September weather forecastSmithfield, VA
September
Weather in September
The first month of the autumn, September, is still a warm month in Smithfield, Virginia, with an average temperature varying between 80.2°F (26.8°C) and 66.2°F (19°C).Temperature
With the onset of September, Smithfield experiences a modest temperature adjustment, with the average high-temperature gently receding from a tropical 86.2°F (30.1°C) in August to a moderately hot 80.2°F (26.8°C). Smithfield records an average nighttime low-temperature of 66.2°F (19°C) throughout September.Humidity
The average relative humidity in September is 76%.Rainfall
In Smithfield, in September, it is raining for 12.1 days, with typically 2.6" (66mm) of accumulated precipitation. Throughout the year, there are 161.5 rainfall days, and 33.9" (861mm) of precipitation is accumulated.Snowfall
In Smithfield, snow does not fall in April through October.Daylight
In Smithfield, Virginia, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:34 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:50 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index in Smithfield is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 5 in September transforms into this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Smithfield, VA
- Average high temperature in September: 80.2°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (45.5°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (32.9°F).
Average pressure in September
Smithfield, VA
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Smithfield, VA
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Smithfield, VA
- Average humidity in September: 76%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Smithfield, VA
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is August (3.31").
The driest month (with the least rainfall) is January (2.52").
Average rainfall days in September
Smithfield, VA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is November (9.8 days).
Average snowfall in September
Smithfield, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Smithfield, VA
- 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 April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Smithfield, VA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Smithfield, VA
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in September
Smithfield, VA
- Average UV index in September: 5
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Smithfield, VA
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Smithfield, VA
- 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).
