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
September
Weather in September
Temperature
Entering September, the average high-temperature is recorded at a still warm 77.5°F (25.3°C), exhibiting a minimal shift from August's 82.6°F (28.1°C). Johnson City reports a marked divergence from daytime peaks throughout September, with lows averaging at a cool 54.9°F (12.7°C).Humidity
In Johnson City, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 15.5 days and accumulates 1.77" (45mm) of precipitation.Snowfall
May through September are months without snowfall in Johnson City.Daylight
In Johnson City, the average length of the day in September is 12h and 24min.On the first day of September, sunrise is at 7:01 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:13 pm EDT.
Sunshine
In Johnson City, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
What is the driest month?
How much does it rain in Johnson City in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Johnson City have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Johnson City have in September?
How high is the UV index in September?
Average temperature in September
Johnson City, TN
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure in September
Johnson City, TN
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in September
Johnson City, TN
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Johnson City, TN
- Average humidity in September: 77%
The months with the highest relative humidity are February and December (79%).
The month with the lowest relative humidity is November (75%).
Average rainfall in September
Johnson City, TN
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is February (3.27").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in September
Johnson City, TN
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (11.2 days).
Average snowfall in September
Johnson City, TN
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Johnson City, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Johnson City, 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 42min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Johnson City, TN
- Average sunshine days in September: 11.9 days
The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is July (8.3 days).
Average UV index in September
Johnson City, TN
- Average UV index in September: 4
The months with the highest UV index are 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
Johnson City, TN
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are June and August (Cloud cover 31).
Average visibility in September
Johnson City, TN
- Average visibility in September: 5mi
The months with the highest visibility are April, June, July, October and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September and December (5mi).