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
The arrival of September correlates with a minor temperature reduction, down from August's hot 92.1°F (33.4°C) to a warm 84.4°F (29.1°C). In the month of September, Allen witnesses a consistent average low-temperature of 64.6°F (18.1°C).Heat index
September's mean heat index is calculated to be a tropical 91.4°F (33°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.It is crucial to understand that heat index figures are for shade and gentle wind conditions. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Humidity
In Allen, the average relative humidity in September is 69%.Rainfall
In Allen, during September, the rain falls for 12.5 days and regularly aggregates up to 2.52" (64mm) of precipitation. Throughout the year, there are 131 rainfall days, and 28.39" (721mm) of precipitation is accumulated.Snowfall
In Allen, snow does not fall in May through October.Daylight
In Allen, the average length of the day in September is 12h and 23min.On the first day of September in Allen, sunrise is at 6:59 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:10 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September in Allen is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
How hot does it get in Allen in September?
What is the average humidity in September in Allen?
How many days does it rain in September in Allen?
When it does not snow in Allen?
How many hours of daylight does Allen have in September?
When is the sunrise / sunset in September in Allen?
How many hours of sunshine does Allen have in September?
How high is the UV index in September in Allen?
Average temperature in September
Allen, OK
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is January (48.7°F).
- Average low temperature in September: 64.6°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).
Average pressure in September
Allen, OK
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Allen, OK
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is March (11mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).
Average humidity in September
Allen, OK
- Average humidity in September: 69%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is August (64%).
Average rainfall in September
Allen, OK
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is February (1.42").
Average rainfall days in September
Allen, OK
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is January (6.7 days).
Average snowfall in September
Allen, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Allen, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Allen, OK
- 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 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Allen, OK
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (22.5 days).
The month with the least sunshine days is May (14.5 days).
Average UV index in September
Allen, OK
- 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
Allen, OK
- Average cloud cover in September: 28
The months with the most cloud cover are February and March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Allen, OK
- 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).
Allen, Oklahoma, USA
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