September weather forecast
Hillsboro, VA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Hillsboro, Virginia, with an average temperature fluctuating between 77.4°F (25.2°C) and 58.3°F (14.6°C).

Temperature

With the onset of September, Hillsboro experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 84.6°F (29.2°C) in August to a still warm 77.4°F (25.2°C). In Hillsboro, an average temperature of 58.3°F (14.6°C) is noted during September nights.

Humidity

The average relative humidity in September is 77%.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.7 days and typically collects 1.93" (49mm) of precipitation.

Snowfall

In Hillsboro, snow does not fall in May through September.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:54 pm EDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 4 during September translates into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Hillsboro in September?

During September, Hillsboro experiences an average high-temperature of 77.4°F (25.2°C) and a low-temperature of 58.3°F (14.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in August is computed to be 93.2°F (34°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

What is the driest month?

September is the month with the least rainfall in Hillsboro. Rain falls for 13.7 days and accumulates 1.93" (49mm) of precipitation.

How many days does it rain in September?

In Hillsboro, in September, it is raining for 13.7 days, with typically 1.93" (49mm) of accumulated precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

In Hillsboro, 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 26min.

When are sunrise and sunset in September?

On the first day of September in Hillsboro, sunrise is at 6:40 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:54 pm EDT.

How many hours of sunshine does Hillsboro have in September?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September in Hillsboro?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Hillsboro, VA

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

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in September: 58.3°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in September
Hillsboro, VA

Average pressure in September - Hillsboro, VA
  • Average pressure in September: 30.06"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
Hillsboro, VA

Average wind speed in September - Hillsboro, VA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is March (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

Average humidity in September
Hillsboro, VA

Average humidity in September - Hillsboro, VA
  • Average humidity in September: 77%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (73%).

Average rainfall in September
Hillsboro, VA

Average rainfall in September - Hillsboro, VA
  • Average rainfall in September: 1.93"

The wettest months (with the highest rainfall) are May and August (3.35").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in September
Hillsboro, VA

Average rainfall days in September - Hillsboro, VA
  • Average rainfall days in September: 13.7 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (10.1 days).

Average snowfall in September
Hillsboro, VA

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

The month with the highest snowfall is January (4.17").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Hillsboro, VA

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

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Hillsboro, VA

Average sunshine days in September - Hillsboro, VA
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in September
Hillsboro, VA

Average UV index in September - Hillsboro, 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, November and December (UV index 2).

Average cloud cover in September
Hillsboro, VA

Average cloud cover in September - Hillsboro, VA
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
Hillsboro, VA

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

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

Hillsboro, Virginia, USA

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