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
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a hot 87.4°F (30.8°C) in August to a moderately hot 81.5°F (27.5°C). During September, an average low-temperature of 62.8°F (17.1°C) is observed.Heat index
For most parts of September, the heat index is computed to be a tropical 86°F (30°C). With extended exposure and activity, one might feel exhausted and experience heat cramps.In reference to the heat index, it's for places in shade and with a slight 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 'felt air temperature' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Humidity
In September, the average relative humidity is 74%.Rainfall
In Radnor, during September, the rain falls for 13.4 days and regularly aggregates up to 2.01" (51mm) of precipitation. Throughout the year, there are 169.9 rainfall days, and 31.3" (795mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 24min.On the first day of the month, sunrise is at 6:19 am and sunset at 7:14 pm. On the last day of September, in Radnor, sunrise is at 6:41 am and sunset at 6:31 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September in Radnor is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow in Radnor?
What is the average length of the day in September?
What time 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
Radnor, TN
- Average high temperature in September: 81.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (44.1°F).
- Average low temperature in September: 62.8°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Radnor, TN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Radnor, TN
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.6mph).
Average humidity in September
Radnor, TN
- Average humidity in September: 74%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Radnor, TN
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is July (4.02").
The driest month (with the least rainfall) is November (1.77").
Average rainfall days in September
Radnor, TN
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in September
Radnor, TN
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Radnor, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.7 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
Radnor, 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 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in September
Radnor, TN
- Average sunshine days in September: 14 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (9.4 days).
Average UV index in September
Radnor, 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
Radnor, TN
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are June and August (Cloud cover 29).
Average visibility in September
Radnor, 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).
Radnor, Tennessee, USA
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