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
In Black Rock, the average high-temperature in September gently drops from a hot 87.8°F (31°C) in August to a warm 82°F (27.8°C). During September, the temperature is averaged to a low of 63.7°F (17.6°C) at night.Heat index
Throughout September, the heat index is appraised at a hot 87.8°F (31°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
In Black Rock, the average relative humidity in September is 72%.Rainfall
September is the month with the least rainfall in Black Rock. Rain falls for 11 days and accumulates 2.2" (56mm) of precipitation.Snowfall
In Black Rock, snow does not fall in April through September.Daylight
In September, the average length of the day in Black Rock is 12h and 23min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:48 pm CDT.
Sunshine
The average sunshine in September is 9.6h.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 unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Ensure safety - Sun damage prevention is strongly urged. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What is the usual temperature for Black Rock in September?
What is the average humidity in September in Black Rock?
What is the driest month in Black Rock?
How much does it rain in Black Rock in September?
When it does not snow in Black Rock?
Does it snow in Black Rock in September?
What is the average length of the day in September in Black Rock?
When are sunrise and sunset in September in Black Rock?
How long on average sun shines in September in Black Rock?
What is the UV index reading in September in Black Rock?
Average temperature in September
Black Rock, AR
- Average high temperature in September: 82°F
The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in September: 63.7°F
The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).
Average pressure in September
Black Rock, AR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Black Rock, AR
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is February (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Black Rock, AR
- Average humidity in September: 72%
The month with the highest relative humidity is March (78%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Black Rock, AR
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is April (4.61").
The driest month (with the least rainfall) is September (2.2").
Average rainfall days in September
Black Rock, AR
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in September
Black Rock, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.18").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in September
Black Rock, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.7 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
Black Rock, AR
- 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: 9h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Black Rock, AR
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is October (19.8 days).
The months with the least sunshine days are April and May (13.8 days).
Average UV index in September
Black Rock, AR
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Black Rock, AR
- Average cloud cover in September: 28
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in September
Black Rock, AR
- 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).
Black Rock, Arkansas, USA
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