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
In the transition from August to September, Wilmer reports an average high-temperature of a still hot 87.3°F (30.7°C), indicating a close resemblance to the prior month. In Wilmer, an average nighttime temperature of 72.5°F (22.5°C) is expected during September.Heat index
September's heat index is estimated at a very hot 100.4°F (38°C). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.
Humidity
In Wilmer, the average relative humidity in September is 74%.Rainfall
In Wilmer, Alabama, during September, the rain falls for 18.8 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, in Wilmer, there are 168.3 rainfall days, and 30.28" (769mm) of precipitation is accumulated.Snowfall
February through December are months without snowfall in Wilmer.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:16 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:39 pm CDT.
Sunshine
The average sunshine in September is 9.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 6 in September translates into this advice:
Prevent overexposure. Protection from the sun's harmful effects is needed. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
How hot is it in Wilmer in September?
What is the average humidity in September in Wilmer?
How many days does it rain in September in Wilmer?
When it does not snow in Wilmer?
What is the average length of the day in September in Wilmer?
What time are sunrise and sunset in September in Wilmer?
How long on average sun shines in September in Wilmer?
What is the UV index intensity in September in Wilmer?
Average temperature in September
Wilmer, AL
- Average high temperature in September: 87.3°F
The warmest months (with the highest average high temperature) are July and August (90.5°F).
The month with the lowest average high temperature is January (58.5°F).
- Average low temperature in September: 72.5°F
The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (43.9°F).
Average pressure in September
Wilmer, AL
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed in September
Wilmer, AL
- Average wind speed in September: 5.6mph
The windiest months (with the highest average wind speed) are January, February, March, April and December (7.3mph).
The calmest month (with the lowest average wind speed) is July (5.1mph).
Average humidity in September
Wilmer, AL
- Average humidity in September: 74%
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Wilmer, AL
- Average rainfall in September: 3.03"
The wettest month (with the highest rainfall) is August (4.92").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in September
Wilmer, AL
- Average rainfall days in September: 18.8 days
The month with the highest number of rainy days is July (24.6 days).
The month with the least rainy days is November (7.2 days).
Average snowfall in September
Wilmer, AL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.16").
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
Wilmer, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 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
Wilmer, 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 4min
The month with the most sunshine is June (Average sunshine: 11h and 6min).
The months with the least sunshine are February and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Wilmer, AL
- Average sunshine days in September: 9.3 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (4.8 days).
Average UV index in September
Wilmer, 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 and December (UV index 3).
Average cloud cover in September
Wilmer, AL
- Average cloud cover in September: 26
The months with the most cloud cover are February and December (Cloud cover 43).
The month with the least cloud cover is October (Cloud cover 23).
Average visibility in September
Wilmer, 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).
Wilmer, Alabama, USA
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