![]() when UV radiation is most intense keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. Take precautions and adopt sun safety practices. Note: The daily maximum UV index of 6 in September interpret into the following advice: A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals. UV indexThe average daily maximum UV index in September in San Antonio is 6. SunshineThe average sunshine in September is 8.4h. On the last day of September, in San Antonio, sunrise is at 7:26 am and sunset at 7:21 pm CDT. ![]() On the first day of the month, sunrise is at 7:11 am and sunset at 7:56 pm. DaylightIn San Antonio, the average length of the day in September is 12h and 20min. Snowfall March through November are months without snowfall in San Antonio. Throughout the year, in San Antonio, there are 144.5 rainfall days, and 22.6" (574mm) of precipitation is accumulated. Rainfall In San Antonio, during September, the rain falls for 17 days and regularly aggregates up to 3.39" (86mm) of precipitation. HumidityIn San Antonio, Texas, the average relative humidity in September is 66%. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5☏ (37.5☌) to 100.9☏ (38.3☌), thermal conditions are potentially life-threatening. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity. Young children are generally more endangered than adults, as they usually less sweat. Heat index values are especially crucial for babies and toddlers. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Additional factors like clothing, pregnancy, differences in body mass, height, and shape, and activity influence one's weather impression. Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees. Take into consideration that the heat index values are calculated for shade and light wind conditions. Sustained activity may result in heatstroke. Take extra precautions, as heat cramps and heat exhaustion are possible. Heat indexThe average heat index in September is computed to be a very hot 100.4☏ (38☌). In September, in San Antonio, the average low-temperature is 71.6☏ (22☌). ![]() TemperatureIn San Antonio, the average high-temperature in September marginally drops from a very hot 96.6☏ (35.9☌) in August to a hot 89.1☏ (31.7☌). September, the first month of the autumn in San Antonio, is still a tropical month, with an average temperature ranging between max 89.1☏ (31.7☌) and min 71.6☏ (22☌).
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