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 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 signifies a minor drop in average high-temperature, transitioning from a sweltering 96.6°F (35.9°C) in August to a tropical 88.7°F (31.5°C). The temperature in Castle Hills dips to an average of 71.6°F (22°C) during September nights.Heat index
In September, the average heat index is calculated to be a torrid 100.4°F (38°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
In September, the average relative humidity is 67%.Rainfall
In Castle Hills, in September, during 15.9 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. In Castle Hills, Texas, during the entire year, the rain falls for 155.9 days and collects up to 22.76" (578mm) of precipitation.Snowfall
March through December are months without snowfall in Castle Hills.Daylight
The average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 7:11 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:20 pm CDT.
Sunshine
In Castle Hills, the average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September in Castle Hills, Texas, is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 6 in September translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Castle Hills in September?
What is the average humidity in September in Castle Hills?
How many days does it rain in September in Castle Hills?
When it does not snow in Castle Hills?
How many hours of daylight does Castle Hills have in September?
When are sunrise and sunset in September in Castle Hills?
How many hours of sunshine does Castle Hills have in September?
What is the UV index reading in September in Castle Hills?
Average temperature in September
Castle Hills, TX
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (61.2°F).
- Average low temperature in September: 71.6°F
The month with the highest average low temperature is August (75°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in September
Castle Hills, TX
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Castle Hills, TX
- Average wind speed in September: 6.4mph
The windiest months (with the highest average wind speed) are February, March, April and May (8.8mph).
The calmest month (with the lowest average wind speed) is September (6.4mph).
Average humidity in September
Castle Hills, TX
- Average humidity in September: 67%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).
Average rainfall in September
Castle Hills, TX
- Average rainfall in September: 3.19"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days in September
Castle Hills, TX
- Average rainfall days in September: 15.9 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and August (9.3 days).
Average snowfall in September
Castle Hills, TX
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Castle Hills, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.4 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
Castle Hills, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Castle Hills, TX
- Average sunshine days in September: 12.2 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in September
Castle Hills, TX
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Castle Hills, TX
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Castle Hills, 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).
Castle Hills, Texas, USA
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