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
Grayson experiences a subtle adjustment in high-temperatures to a still warm 74.3°F (23.5°C) with the onset of September, maintaining near parity with August's 79.5°F (26.4°C). Throughout September nights, Grayson registers an average low-temperature of 53.1°F (11.7°C).Humidity
The average relative humidity in September is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 14.2 days and accumulates 1.57" (40mm) of precipitation.Snowfall
In Grayson, snow does not fall in June through September.Daylight
In Grayson, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:11 pm EDT.
Sunshine
In Grayson, the average sunshine in September is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during September leads to these advisories:
Take necessary precautions - Suggestions to elude sunburn are provided. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the driest month in Grayson?
How many days does it rain in September?
When it does not snow?
Does it snow in Grayson in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Grayson have in September?
What is the UV index intensity in September?
Average temperature in September
Grayson, NC
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 53.1°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Grayson, NC
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in September
Grayson, NC
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Grayson, NC
- Average humidity in September: 79%
The months with the highest relative humidity are February, March and December (80%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Grayson, NC
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is February (3.31").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in September
Grayson, NC
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is November (10.1 days).
Average snowfall in September
Grayson, NC
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.5").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grayson, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grayson, NC
- 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 42min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Grayson, NC
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is February (8.9 days).
Average UV index in September
Grayson, NC
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Grayson, NC
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are June, July and August (Cloud cover 37).
Average visibility in September
Grayson, NC
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Grayson, North Carolina, USA
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