September weather forecast
Roberts Mill, VA

Share

Weather in September

The first month of the autumn, September, is also a moderately hot month in Roberts Mill, Virginia, with an average temperature varying between 74.5°F (23.6°C) and 52.2°F (11.2°C).

Temperature

The arrival of September is marked by an average high-temperature of a still warm 74.5°F (23.6°C), bearing a close resemblance to August. Despite higher daytime temperatures, nighttime averages fall to a fresh 52.2°F (11.2°C) in September in Roberts Mill.

Humidity

In Roberts Mill, the average relative humidity in September is 80%.

Rainfall

The month with the least rainfall is September, when the rain falls for 16.9 days and typically collects 1.77" (45mm) of precipitation.

Snowfall

In Roberts Mill, Virginia, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 24min.
On the first day of the month, sunrise is at 6:57 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:10 pm EDT.

Sunshine

In September, the average sunshine is 8.2h.

UV index

In Roberts Mill, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

The average high-temperature and low-temperature during September are 74.5°F (23.6°C) and 52.2°F (11.2°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in July is estimated at 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 80%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 16.9 days and accumulates 1.77" (45mm) of precipitation.

How much does it rain in September?

In Roberts Mill, in September, it is raining for 16.9 days, with typically 1.77" (45mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in Roberts Mill in September?

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

How many hours of daylight does Roberts Mill have in September?

In September, the average day length is 12h and 24min.

When is the sunrise / sunset in September?

On the first day of September in Roberts Mill, sunrise is at 6:57 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:10 pm EDT.

How long on average sun shines in September in Roberts Mill?

In September, the average sunshine duration in Roberts Mill is 8.2h.

What is the UV index reading in September?

In Roberts Mill, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from 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
Roberts Mill, VA

Average temperature in September - Roberts Mill, VA
  • Average high temperature in September: 74.5°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 52.2°F

The month with the highest average low temperature is July (57.9°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in September
Roberts Mill, VA

Average pressure in September - Roberts Mill, 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
Roberts Mill, VA

Average wind speed in September - Roberts Mill, VA
  • Average wind speed in September: 4.7mph

The windiest months (with the highest average wind speed) are January and February (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in September
Roberts Mill, VA

Average humidity in September - Roberts Mill, VA
  • Average humidity in September: 80%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is November (77%).

Average rainfall in September
Roberts Mill, VA

Average rainfall in September - Roberts Mill, VA
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in September
Roberts Mill, VA

Average rainfall days in September - Roberts Mill, VA
  • Average rainfall days in September: 16.9 days

The month with the highest number of rainy days is July (22 days).
The month with the least rainy days is November (10.8 days).

Average snowfall in September
Roberts Mill, VA

Average snowfall in September - Roberts Mill, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (4.8").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Roberts Mill, VA

Average snowfall days in September - Roberts Mill, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Roberts Mill, VA

Average daylight in September / Average sunshine in September - Roberts Mill, VA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in September
Roberts Mill, VA

Average sunshine days in September - Roberts Mill, VA
  • Average sunshine days in September: 10.2 days

The month with the most sunshine days is November (15.6 days).
The month with the least sunshine days is May (6.7 days).

Average UV index in September
Roberts Mill, VA

Average UV index in September - Roberts Mill, VA
  • Average UV index in September: 4

The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Roberts Mill, VA

Average cloud cover in September - Roberts Mill, VA
  • Average cloud cover in September: 43

The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are June, July and August (Cloud cover 40).

Average visibility in September
Roberts Mill, VA

Average visibility in September - Roberts Mill, VA
  • Average visibility in September: 4mi

The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (5mi).
The month with the lowest visibility is September (4mi).

Roberts Mill, Virginia, USA

Weather forecast for your location

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