September weather forecastMarkham, TX
September
Weather in September
The first month of the autumn, September, is also a hot month in Markham, Texas, with an average temperature fluctuating between 73.2°F (22.9°C) and 87.3°F (30.7°C).Temperature
The shift from August to September is characterized by an average high-temperature of a still hot 87.3°F (30.7°C), not significantly different from the 92.5°F (33.6°C) of August. In Markham, the average temperature during the nights of September drops to an agreeable 73.2°F (22.9°C).Heat index
In September, the average heat index is appraised at a sweltering 102.2°F (39°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.Heat index readings emphasize conditions of light breezes and shaded spots. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.
Humidity
In Markham, Texas, the average relative humidity in September is 77%.Rainfall
The month with the most rainfall is September, when the rain falls for 18.7 days and typically aggregates up to 3.94" (100mm) of precipitation.Snowfall
February through December are months without snowfall in Markham.Daylight
The average length of the day in September in Markham is 12h and 19min.On the first day of September in Markham, sunrise is at 7:02 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:10 pm CDT.
Sunshine
In September, the average sunshine in Markham is 8.2h.UV index
In Markham, Texas, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Markham, TX
- Average high temperature in September: 87.3°F
The warmest month (with the highest average high temperature) is August (92.5°F).
The month with the lowest average high temperature is January (61.9°F).
- Average low temperature in September: 73.2°F
The month with the highest average low temperature is August (77°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).
Average pressure in September
Markham, TX
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Markham, TX
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).
Average humidity in September
Markham, TX
- Average humidity in September: 77%
The months with the highest relative humidity are February and March (79%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Markham, TX
- Average rainfall in September: 3.94"
The wettest month (with the highest rainfall) is September (3.94").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in September
Markham, TX
- Average rainfall days in September: 18.7 days
The month with the highest number of rainy days is September (18.7 days).
The month with the least rainy days is January (11.9 days).
Average snowfall in September
Markham, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Markham, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Markham, TX
- Average daylight in September: 12h and 18min
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 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days in September
Markham, TX
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is September (9.5 days).
Average UV index in September
Markham, 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
Markham, TX
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Markham, 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).
