September weather forecast and climate
Washington, NC

September, the first month of the autumn, in Washington, is also a moderately hot month, with average temperature ranging between max 82°F (27.8°C) and min 65.3°F (18.5°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 87.4°F (30.8°C) in August, to a warm 82°F (27.8°C). In Washington, North Carolina, the average low-temperature is 65.3°F (18.5°C).

Heat index

The average heat index is calculated to a tropical 88.9°F (31.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

Months with the highest humidity are August, September and December, with an average relative humidity of 80%.

Rainfall

In Washington, during 14.6 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. In Washington, during the entire year, the rain falls for 169 days and collects up to 36.1" (917mm) of precipitation.

Snowfall

In Washington snow does not fall in April through October.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In Washington, the average sunshine in September is 9h.

UV index

In Washington, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Washington?

In Washington, in September, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 65.3°F (18.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines air temperature and relative humidity, in September is appraised at 88.9°F (31.6°C).

What are the most humid months in Washington?

August, September and December, with an average relative humidity of 80%, are most humid months.

What is the average humidity in September in Washington?

The average relative humidity in September in Washington, North Carolina, is 80%.

How many days does it rain in September in Washington?

In Washington, in September, during 14.6 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

When it does not snow in Washington?

In Washington, North Carolina, snow does not fall in April through October.

What is the average length of the day in September in Washington?

In September, the average length of the day in Washington is 12.4h.

How many hours of sunshine does Washington have in September?

The average sunshine in September is 9h.

How high is the UV index in September in Washington?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Washington, NC
  • Average high temperature in September: 82°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (49.6°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).

Average pressure in September - Washington, NC
  • Average pressure in September: 30.02"

Months with the highest atmospheric pressure are November and December (30.13").
The month with the lowest atmospheric pressure is June (29.96").

Average wind speed in September - Washington, NC
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September - Washington, NC
  • Average humidity in September: 80%

Months with the highest relative humidity are August, September and December (80%).
Months with the lowest relative humidity are January and April (76%).

Average rainfall in September - Washington, NC
  • Average rainfall in September: 3.31"

The wettest month (with the highest rainfall) is August (4.17").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in September - Washington, NC
  • Average rainfall days in September: 14.6 days

The month with the highest number of rainy days is July (20.3 days).
The month with the least rainy days is November (9.1 days).

Average snowfall in September - Washington, NC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.1").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Washington, NC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.6 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Washington, NC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 9h

Months with the most sunshine are June and July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 5.3h).

Average sunshine days in September - Washington, NC
  • Average sunshine days in September: 13.2 days

The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is July (7.8 days).

Average UV index in September - Washington, NC
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).

Average cloud cover in September - Washington, NC
  • Average cloud cover in September: 40

The month with the most cloud cover is March (Cloud cover 44).
Months with the least cloud cover are June and October (Cloud cover 35).

Average visibility in September - Washington, NC
  • Average visibility in September: 5mi

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