September weather forecast
Sweet Briar Park, VA

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Weather in September

The first month of the autumn, September, is still a warm month in Sweet Briar Park, Virginia, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 62.6°F (17°C).

Temperature

A minor decrease in the average high-temperature is observed during September, shifting from a hot 88.3°F (31.3°C) in August to a warm 81.3°F (27.4°C). Sweet Briar Park in September anticipates an average nighttime temperature of 62.6°F (17°C).

Heat index

For September, the heat index is calculated to be a hot 86°F (30°C). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.

Humidity

In Sweet Briar Park, the average relative humidity in September is 73%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 1.65" (42mm) of precipitation.

Snowfall

In Sweet Briar Park, snow does not fall in May through October.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:54 pm EDT.

Sunshine

In September, the average sunshine is 8.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 5 during September translates into these guidelines:
Ensure safety - Imperative it is to shield skin and eyes from damage. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In Sweet Briar Park, 81.3°F (27.4°C) is the average high-temperature and 62.6°F (17°C) is the average low-temperature during September. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, in September is calculated to be 86°F (30°C).

What is the average humidity in September?

In Sweet Briar Park, the average relative humidity in September is 73%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 1.65" (42mm) of precipitation.

How many days does it rain in September?

In Sweet Briar Park, during September, the rain falls for 12.5 days and regularly aggregates up to 1.65" (42mm) of precipitation.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Sweet Briar Park have in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:54 pm EDT.

How long on average sun shines in September?

In Sweet Briar Park, the average sunshine duration in September is 8.7h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
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
Sweet Briar Park, VA

Average temperature in September - Sweet Briar Park, VA
  • Average high temperature in September: 81.3°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (44.2°F).

  • Average low temperature in September: 62.6°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).

Average pressure in September
Sweet Briar Park, VA

Average pressure in September - Sweet Briar Park, VA
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Sweet Briar Park, VA

Average wind speed in September - Sweet Briar Park, VA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Sweet Briar Park, VA

Average humidity in September - Sweet Briar Park, VA
  • Average humidity in September: 73%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (68%).

Average rainfall in September
Sweet Briar Park, VA

Average rainfall in September - Sweet Briar Park, VA
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is September (1.65").

Average rainfall days in September
Sweet Briar Park, VA

Average rainfall days in September - Sweet Briar Park, VA
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in September
Sweet Briar Park, VA

Average snowfall in September - Sweet Briar Park, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Sweet Briar Park, VA

Average snowfall days in September - Sweet Briar Park, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Sweet Briar Park, VA

Average daylight in September / Average sunshine in September - Sweet Briar Park, 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 36min).

  • Average sunshine in September: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).

Average sunshine days in September
Sweet Briar Park, VA

Average sunshine days in September - Sweet Briar Park, VA
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.9 days).

Average UV index in September
Sweet Briar Park, VA

Average UV index in September - Sweet Briar Park, VA
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in September
Sweet Briar Park, VA

Average cloud cover in September - Sweet Briar Park, VA
  • Average cloud cover in September: 39

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Sweet Briar Park, VA

Average visibility in September - Sweet Briar Park, VA
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Sweet Briar Park, Virginia, USA

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