![]() ![]() A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals. UV indexThe average daily maximum UV index in September is 6. SunshineIn Houston, the average sunshine in September is 8.6h. On the last day of the month, sunrise is at 7:14 am and sunset at 7:08 pm CDT. On the first day of September in Houston, sunrise is at 6:58 am and sunset at 7:44 pm. DaylightIn September, the average length of the day is 12h and 20min. Snowfall February through November are months without snowfall. RainfallThe month with the most rainfall is September, when the rain falls for 19.5 days and typically aggregates up to 4.49" (114mm) of precipitation. HumidityIn September, the average relative humidity in Houston is 74%. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. 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. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, differences in body mass, height, and shape), and activity. Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', 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. Heatstroke may occur with lengthy activity. Take special precautions - heat exhaustion and heat cramps are expected. Heat indexIn September, the average heat index is appraised at a scorching 104☏ (40☌). In Houston, in September, the average low-temperature is 72.7☏ (22.6☌). TemperatureIn September, the average high-temperature marginally drops from a hot 94.3☏ (34.6☌) in August to a still tropical 88.3☏ (31.3☌). The first month of the autumn, September, is still a hot month in Houston, Texas, with temperature in the range of an average high of 88.3☏ (31.3☌) and an average low of 72.7☏ (22.6☌). ![]()
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