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 snowfall days 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
September ushers in a minute temperature change, with average high-temperatures reducing from August's sweltering 100°F (37.8°C) to a tropical 92.5°F (33.6°C). In Islitas, the average nighttime temperature during September is a warm 76.1°F (24.5°C).Heat index
The average heat index in September is evaluated at a blisteringly hot 105.8°F (41°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.Evaluating the heat index requires understanding its values in the shade and with gentle winds. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', blends air temperature and moisture content to represent the felt temperature to humans. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.
Humidity
The average relative humidity in September is 60%.Rainfall
September is the month with the most rainfall. Rain falls for 12.9 days and accumulates 2.17" (55mm) of precipitation.Snowfall
In Islitas, Texas, snow does not fall in March through November.Daylight
The average length of the day in September in Islitas is 12h and 19min.On the first day of September, sunrise is at 7:17 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:25 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In September, the average daily maximum UV index in Islitas, Texas, is 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 7 transforms into these recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Frequently asked questions
How hot is it in Islitas in September?
What is the average humidity in September in Islitas?
What is the rainiest month in Islitas?
How much does it rain in Islitas in September?
When it does not snow in Islitas?
What is the average length of the day in September in Islitas?
When is the sunrise / sunset in September in Islitas?
How many hours of sunshine does Islitas have in September?
What is the UV index reading in September in Islitas?
Average temperature in September
Islitas, TX
- Average high temperature in September: 92.5°F
The warmest month (with the highest average high temperature) is August (100°F).
The month with the lowest average high temperature is January (66.9°F).
- Average low temperature in September: 76.1°F
The month with the highest average low temperature is August (79.9°F).
The coldest month (with the lowest average low temperature) is January (50.2°F).
Average pressure in September
Islitas, TX
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are May and June (29.86"Hg).
Average wind speed in September
Islitas, TX
- Average wind speed in September: 10mph
The windiest month (with the highest average wind speed) is July (13.5mph).
The calmest month (with the lowest average wind speed) is December (8.9mph).
Average humidity in September
Islitas, TX
- Average humidity in September: 60%
The month with the highest relative humidity is December (62%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
Islitas, TX
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is September (2.17").
The driest month (with the least rainfall) is February (0.43").
Average rainfall days in September
Islitas, TX
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is September (12.9 days).
The month with the least rainy days is November (5.5 days).
Average snowfall days in September
Islitas, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Islitas, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Islitas, TX
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is September (15.1 days).
Average UV index in September
Islitas, TX
- Average UV index in September: 7
The months with the highest UV index are July and August (UV index 8).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Islitas, TX
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Islitas, 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).
Islitas, Texas, USA
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