September weather forecast and climate
Grayson, GA

The first month of the autumn, September, is also a moderately hot month in Grayson, Georgia, with temperature in the range of an average low of 65.1°F (18.4°C) and an average high of 84°F (28.9°C).

Temperature

In Grayson, the average high-temperature is essentially the same as in August - a warm 84°F (28.9°C). In September, the average low-temperature is 65.1°F (18.4°C).

Heat index

In September, the average heat index is estimated at a hot 90.9°F (32.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like clothing, pregnancy, metabolic differences, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In September, the average relative humidity is 71%.

Rainfall

In Grayson, Georgia, it is raining for 11.5 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 158.9 rainfall days, and 27.32" (694mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Grayson, Georgia.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

The average sunshine in Grayson is 8.6h.

UV index

In September, the average daily maximum UV index in Grayson is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Grayson?

In Grayson, Georgia, in September, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 65.1°F (18.4°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines air temperature and relative humidity, is estimated at 90.9°F (32.7°C).

What is the average humidity in September in Grayson?

In September, the average relative humidity is 71%.

How much does it rain in Grayson in September?

In Grayson, Georgia, in September, it is raining for 11.5 days, with typically 1.54" (39mm) of accumulated precipitation.

When it does not snow in Grayson?

In Grayson, Georgia, snow does not fall in April through October.

What is the average length of the day in September in Grayson?

In September, the average length of the day in Grayson is 12.4h.

How many hours of sunshine does Grayson have in September?

The average sunshine in September in Grayson, Georgia, is 8.6h.

How high is the UV index in September in Grayson?

In Grayson, Georgia, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Grayson, GA
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (49.8°F).

  • Average low temperature in September: 65.1°F

The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (34.9°F).

Average pressure in September - Grayson, GA
  • Average pressure in September: 30.03"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.99").

Average wind speed in September - Grayson, GA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in September - Grayson, GA
  • Average humidity in September: 71%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is July (70%).

Average rainfall in September - Grayson, GA
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is October (1.46").

Average rainfall days in September - Grayson, GA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is July (18.8 days).
Months with the least rainy days are October and November (9.4 days).

Average snowfall in September - Grayson, GA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.43").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Grayson, GA
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and February (0.8 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Grayson, GA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 8.6h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 5h).

Average sunshine days in September - Grayson, GA
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is October (21.1 days).
The month with the least sunshine days is July (9.8 days).

Average UV index in September - Grayson, GA
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in September - Grayson, GA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 30).

Average visibility in September - Grayson, GA
  • Average visibility in September: 6mi

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