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 sea temperature 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
Yorktown's weather subtly changes with the onset of September, barely falling from 85.6°F (29.8°C) in August to a still warm 79.9°F (26.6°C). Yorktown cools down to an average low-temperature of 66.6°F (19.2°C) throughout the month of September.Humidity
In Yorktown, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall in Yorktown. Rain falls for 13 days and accumulates 2.4" (61mm) of precipitation.Snowfall
In Yorktown, Virginia, snow does not fall in April through October.Ocean temperature
In Yorktown, in September, the average water temperature is 76.3°F (24.6°C).Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.3°F (24.6°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)
Daylight
In September, the average length of the day in Yorktown is 12h and 25min.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.
Sunshine
In September, the average sunshine is 9.2h.UV index
In Yorktown, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Be vigilant - Preventing sunburn is recommended. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Enhance your sun protection with tightly woven, yet airy clothing. Be mindful! Sand and water reflections can up the Sun's UV exposure.
Frequently asked questions
What is the average September temperature in Yorktown?
What is the average humidity in September in Yorktown?
What is the driest month in Yorktown?
How much does it rain in Yorktown in September?
When it does not snow in Yorktown?
How warm is the water in September in Yorktown?
How many hours of daylight does Yorktown have in September?
What time are sunrise and sunset in September in Yorktown?
How long on average sun shines in September in Yorktown?
How high is the UV index in September in Yorktown?
Average temperature in September
Yorktown, VA
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in September: 66.6°F
The month with the highest average low temperature is July (72.3°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).
Average pressure in September
Yorktown, VA
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Yorktown, VA
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Yorktown, VA
- Average humidity in September: 75%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Yorktown, VA
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is September (2.4").
Average rainfall days in September
Yorktown, VA
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is November (9.6 days).
Average snowfall in September
Yorktown, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Yorktown, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Yorktown, VA
- Average sea temperature in September: 76.2°F
The best month for swimming (with the highest average sea temperature) is August (79.6°F).
The coldest month (with the lowest average sea temperature) is February (48.7°F).
Average daylight in September /
Average sunshine in September
Yorktown, 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 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Yorktown, VA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
Yorktown, VA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Yorktown, VA
- Average cloud cover in September: 34
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Yorktown, 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).
Yorktown, Virginia, USA
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