September weather forecastHolly Heights, TN
September
Weather in September
September, the first month of the autumn in Holly Heights, is also a moderately hot month, with an average temperature ranging between min 59.7°F (15.4°C) and max 81°F (27.2°C).Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a tropical 86.4°F (30.2°C) in August to a moderately hot 81°F (27.2°C). The average low-temperature of 59.7°F (15.4°C) is witnessed during September.Heat index
The average heat index in September is estimated at a hot 86°F (30°C). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.Be aware that heat index ratings are designed for shaded locations and minor breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
The months with the lowest humidity are January, June through November, with an average relative humidity of 76%.Rainfall
The month with the least rainfall in Holly Heights, Tennessee, is September, when the rain falls for 11.7 days and typically collects 1.77" (45mm) of precipitation.Snowfall
May through October are months without snowfall in Holly Heights.Daylight
In Holly Heights, the average length of the day in September is 12h and 23min.On the first day of September in Holly Heights, sunrise is at 7:13 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 7:25 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The average daily UV index of 5 in September transforms into the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Holly Heights, TN
- Average high temperature in September: 81°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (45°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in September
Holly Heights, TN
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Holly Heights, TN
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is February (6.6mph).
The calmest months (with the lowest average wind speed) are July and August (3.9mph).
Average humidity in September
Holly Heights, TN
- Average humidity in September: 76%
The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are January, June, July, August, September, October and November (76%).
Average rainfall in September
Holly Heights, TN
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is December (3.15").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in September
Holly Heights, TN
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (8.7 days).
Average snowfall in September
Holly Heights, TN
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Holly Heights, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.4 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
Holly Heights, TN
- Average daylight in September: 12h and 24min
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: 8h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Holly Heights, TN
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in September
Holly Heights, TN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Holly Heights, TN
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in September
Holly Heights, TN
- Average visibility in September: 5mi
The months with the highest visibility are June, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, July, August, September and December (5mi).
