September weather forecastTomball, TX
September
Weather in September
September, the first month of the autumn in Tomball, is still a tropical month, with temperature in the range of an average high of 89.6°F (32°C) and an average low of 72.1°F (22.3°C).Temperature
In the transition to September, Tomball observes a minor drop in the average high-temperature, shifting from a very hot 96.1°F (35.6°C) in August to a tropical 89.6°F (32°C). During September, Tomball experiences an average low-temperature of 72.1°F (22.3°C) at night.Heat index
During September, the heat index is calculated to be a blisteringly hot 105.8°F (41°C). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.Keep in mind the heat index values are meant for areas in shade and with light wind. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.
Humidity
The average relative humidity in September is 72%.Rainfall
In Tomball, in September, during 18.8 rainfall days, 3.62" (92mm) of precipitation is typically accumulated. Throughout the year, in Tomball, there are 175.4 rainfall days, and 34.57" (878mm) of precipitation is accumulated.Snowfall
In Tomball, snow does not fall in February through November.Daylight
In September, the average length of the day is 12h and 20min.On the first day of September, sunrise is at 6:59 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:08 pm CDT.
Sunshine
In September, the average sunshine in Tomball, Texas, is 8.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A daily high UV index of 6 in September leads to these guidelines:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tomball, TX
- Average high temperature in September: 89.6°F
The warmest month (with the highest average high temperature) is August (96.1°F).
The month with the lowest average high temperature is January (60.4°F).
- Average low temperature in September: 72.1°F
The month with the highest average low temperature is August (76.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in September
Tomball, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Tomball, TX
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is September (5.6mph).
Average humidity in September
Tomball, TX
- Average humidity in September: 72%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is August (67%).
Average rainfall in September
Tomball, TX
- Average rainfall in September: 3.62"
The wettest month (with the highest rainfall) is May (4.72").
The driest month (with the least rainfall) is November (1.97").
Average rainfall days in September
Tomball, TX
- Average rainfall days in September: 18.8 days
The month with the highest number of rainy days is September (18.8 days).
The month with the least rainy days is January (11.7 days).
Average snowfall in September
Tomball, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Tomball, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Tomball, TX
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Tomball, TX
- Average sunshine days in September: 9.2 days
The month with the most sunshine days is October (17.1 days).
The month with the least sunshine days is September (9.2 days).
Average UV index in September
Tomball, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Tomball, TX
- Average cloud cover in September: 35
The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Tomball, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are March, April and July (5mi).
