Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The beginning of September records an average high-temperature of a still hot 86.2°F (30.1°C), almost echoing the conditions of the previous month. September nights in Port Isabel, Texas, anticipate an average temperature of 80.4°F (26.9°C), a modest decline from the daytime.Heat index
The heat index for September is evaluated at a torrid 96.8°F (36°C). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.
Humidity
In Port Isabel, Texas, the average relative humidity in September is 74%.Rainfall
September is the month with the most rainfall. Rain falls for 19.8 days and accumulates 4.13" (105mm) of precipitation.Ocean temperature
In September, the average ocean temperature is 84.6°F (29.2°C).Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.
Daylight
In September, the average length of the day is 12h and 18min.On the first day of the month, sunrise is at 7:09 am and sunset at 7:47 pm. On the last day of September, in Port Isabel, Texas, sunrise is at 7:21 am and sunset at 7:16 pm CDT.
Sunshine
The average sunshine in September in Port Isabel is 9h.UV index
April through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 7 during September translates into the following directions:
Prevent overexposure. Protection from the sun's harmful effects is needed. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Warning! Sand and water reflections boost the intensity of UV exposure.
Frequently asked questions
How hot does it get in Port Isabel in September?
What is the average humidity in September in Port Isabel?
What is the rainiest month in Port Isabel?
How many days does it rain in September in Port Isabel?
How warm is the water in September in Port Isabel?
How many hours of daylight does Port Isabel have in September?
When are sunrise and sunset in September in Port Isabel?
How long on average sun shines in September in Port Isabel?
When is the highest UV index in Port Isabel?
What is the UV index reading in September in Port Isabel?
Average temperature in September
Port Isabel, TX
- Average high temperature in September: 86.2°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 September: 80.4°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 September
Port Isabel, TX
- Average pressure in September: 29.91"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 September
Port Isabel, TX
- Average wind speed in September: 10.9mph
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 September
Port Isabel, TX
- Average humidity in September: 74%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Port Isabel, TX
- Average rainfall in September: 4.13"
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 September
Port Isabel, TX
- Average rainfall days in September: 19.8 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 September
Port Isabel, TX
- Average sea temperature in September: 84.6°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 September /
Average sunshine in September
Port Isabel, TX
- Average daylight in September: 12h and 2min
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 September: 9h and 0min
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 September
Port Isabel, TX
- Average sunshine days in September: 7.2 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 September
Port Isabel, TX
- Average UV index in September: 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 September
Port Isabel, TX
- Average cloud cover in September: 29
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 September
Port Isabel, TX
- Average visibility in September: 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).
Port Isabel, Texas, USA
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