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
Mercer's September average high-temperature settles at a moderately hot 82.9°F (28.3°C), showing a near match with the preceding month. Mercer's nights in September cool down to an average low-temperature of 63.5°F (17.5°C).Heat index
The heat index value during September is appraised at a hot 89.6°F (32°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.Heat index readings emphasize conditions of light breezes and shaded spots. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
In September, the average relative humidity in Mercer is 73%.Rainfall
The month with the least rainfall is September, when the rain falls for 8.9 days and typically collects 0.67" (17mm) of precipitation.Snowfall
April through October are months without snowfall in Mercer, Tennessee.Daylight
The average length of the day in September in Mercer is 12h and 23min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:22 pm. On the last day of September, in Mercer, sunrise is at 6:50 am and sunset at 6:40 pm CDT.
Sunshine
The average sunshine in September in Mercer is 9.4h.UV index
In Mercer, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Mercer?
What is the average humidity in September in Mercer?
What is the driest month in Mercer?
How much does it rain in Mercer in September?
When it does not snow in Mercer?
How many hours of daylight does Mercer have in September?
When is the sunrise / sunset in September in Mercer?
How long on average sun shines in September in Mercer?
What is the UV index reading in September in Mercer?
Average temperature in September
Mercer, TN
- Average high temperature in September: 82.9°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (45.7°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (32°F).
Average pressure in September
Mercer, TN
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Mercer, TN
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is February (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).
Average humidity in September
Mercer, TN
- Average humidity in September: 73%
The month with the highest relative humidity is March (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Mercer, TN
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is July (1.85").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in September
Mercer, TN
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is November (7.1 days).
Average snowfall in September
Mercer, TN
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Mercer, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Mercer, TN
- 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 2min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Mercer, TN
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (13.8 days).
Average UV index in September
Mercer, TN
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Mercer, TN
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 26).
Average visibility in September
Mercer, TN
- 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).
Mercer, Tennessee, USA
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