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 suggests a modest reduction in the average high-temperature, shifting from a very hot 97.3°F (36.3°C) in August to a hot 87.6°F (30.9°C). Dean's nighttime temperature in September drops to an average of 68.5°F (20.3°C).Heat index
Throughout September, the heat index is calculated to be a very hot 95°F (35°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.Know that the heat index computations account for shaded terrains and slight winds. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.
Humidity
The average relative humidity in September is 60%.Rainfall
In Dean, in September, during 11.7 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, in Dean, there are 104.1 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
In Dean, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 7:07 am and sunset at 7:58 pm. On the last day of September, sunrise is at 7:27 am and sunset at 7:18 pm CDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 6 transforms into these recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Stay sun-safe with clothing that is both closely woven and worn loosely. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How much does it rain in Dean in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Dean have in September?
How high is the UV index in September?
Average temperature in September
Dean, TX
- Average high temperature in September: 87.6°F
The warmest month (with the highest average high temperature) is August (97.3°F).
The month with the lowest average high temperature is December (53.2°F).
- Average low temperature in September: 68.5°F
The month with the highest average low temperature is July (75.9°F).
The coldest month (with the lowest average low temperature) is January (36°F).
Average pressure in September
Dean, 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 (29.87"Hg).
Average wind speed in September
Dean, TX
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is April (11.5mph).
The calmest month (with the lowest average wind speed) is September (8.1mph).
Average humidity in September
Dean, TX
- Average humidity in September: 60%
The month with the highest relative humidity is May (67%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Dean, TX
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days in September
Dean, TX
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is May (13.3 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Dean, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.06").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Dean, TX
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Dean, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in September
Dean, TX
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is May (15.8 days).
Average UV index in September
Dean, TX
- Average UV index in September: 6
The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Dean, TX
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in September
Dean, 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).
Dean, Texas, USA
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