September weather forecastCastalian Springs, TN
September
Weather in September
The first month of the autumn, September, is still a warm month in Castalian Springs, Tennessee, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 80.1°F (26.7°C).Temperature
The transition to September results in a modest reduction in average high-temperature, moving from a warm 85.5°F (29.7°C) in August to a still moderately hot 80.1°F (26.7°C). In Castalian Springs, the September nights cool down to an average low of 61.3°F (16.3°C).Humidity
The average relative humidity in September is 77%.Rainfall
In Castalian Springs, during September, the rain falls for 14.6 days and regularly aggregates up to 2.56" (65mm) of precipitation. In Castalian Springs, Tennessee, during the entire year, the rain falls for 176.5 days and collects up to 41.22" (1047mm) of precipitation.Snowfall
May through October are months without snowfall in Castalian Springs.Daylight
In Castalian Springs, the average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 6:17 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:29 pm CDT.
Sunshine
In September, the average sunshine in Castalian Springs is 8.3h.UV index
The average daily maximum UV index in September in Castalian Springs is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: An average UV index of 5 in September transforms into this advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Castalian Springs, TN
- Average high temperature in September: 80.1°F
The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (42.8°F).
- Average low temperature in September: 61.3°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in September
Castalian Springs, 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 (29.96"Hg).
Average wind speed in September
Castalian Springs, TN
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is February (8.2mph).
The calmest month (with the lowest average wind speed) is July (4.6mph).
Average humidity in September
Castalian Springs, TN
- Average humidity in September: 77%
The months with the highest relative humidity are February, March, May, July and December (79%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Castalian Springs, TN
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is July (5.2").
The driest month (with the least rainfall) is November (2.28").
Average rainfall days in September
Castalian Springs, TN
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is November (10.3 days).
Average snowfall in September
Castalian Springs, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Castalian Springs, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.2 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
Castalian Springs, TN
- Average daylight in September: 12h and 24min
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 42min).
- Average sunshine in September: 8h and 18min
The months with the most sunshine are June and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Castalian Springs, TN
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in September
Castalian Springs, 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
Castalian Springs, TN
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility in September
Castalian Springs, TN
- Average visibility in September: 6mi
The months with the highest visibility are February, April, June, September, October, November and December (6mi).
The months with the lowest visibility are January, March, May, July and August (5mi).
