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's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a tropical 93.6°F (34.2°C) in August to a moderately hot 84.7°F (29.3°C). In McLean, September is marked by an average low-temperature of 65.1°F (18.4°C).Heat index
During September, the heat index is computed to be a tropical 87.8°F (31°C). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a value derived by merging air temperature with the humidity to convey how the climate feels. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Humidity
September is the most humid month in McLean, with an average relative humidity of 57%.Rainfall
In McLean, in September, it is raining for 10.6 days, with typically 1.93" (49mm) of accumulated precipitation. Throughout the year, there are 93.9 rainfall days, and 17.17" (436mm) of precipitation is accumulated.Snowfall
In McLean, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 7:15 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 7:27 pm CDT.
Sunshine
The average sunshine in September in McLean is 9.1h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
How hot is September in McLean?
What is the most humid month in McLean?
What is the average humidity in September in McLean?
How much does it rain in McLean in September?
When it does not snow in McLean?
How many hours of daylight does McLean have in September?
When is the sunrise / sunset in September in McLean?
How many hours of sunshine does McLean have in September?
What is the UV index intensity in September in McLean?
Average temperature in September
McLean, TX
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is July (94.1°F).
The month with the lowest average high temperature is December (50°F).
- Average low temperature in September: 65.1°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (32°F).
Average pressure in September
McLean, TX
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
McLean, TX
- Average wind speed in September: 10.8mph
The windiest month (with the highest average wind speed) is April (13.9mph).
The calmest month (with the lowest average wind speed) is August (10.1mph).
Average humidity in September
McLean, TX
- Average humidity in September: 57%
The month with the highest relative humidity is September (57%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
McLean, TX
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (2.56").
The driest months (with the least rainfall) are February and November (0.59").
Average rainfall days in September
McLean, TX
- Average rainfall days in September: 10.6 days
The months with the highest number of rainy days are July and August (11.3 days).
The month with the least rainy days is January (3 days).
Average snowfall in September
McLean, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
McLean, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
McLean, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
McLean, TX
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is January (25.8 days).
The month with the least sunshine days is September (16.4 days).
Average UV index in September
McLean, TX
- Average UV index in September: 5
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 2).
Average cloud cover in September
McLean, TX
- Average cloud cover in September: 22
The month with the most cloud cover is April (Cloud cover 26).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
McLean, 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).
McLean, Texas, USA
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