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 transition into September is accompanied by a slight temperature decrease, with the average high-temperature shifting from a hot 88.3°F (31.3°C) in August to a moderately hot 82.8°F (28.2°C). The average temperature during September nights is registered at a comfortable 62.4°F (16.9°C).Heat index
During September, the heat index is estimated at a hot 89.6°F (32°C). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.Heat index evaluations are typically in the context of light winds and shaded environments. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Humidity
In McIllwain, the average relative humidity in September is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 8 days and typically collects 0.35" (9mm) of precipitation.Snowfall
In McIllwain, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:24 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:36 pm CDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in McIllwain?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does McIllwain have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does McIllwain have in September?
How high is the UV index in September?
Average temperature in September
McIllwain, TN
- Average high temperature in September: 82.8°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (45°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (30.7°F).
Average pressure in September
McIllwain, TN
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
McIllwain, TN
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January, February and April (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in September
McIllwain, TN
- Average humidity in September: 74%
The months with the highest relative humidity are March and December (79%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
McIllwain, TN
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is July (1.5").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in September
McIllwain, TN
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is November (6.1 days).
Average snowfall in September
McIllwain, TN
- Average snowfall in September: 0"
The month with the highest snowfall is March (0.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
McIllwain, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.9 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
McIllwain, TN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
McIllwain, TN
- Average sunshine days in September: 20.7 days
The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is July (15.7 days).
Average UV index in September
McIllwain, TN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
McIllwain, TN
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
McIllwain, TN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
The months with the lowest visibility are May, July and August (5mi).
McIllwain, Tennessee, USA
Weather forecast for your location
2. Allow the app to use your location