September weather forecast and climate
Richmond, VA

River James in Richmond, Virginia overlooking the lit city buildings at dusk
River James in Richmond, Virginia overlooking the lit city buildings at dusk

Weather in September

September, the first month of the autumn, in Richmond, is also a moderately hot month, with average temperature varying between 81.3°F (27.4°C) and 63.1°F (17.3°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 88.3°F (31.3°C) in August, to a warm 81.3°F (27.4°C). The average low-temperature, in September, is 63.1°F (17.3°C).

Heat index

The average heat index is evaluated at 85.8°F (29.9°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 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like differences in body mass, height, and shape, pregnancy, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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

The average relative humidity in Richmond is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 11.2 days and accumulates 1.73" (44mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine in Richmond, Virginia, is 8.6h.

UV index

The average daily maximum UV index in Richmond, Virginia, is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
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FAQ

What is the temperature in September in Richmond?

In September, the average high-temperature is 81.3°F (27.4°C), and the average low-temperature is 63.1°F (17.3°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines air temperature and relative humidity, is estimated at 85.8°F (29.9°C).

What is the average humidity in September in Richmond?

In Richmond, the average relative humidity in September is 73%.

How much does it rain in Richmond in September?

In Richmond, in September, it is raining for 11.2 days, with typically 1.73" (44mm) of accumulated precipitation.

What is the driest month in Richmond?

The month with the least rainfall in Richmond, Virginia, is September when the rain falls for 11.2 days and typically collects 1.73" (44mm) of precipitation.

When it does not snow in Richmond?

In Richmond snow does not fall in May through October.

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

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

How long on average sun shines in September in Richmond?

In September, the average sunshine in Richmond, Virginia, is 8.6h.

What is the UV index intensity in September in Richmond?

The average daily maximum UV index in September in Richmond is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Richmond, VA

Average temperature in September - Richmond, VA
  • Average high temperature in September: 81.3°F

The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (44.6°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 (29.7°F).

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Average pressure in September
Richmond, VA

Average pressure in September - Richmond, VA
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

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Average wind speed in September
Richmond, VA

Average wind speed in September - Richmond, VA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in September
Richmond, VA

Average humidity in September - Richmond, 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%).

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Average rainfall in September
Richmond, VA

Average rainfall in September - Richmond, VA
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is August (2.87").
The driest month (with the least rainfall) is September (1.73").

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Average rainfall days in September
Richmond, VA

Average rainfall days in September - Richmond, VA
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is November (9.7 days).

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Average snowfall in September
Richmond, VA

Average snowfall in September - Richmond, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.05").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Richmond, VA

Average snowfall days in September - Richmond, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Richmond, VA

Average daylight in September / Average sunshine in September - Richmond, VA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 8.6h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is December (Average sunshine: 5.1h).

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Average sunshine days in September
Richmond, VA

Average sunshine days in September - Richmond, VA
  • Average sunshine days in September: 17.8 days

The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (12.1 days).

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Average UV index in September
Richmond, VA

Average UV index in September - Richmond, VA
  • Average UV index in September: 5

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

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Average cloud cover in September
Richmond, VA

Average cloud cover in September - Richmond, VA
  • Average cloud cover in September: 39

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in September
Richmond, VA

Average visibility in September - Richmond, VA
  • Average visibility in September: 6mi

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

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