September weather forecast
Chelsea, VA

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Weather in September

September, the first month of the autumn in Chelsea, is also a moderately hot month, with an average temperature fluctuating between 81.3°F (27.4°C) and 62.6°F (17°C).

Temperature

The commencement of September indicates a gentle shift in the average high-temperature, receding from August's hot 88.3°F (31.3°C) to a moderately hot 81.3°F (27.4°C). Chelsea sees an average low-temperature of 62.6°F (17°C) during September.

Heat index

During September, the heat index is computed to be a tropical 86°F (30°C). Continuing activity during long-lasting exposure might induce tiredness and result in heat cramps.
Heat index specifics point out values are for conditions of shade and a slight breeze. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.

Humidity

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 Chelsea, snow does not fall in May through October.

Daylight

The average length of the day in September in Chelsea is 12h and 25min.
On the first day of September, sunrise is at 6:42 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:55 pm EDT.

Sunshine

In Chelsea, the average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Updated: Jul 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

Chelsea in September has an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 62.6°F (17°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 86°F (30°C).

What is the average humidity in September?

In Chelsea, 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 much does it rain in September?

In September, the rain falls for 12.5 days. Throughout September, 1.65" (42mm) of precipitation is accumulated.

When it does not snow?

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

How many hours of daylight does Chelsea have in September?

In September, the average day length is 12h and 25min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:42 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:55 pm EDT.

How many hours of sunshine does Chelsea have in September?

The average sunshine duration in September is 8.7h.

How high is the UV index in September in Chelsea?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
Chelsea, VA

Average temperature in September - Chelsea, 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
Chelsea, VA

Average pressure in September - Chelsea, 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
Chelsea, VA

Average wind speed in September - Chelsea, 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
Chelsea, VA

Average humidity in September - Chelsea, 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
Chelsea, VA

Average rainfall in September - Chelsea, 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
Chelsea, VA

Average rainfall days in September - Chelsea, 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
Chelsea, VA

Average snowfall in September - Chelsea, 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
Chelsea, VA

Average snowfall days in September - Chelsea, 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
Chelsea, VA

Average daylight in September / Average sunshine in September - Chelsea, 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
Chelsea, VA

Average sunshine days in September - Chelsea, 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
Chelsea, VA

Average UV index in September - Chelsea, 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
Chelsea, VA

Average cloud cover in September - Chelsea, 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
Chelsea, VA

Average visibility in September - Chelsea, 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).

Chelsea, Virginia, USA

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