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 commencement is accompanied by an average high-temperature of a still hot 86°F (30°C), diverging marginally from August's 89.1°F (31.7°C). In Summerdale, the September nights cool down to an average low of 74.5°F (23.6°C).Heat index
The heat index value during September is calculated to be a very hot 96.8°F (36°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.Heat index's context suggests values are appropriate for shady areas and slight breezes. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', binds temperature metrics with humidity values to give a sense of the actual warmth. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. 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 heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
Humidity
In September, the average relative humidity is 74%.Rainfall
In Summerdale, during September, the rain falls for 13.4 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 130.4 rainfall days, and 13.7" (348mm) of precipitation is accumulated.Snowfall
February through December are months without snowfall.Daylight
In Summerdale, the average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 6:27 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:36 pm CDT.
Sunshine
The average sunshine in September is 9.8h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 6 suggests this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Summerdale, AL
- Average high temperature in September: 86°F
The warmest month (with the highest average high temperature) is August (89.1°F).
The month with the lowest average high temperature is January (59.2°F).
- Average low temperature in September: 74.5°F
The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is January (46.4°F).
Average pressure in September
Summerdale, AL
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.97"Hg).
Average wind speed in September
Summerdale, AL
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Summerdale, AL
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Summerdale, AL
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is August (1.89").
The driest month (with the least rainfall) is May (0.59").
Average rainfall days in September
Summerdale, AL
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (6.8 days).
Average snowfall in September
Summerdale, AL
- 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
Summerdale, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Summerdale, AL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 5min
The months with the most sunshine are May and June (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Summerdale, AL
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (8.1 days).
Average UV index in September
Summerdale, AL
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 4).
Average cloud cover in September
Summerdale, AL
- Average cloud cover in September: 24
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 22).
Average visibility in September
Summerdale, AL
- 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).
Summerdale, Alabama, USA
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