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 arrival of September signals a subtle shift in temperature, down from a tropical 88.5°F (31.4°C) in August to a warm 83.1°F (28.4°C). September brings with it a nighttime average temperature of 62.8°F (17.1°C).Heat index
For September, the heat index is calculated to be a tropical 89.6°F (32°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.Observations indicate that the heat index values are for shady locations with light wind. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a composite of temperature and humidity figures to convey how warm it feels. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
In Chesterfield, the average relative humidity in September is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 10 days and typically collects 0.94" (24mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In Chesterfield, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:25 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:37 pm CDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Prioritize safety - Recommendations to avert sunburn are shared. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
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 Chesterfield have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Chesterfield, TN
- Average high temperature in September: 83.1°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (45.5°F).
- Average low temperature in September: 62.8°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 (31.6°F).
Average pressure in September
Chesterfield, 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
Chesterfield, TN
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (8.2mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Chesterfield, 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
Chesterfield, TN
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is February (1.97").
The driest month (with the least rainfall) is September (0.94").
Average rainfall days in September
Chesterfield, TN
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.7 days).
Average snowfall in September
Chesterfield, TN
- Average snowfall in September: 0"
The month with the highest snowfall is November (0.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Chesterfield, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Chesterfield, 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 1min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Chesterfield, TN
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is July (12.4 days).
Average UV index in September
Chesterfield, TN
- Average UV index in September: 5
The month with the highest UV index is June (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Chesterfield, TN
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Chesterfield, 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).
Chesterfield, Tennessee, USA
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