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
With September's onset, the weather reveals a slight temperature decrease, transitioning from 82.8°F (28.2°C) in August to a still moderately hot 77.2°F (25.1°C). During September, the nighttime temperature in Quantico, Maryland, averages to a refreshing 63.1°F (17.3°C).Humidity
The months with the highest humidity are May, August and September, with an average relative humidity of 80%.Rainfall
The month with the least rainfall in Quantico is September, when the rain falls for 9.6 days and typically collects 0.71" (18mm) of precipitation.Snowfall
May through October are months without snowfall in Quantico.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:33 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
In Quantico, the average sunshine in September is 9.1h.UV index
In Quantico, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Undertake precautions - Guarding against sun damage is counselled. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
What are the temperatures in Quantico in September?
What are the most humid months in Quantico?
What is the average humidity in September in Quantico?
What is the driest month in Quantico?
How much does it rain in Quantico in September?
When it does not snow in Quantico?
How many hours of daylight does Quantico have in September?
When are sunrise and sunset in September in Quantico?
How many hours of sunshine does Quantico have in September?
What is the UV index intensity in September in Quantico?
Average temperature in September
Quantico, MD
- Average high temperature in September: 77.2°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (42.1°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (70.2°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).
Average pressure in September
Quantico, MD
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Quantico, MD
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is February (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Quantico, MD
- Average humidity in September: 80%
The months with the highest relative humidity are May, August and September (80%).
The months with the lowest relative humidity are January, February, March and April (75%).
Average rainfall in September
Quantico, MD
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is July (1.46").
The driest month (with the least rainfall) is September (0.71").
Average rainfall days in September
Quantico, MD
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is November (6.5 days).
Average snowfall in September
Quantico, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Quantico, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.2 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
Quantico, MD
- 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: 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 6min).
Average sunshine days in September
Quantico, MD
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is July (14.7 days).
Average UV index in September
Quantico, MD
- 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 and December (UV index 2).
Average cloud cover in September
Quantico, MD
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Quantico, MD
- 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).
Quantico, Maryland, USA
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