September weather forecast
Mount Heron, VA

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Weather in September

The first month of the autumn, September, is still a warm month in Mount Heron, Virginia, with an average temperature fluctuating between 76.1°F (24.5°C) and 53.6°F (12°C).

Temperature

The arrival of September corresponds with a light shift in temperature, down from 81.7°F (27.6°C) in August to a still moderately hot 76.1°F (24.5°C). Mount Heron in September observes a substantial swing from the daily highs, with average nighttime temperatures of 53.6°F (12°C).

Humidity

In Mount Heron, the average relative humidity in September is 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.2 days and typically collects 1.14" (29mm) of precipitation.

Snowfall

In Mount Heron, Virginia, snow does not fall in June through September.

Daylight

In Mount Heron, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:59 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:12 pm EDT.

Sunshine

In September, the average sunshine in Mount Heron is 8.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

The average high-temperature, in September, in Mount Heron, is 76.1°F (24.5°C), while the average low-temperature is 53.6°F (12°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, in August is appraised at 87.8°F (31°C).

What is the average humidity in September?

In Mount Heron, the average relative humidity in September is 78%.

What is the driest month in Mount Heron?

The month with the least rainfall is September, when the rain falls for 13.2 days and typically collects 1.14" (29mm) of precipitation.

How much does it rain in September?

In Mount Heron, during September, the rain falls for 13.2 days and regularly aggregates up to 1.14" (29mm) of precipitation.

When it does not snow?

June through September are months without snowfall in Mount Heron.

Does it snow in September?

In Mount Heron, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Mount Heron have in September?

The average day length in September is 12h and 25min.

When are sunrise and sunset in September?

On the first day of September in Mount Heron, Virginia, sunrise is at 6:59 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:12 pm EDT.

How long on average sun shines in September?

In Mount Heron, the average sunshine duration in September is 8.4h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. 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
Mount Heron, VA

Average temperature in September - Mount Heron, VA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 53.6°F

The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).

Average pressure in September
Mount Heron, VA

Average pressure in September - Mount Heron, VA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).

Average wind speed in September
Mount Heron, VA

Average wind speed in September - Mount Heron, VA
  • Average wind speed in September: 4.5mph

The windiest months (with the highest average wind speed) are January, February and April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity in September
Mount Heron, VA

Average humidity in September - Mount Heron, VA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is November (76%).

Average rainfall in September
Mount Heron, VA

Average rainfall in September - Mount Heron, VA
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is February (2.72").
The driest month (with the least rainfall) is September (1.14").

Average rainfall days in September
Mount Heron, VA

Average rainfall days in September - Mount Heron, VA
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is November (8.5 days).

Average snowfall in September
Mount Heron, VA

Average snowfall in September - Mount Heron, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (4.65").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Mount Heron, VA

Average snowfall days in September - Mount Heron, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Mount Heron, VA

Average daylight in September / Average sunshine in September - Mount Heron, 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: 8h and 2min

The months with the most sunshine are June, July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in September
Mount Heron, VA

Average sunshine days in September - Mount Heron, VA
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is May (10.3 days).

Average UV index in September
Mount Heron, VA

Average UV index in September - Mount Heron, VA
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Mount Heron, VA

Average cloud cover in September - Mount Heron, VA
  • Average cloud cover in September: 39

The months with the most cloud cover are January and February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 37).

Average visibility in September
Mount Heron, VA

Average visibility in September - Mount Heron, VA
  • Average visibility in September: 5mi

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

Mount Heron, Virginia, USA

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