September weather forecast
Quantico, VA

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Weather in September

As the summer starts to ebb, September experiences a slight drop in maximum temperature to 79.3°F (26.3°C). It's a cooler crescendo that bridges the gap between the sweltering summer months and the approaching autumn. The city transitions slowly, shedding its vibrant summer colours and gradually moving into a more muted palette. The evident increase in cloud cover hints at the cooler weather to come. The subtle shift in temperature and atmosphere indicates the imminent arrival of the fall season.

Temperature

September brings a minor shift in the average high-temperature in Quantico, adjusting from a hot 86.2°F (30.1°C) in August to a moderately hot 79.3°F (26.3°C). During the month of September, Quantico experiences a steady low-temperature average of 61°F (16.1°C).

Humidity

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

Rainfall

In Quantico, Virginia, during September, the rain falls for 11.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, in Quantico, Virginia, there are 155.6 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Quantico.

Daylight

The average length of the day in September in Quantico, Virginia, is 12h and 25min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of September, in Quantico, sunrise is at 7:04 am and sunset at 6:53 pm EDT.

Sunshine

The average sunshine in September in Quantico is 8.6h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Around midday, solar radiation is most harmful; hence, exposure should be limited. During bright days, sunglasses that offer UVA and UVB defense are recommended.
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Frequently asked questions

What is the average September temperature in Quantico?

In September, in Quantico, the average high-temperature is 79.3°F (26.3°C), and the average low-temperature is 61°F (16.1°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is calculated to be 98.6°F (37°C).

What is the average humidity in September in Quantico?

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

How many days does it rain in September in Quantico?

In September, in Quantico, the rain falls for 11.5 days. Throughout September, 2.05" (52mm) of precipitation is accumulated.

When it does not snow in Quantico?

In Quantico, snow does not fall in May through October.

How many hours of daylight does Quantico have in September?

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

When is the sunrise / sunset in September in Quantico?

On the first day of September in Quantico, Virginia, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:53 pm EDT.

How many hours of sunshine does Quantico have in September?

In Quantico, the average sunshine duration in September is 8.6h.

What is the UV index intensity in September in Quantico?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to 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
Quantico, VA

Average temperature in September - Quantico, VA
  • Average high temperature in September: 79.3°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in September: 61°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

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Average pressure in September
Quantico, VA

Average pressure in September - Quantico, VA
  • Average pressure in September: 30.05"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).

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Average wind speed in September
Quantico, VA

Average wind speed in September - Quantico, VA
  • Average wind speed in September: 5.3mph

The windiest months (with the highest average wind speed) are March and April (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in September
Quantico, VA

Average humidity in September - Quantico, VA
  • Average humidity in September: 76%

The months with the highest relative humidity are October and December (78%).
The months with the lowest relative humidity are January, April and July (73%).

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Average rainfall in September
Quantico, VA

Average rainfall in September - Quantico, VA
  • Average rainfall in September: 2.05"

The wettest month (with the highest rainfall) is August (3.66").
The driest month (with the least rainfall) is January (1.97").

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Average rainfall days in September
Quantico, VA

Average rainfall days in September - Quantico, VA
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is November (8.7 days).

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Average snowfall in September
Quantico, VA

Average snowfall in September - Quantico, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.52").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Quantico, VA

Average snowfall days in September - Quantico, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Quantico, VA

Average daylight in September / Average sunshine in September - Quantico, VA
  • 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).

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Average sunshine days in September
Quantico, VA

Average sunshine days in September - Quantico, VA
  • Average sunshine days in September: 17.2 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in September
Quantico, VA

Average UV index in September - Quantico, VA
  • 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).

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Average cloud cover in September
Quantico, VA

Average cloud cover in September - Quantico, 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 32).

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Average visibility in September
Quantico, VA

Average visibility in September - Quantico, VA
  • Average visibility in September: 5mi

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

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Quantico, Virginia, USA

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