September weather forecast
Grantley, AL

Share

Weather in September

September, the first month of the autumn in Grantley, is also a moderately hot month, with an average temperature varying between 83.5°F (28.6°C) and 63.3°F (17.4°C).

Temperature

September's climate shows a minor adjustment in average high-temperatures to a warm 83.5°F (28.6°C) from August's 88.7°F (31.5°C). Throughout the nights in September, an average low-temperature of 63.3°F (17.4°C) is noted in Grantley.

Heat index

September's mean heat index is estimated at a hot 91.4°F (33°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.

Humidity

The average relative humidity in September in Grantley is 75%.

Rainfall

In September, in Grantley, the rain falls for 11.5 days. Throughout September, 1.54" (39mm) of precipitation is accumulated. Throughout the year, there are 154.5 rainfall days, and 25.04" (636mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Grantley, Alabama.

Daylight

In September, the average length of the day in Grantley is 12h and 22min.
On the first day of September, sunrise is at 6:16 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:27 pm CDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In Grantley, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily high UV index of 5 in September leads to these guidelines:
Make use of precautions - It is urged to ward off sun damage. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
[Resources]

Frequently asked questions

How hot is it in Grantley in September?

The high-temperature in Grantley, Alabama, during September is 83.5°F (28.6°C) and the low-temperature is 63.3°F (17.4°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is estimated at 91.4°F (33°C).

What is the average humidity in September in Grantley?

In Grantley, the average relative humidity in September is 75%.

How much does it rain in Grantley in September?

In Grantley, Alabama, in September, during 11.5 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

When it does not snow in Grantley?

In Grantley, Alabama, snow does not fall in April through November.

How many hours of daylight does Grantley have in September?

In September, the average day length is 12h and 22min.

When are sunrise and sunset in September in Grantley?

On the first day of September, sunrise is at 6:16 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:27 pm CDT.

How many hours of sunshine does Grantley have in September?

In Grantley, the average sunshine duration in September is 8.5h.

How high is the UV index in September in Grantley?

In Grantley, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
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
Grantley, AL

Average temperature in September - Grantley, AL
  • Average high temperature in September: 83.5°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (49.8°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (33.8°F).

[Resources]

Average pressure in September
Grantley, AL

Average pressure in September - Grantley, AL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

[Resources]

Average wind speed in September
Grantley, AL

Average wind speed in September - Grantley, AL
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is February (7.2mph).
The calmest month (with the lowest average wind speed) is August (4mph).

[Resources]

Average humidity in September
Grantley, AL

Average humidity in September - Grantley, AL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (73%).

[Resources]

Average rainfall in September
Grantley, AL

Average rainfall in September - Grantley, AL
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is August (2.56").
The driest month (with the least rainfall) is October (1.38").

[Resources]

Average rainfall days in September
Grantley, AL

Average rainfall days in September - Grantley, AL
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is November (7.9 days).

[Resources]

Average snowfall in September
Grantley, AL

Average snowfall in September - Grantley, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

[Resources]

Average snowfall days in September
Grantley, AL

Average snowfall days in September - Grantley, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Grantley, AL

Average daylight in September / Average sunshine in September - Grantley, AL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 8h and 3min

The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

[Resources]

Average sunshine days in September
Grantley, AL

Average sunshine days in September - Grantley, AL
  • Average sunshine days in September: 16.4 days

The months with the most sunshine days are October and November (20.1 days).
The month with the least sunshine days is July (8.9 days).

[Resources]

Average UV index in September
Grantley, AL

Average UV index in September - Grantley, AL
  • 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).

[Resources]

Average cloud cover in September
Grantley, AL

Average cloud cover in September - Grantley, AL
  • Average cloud cover in September: 31

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 30).

[Resources]

Average visibility in September
Grantley, AL

Average visibility in September - Grantley, AL
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).

[Resources]

Grantley, Alabama, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location