September weather forecast
King William, VA

Share

Weather in September

The first month of the autumn, September, is still a warm month in King William, Virginia, with an average temperature varying between 80.6°F (27°C) and 62.8°F (17.1°C).

Temperature

King William's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's hot 87.4°F (30.8°C) to a moderately hot 80.6°F (27°C). King William experiences an average nighttime temperature of 62.8°F (17.1°C) in the month of September.

Heat index

The heat index in September is appraised at 84.2°F (29°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.
Research indicates the heat index considers values in shaded locales and with light winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.

Humidity

In September, the average relative humidity is 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.9 days and accumulates 1.77" (45mm) of precipitation.

Snowfall

In King William, snow does not fall in May through October.

Daylight

In King William, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

Sunshine

In King William, the average sunshine in September is 8.8h.

UV index

In King William, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 5 in September translates into these instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Jul 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

The high-temperature, in September, in King William, is 80.6°F (27°C), while the low-temperature averages to 62.8°F (17.1°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 84.2°F (29°C).

What is the average humidity in September?

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

What is the driest month in King William?

The month with the least rainfall is September, when the rain falls for 11.9 days and typically collects 1.77" (45mm) of precipitation.

How much does it rain in September?

In King William, during September, the rain falls for 11.9 days and regularly aggregates up to 1.77" (45mm) of precipitation.

When it does not snow in King William?

In King William, snow does not fall in May through October.

What is the average length of the day in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

How many hours of sunshine does King William have in September?

In King William, the average sunshine duration in September is 8.8h.

How high is the UV index in September?

In King William, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe 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
King William, VA

Average temperature in September - King William, VA
  • Average high temperature in September: 80.6°F

The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (44.2°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).

Average pressure in September
King William, VA

Average pressure in September - King William, 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
King William, VA

Average wind speed in September - King William, VA
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in September
King William, VA

Average humidity in September - King William, VA
  • Average humidity in September: 76%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is July (71%).

Average rainfall in September
King William, VA

Average rainfall in September - King William, VA
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is August (2.99").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in September
King William, VA

Average rainfall days in September - King William, VA
  • Average rainfall days in September: 11.9 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (9.8 days).

Average snowfall in September
King William, VA

Average snowfall in September - King William, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
King William, VA

Average snowfall days in September - King William, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.9 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
King William, VA

Average daylight in September / Average sunshine in September - King William, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 5h and 18min).

Average sunshine days in September
King William, VA

Average sunshine days in September - King William, VA
  • Average sunshine days in September: 16.7 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September
King William, VA

Average UV index in September - King William, 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 and December (UV index 2).

Average cloud cover in September
King William, VA

Average cloud cover in September - King William, VA
  • Average cloud cover in September: 38

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in September
King William, VA

Average visibility in September - King William, VA
  • Average visibility in September: 6mi

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

King William, Virginia, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location