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
As September begins, there is a minor decrease in the average high-temperature, softly falling from a torrid 98.6°F (37°C) in August to a hot 92.7°F (33.7°C). September nights in McAllen observe an average temperature dip to a moderately hot 77.2°F (25.1°C).Heat index
The average heat index in September is computed to be a scorching 109.4°F (43°C). Remain cautious: Heat cramps along with heat exhaustion are foreseeable. Ongoing activity may precipitate heatstroke.From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.
Humidity
The average relative humidity in September is 65%.Rainfall
September is the month with the most rainfall. Rain falls for 15.4 days and accumulates 2.13" (54mm) of precipitation.Snowfall
In McAllen, Texas, snow does not fall in February through December.Daylight
The average length of the day in September is 12h and 18min.On the first day of the month, sunrise is at 7:13 am and sunset at 7:52 pm. On the last day of September, in McAllen, sunrise is at 7:25 am and sunset at 7:20 pm CDT.
Sunshine
In McAllen, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September in McAllen is 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.Note: A maximum high UV index of 7 in September translates into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. 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. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
How hot is it in McAllen in September?
What is the average humidity in September in McAllen?
What is the rainiest month in McAllen?
How much does it rain in McAllen in September?
When it does not snow in McAllen?
How many hours of daylight does McAllen have in September?
When are sunrise and sunset in September in McAllen?
How long on average sun shines in September in McAllen?
What is the UV index reading in September in McAllen?
Average temperature in September
McAllen, TX
- Average high temperature in September: 92.7°F
The warmest month (with the highest average high temperature) is August (98.6°F).
The month with the lowest average high temperature is January (69.8°F).
- Average low temperature in September: 77.2°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (53.2°F).
Average pressure in September
McAllen, TX
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in September
McAllen, TX
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is May (12.6mph).
The calmest month (with the lowest average wind speed) is September (9.1mph).
Average humidity in September
McAllen, TX
- Average humidity in September: 65%
The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is August (59%).
Average rainfall in September
McAllen, TX
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is September (2.13").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
McAllen, TX
- Average rainfall days in September: 15.4 days
The month with the highest number of rainy days is September (15.4 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
McAllen, 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, November and December (0").
Average snowfall days in September
McAllen, 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
McAllen, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
McAllen, TX
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is September (12.5 days).
Average UV index in September
McAllen, TX
- Average UV index in September: 7
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
McAllen, TX
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
McAllen, 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).
McAllen, Texas, USA
Weather forecast for your location
2. Allow the app to use your location
