September weather forecast
Black Rock, AR

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Weather in September

September, the first month of the autumn in Black Rock, is also a moderately hot month, with an average temperature varying between 63.7°F (17.6°C) and 82°F (27.8°C).

Temperature

The arrival of September is marked by a minor reduction in average high-temperature, sliding from a tropical 87.8°F (31°C) in August to a moderately hot 82°F (27.8°C). An average low-temperature of 63.7°F (17.6°C) marks the nights throughout September.

Heat index

September's mean heat index is computed to be a hot 87.8°F (31°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.
Data suggests that the heat index is set for environments in shade and with a light wind. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.

Humidity

In September, the average relative humidity is 72%.

Rainfall

The month with the least rainfall is September, when the rain falls for 11 days and typically collects 2.2" (56mm) of precipitation.

Snowfall

In Black Rock, snow does not fall in April through September.

Daylight

The average length of the day in September is 12h and 23min.
On the first day of September in Black Rock, sunrise is at 6:36 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:48 pm CDT.

Sunshine

In September, the average sunshine is 9.6h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 5 in September translates into these instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Updated: Aug 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

In Black Rock, in September, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 63.7°F (17.6°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 72%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 11 days and accumulates 2.2" (56mm) of precipitation.

How much does it rain in September?

In Black Rock, Arkansas, in September, during 11 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

When it does not snow?

April through September are months without snowfall.

Does it snow in September?

In Black Rock, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Black Rock have in September?

In Black Rock, the average day length in September is 12h and 23min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:36 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:48 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.6h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Black Rock, AR

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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