September weather forecast
Smithfield, VA

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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.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

In Smithfield, 80.2°F (26.8°C) is the average high-temperature and 66.2°F (19°C) is the average low-temperature during September. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 96.8°F (36°C).

What is the average humidity in September?

In Smithfield, the average relative humidity in September is 76%.

How many days does it rain in September?

In September, the rain falls for 12.1 days. Throughout September, 2.6" (66mm) of precipitation is accumulated.

When it does not snow?

In Smithfield, snow does not fall in April through October.

What is the average length of the day in September?

The average day length in September is 12h and 25min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:37 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

How many hours of sunshine does Smithfield have in September?

In Smithfield, Virginia, the average sunshine duration in September is 9.1h.

What is the UV index intensity in September in Smithfield?

In Smithfield, Virginia, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
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
Smithfield, VA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Smithfield, VA
  • Average daylight in September: 12h and 2min

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 1min

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 - 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 - 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 - 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 - 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).

Smithfield, Virginia, USA

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