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 September, the average high-temperature marginally drops from a warm 85.6°F (29.8°C) in August to a still moderately hot 79.3°F (26.3°C). From the height of daytime heat, the temperature in Grayson, Kentucky, recedes to an average of 57.4°F (14.1°C) at night during September.Humidity
In September, the average relative humidity in Grayson is 75%.Rainfall
September is the month with the least rainfall in Grayson. Rain falls for 12.5 days and accumulates 1.89" (48mm) of precipitation.Snowfall
In Grayson, snow does not fall in May through September.Daylight
In September, the average length of the day in Grayson is 12h and 25min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:01 pm. On the last day of September, in Grayson, sunrise is at 7:27 am and sunset at 7:15 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
The average daily maximum UV index in September in Grayson is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 5 during September leads to these instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Around midday, solar radiation is most harmful; hence, exposure should be limited. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Grayson?
What is the average humidity in September in Grayson?
What is the driest month in Grayson?
How many days does it rain in September in Grayson?
When it does not snow in Grayson?
Does it snow in Grayson in September?
How many hours of daylight does Grayson have in September?
When are sunrise and sunset in September in Grayson?
How long on average sun shines in September in Grayson?
What is the UV index intensity in September in Grayson?
Average temperature in September
Grayson, KY
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Grayson, KY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Grayson, KY
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in September
Grayson, KY
- Average humidity in September: 75%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Grayson, KY
- Average rainfall in September: 1.89"
The wettest months (with the highest rainfall) are April and December (3.07").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Grayson, KY
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in September
Grayson, KY
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Grayson, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.1 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
Grayson, KY
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Grayson, KY
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in September
Grayson, KY
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grayson, KY
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Grayson, KY
- Average visibility in September: 5mi
The months with the highest visibility are April, June, October and November (6mi).
The months with the lowest visibility are January, February, March, May, July, August, September and December (5mi).
Grayson, Kentucky, USA
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