September weather forecast
Grundy, VA

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Weather in September

The first month of the autumn, September, is still a warm month in Grundy, Virginia, with temperature in the range of an average low of 54.9°F (12.7°C) and an average high of 77.4°F (25.2°C).

Temperature

September heralds a minor drop in average high-temperature, sliding from August's 82.8°F (28.2°C) to a still moderately hot 77.4°F (25.2°C). In September, the temperature sees a substantial plunge from daytime highs to a low average of 54.9°F (12.7°C).

Humidity

The average relative humidity in September is 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 14 days and typically collects 1.65" (42mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

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 is 8.1h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The daily high UV index of 4 in September translates into this advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

In September, the average high-temperature and low-temperature are 77.4°F (25.2°C) and 54.9°F (12.7°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in August is estimated at 89.6°F (32°C).

What is the average humidity in September?

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

What is the driest month?

The month with the least rainfall is September, when the rain falls for 14 days and typically collects 1.65" (42mm) of precipitation.

How many days does it rain in September?

In September, in Grundy, the rain falls for 14 days. Throughout September, 1.65" (42mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in Grundy in September?

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

What is the average length of the day 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, 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 many hours of sunshine does Grundy have in September?

In September, the average sunshine duration is 8.1h.

How high is the UV index in September?

In Grundy, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat 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
Grundy, VA

Average temperature in September - Grundy, VA
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in September
Grundy, VA

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

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

Average wind speed in September
Grundy, VA

Average wind speed in September - Grundy, VA
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

Average humidity in September
Grundy, VA

Average humidity in September - Grundy, VA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and November (76%).

Average rainfall in September
Grundy, VA

Average rainfall in September - Grundy, VA
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is February (3.7").
The driest month (with the least rainfall) is September (1.65").

Average rainfall days in September
Grundy, VA

Average rainfall days in September - Grundy, VA
  • Average rainfall days in September: 14 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (9.4 days).

Average snowfall in September
Grundy, VA

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

The month with the highest snowfall is February (5.59").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Grundy, VA

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

The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Grundy, 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 1min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in September
Grundy, VA

Average sunshine days in September - Grundy, VA
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (10.7 days).

Average UV index in September
Grundy, VA

Average UV index in September - Grundy, VA
  • Average UV index in September: 4

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, February and December (UV index 2).

Average cloud cover in September
Grundy, VA

Average cloud cover in September - Grundy, VA
  • Average cloud cover in September: 38

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 35).

Average visibility in September
Grundy, VA

Average visibility in September - Grundy, VA
  • Average visibility in September: 5mi

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

Grundy, Virginia, USA

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