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 shift into September finds Bethesda at an average high-temperature of a moderately hot 81.3°F (27.4°C), closely comparable to August's conditions. Bethesda's September nights cool down to an average low-temperature of 61.9°F (16.6°C).Heat index
The average heat index in September is calculated to be a hot 86°F (30°C). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.Given the heat index, its values are aligned with shaded sites and gentle winds. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
Humidity
In Bethesda, the average relative humidity in September is 76%.Rainfall
In Bethesda, Tennessee, in September, it is raining for 11.3 days, with typically 0.98" (25mm) of accumulated precipitation. Throughout the year, there are 141.9 rainfall days, and 17.32" (440mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Bethesda.Daylight
The average length of the day in September in Bethesda is 12h and 23min.On the first day of September, sunrise is at 6:19 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:31 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 5 in September transforms into the following instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What is the temperature in September in Bethesda?
What is the average humidity in September in Bethesda?
How much does it rain in Bethesda in September?
When it does not snow in Bethesda?
What is the average length of the day in September in Bethesda?
When are sunrise and sunset in September in Bethesda?
How many hours of sunshine does Bethesda have in September?
What is the UV index reading in September in Bethesda?
Average temperature in September
Bethesda, TN
- Average high temperature in September: 81.3°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (45.3°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.9°F).
Average pressure in September
Bethesda, 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
Bethesda, TN
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.6mph).
Average humidity in September
Bethesda, TN
- Average humidity in September: 76%
The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Bethesda, TN
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is July (2.17").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in September
Bethesda, TN
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is November (7.2 days).
Average snowfall in September
Bethesda, TN
- Average snowfall in September: 0"
The months with the highest snowfall are February and December (0.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Bethesda, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 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
Bethesda, 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: 8h and 4min
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
Bethesda, TN
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Bethesda, 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
Bethesda, TN
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in September
Bethesda, TN
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Bethesda, Tennessee, USA
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