average rainfall days in May
Port Isabel, TX
- Average rainfall days in May: 8.4 days
The month with the highest number of rainy days is September (19.8 days).
The month with the least rainy days is March (8.2 days).
Average sea temperature in May
Port Isabel, TX
- Average sea temperature in May: 77.8°F
The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (66.7°F).
Average daylight in May /
Average sunshine in May
Port Isabel, TX
- Average daylight in May: 13h and 24min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in May: 10h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in May
Port Isabel, TX
- Average sunshine days in May: 20.6 days
The month with the most sunshine days is March (20.7 days).
The month with the least sunshine days is September (7.2 days).
Average UV index in May
Port Isabel, TX
- Average UV index in May: 7
The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in May
Port Isabel, TX
- Average cloud cover in May: 28
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in May
Port Isabel, 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).
