October weather forecast
Herndon, VA

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Weather in October

October is the month where Herndon fully embraces the autumn season. By now, the average high temperature has dwindled to a cool 66°F (18.9°C), strips of multicolored leaves coat the streets of the city, creating a vibrant and dynamic scene. October represents an ideal time to partake in pumpkin picking, fall festivals or apple cider tasting, as these activities are synonymous with Virginia's fall culture. The decrease in temperature, coupled with pleasant weather, accentuates the stunning fall colors sprinkling the city. A unique feature of October is the increase in wind speed, adding an extra dose of chill to the air.

Temperature

Arrival of October comes with a reduction in the average high-temperature, falling from a moderately hot 78.3°F (25.7°C) in September to a refreshing 66°F (18.9°C). The low-temperature average for Herndon during October stands at a chilly 49.1°F (9.5°C).

Humidity

The average relative humidity in October is 77%.

Rainfall

In Herndon, in October, during 12 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. In Herndon, Virginia, during the entire year, the rain falls for 158.1 days and collects up to 31.46" (799mm) of precipitation.

Snowfall

In Herndon, snow does not fall in May through October.

Daylight

The average length of the day in October is 11h and 10min.
On the first day of October, sunrise is at 7:06 am and sunset at 6:51 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 6:09 pm EDT.

Sunshine

In Herndon, the average sunshine in October is 5.5h.

UV index

The average daily maximum UV index in October is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In October, the maximum UV index of 3 suggests these recommendations:
Ensure safety - Sun damage prevention is strongly urged. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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Frequently asked questions

What is the usual temperature for Herndon in October?

The average high-temperature and low-temperature in Herndon, Virginia, during October are 66°F (18.9°C) and 49.1°F (9.5°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 95°F (35°C).

What is the average humidity in October in Herndon?

In October, the average relative humidity is 77%.

How many days does it rain in October in Herndon?

In Herndon, Virginia, in October, during 12 rainfall days, 2.52" (64mm) of precipitation is typically accumulated.

When it does not snow in Herndon?

In Herndon, snow does not fall in May through October.

Does it snow in Herndon in October?

In Herndon, Virginia, in October, it doesn't snow. In November, it regularly snows.

What is the average length of the day in October in Herndon?

The average day length in October is 11h and 10min.

What time are sunrise and sunset in October in Herndon?

In October, on the first day of the month, sunrise is at 7:06 am and sunset at 6:51 pm. On the last day of the month, in Herndon, sunrise is at 7:36 am and sunset at 6:09 pm EDT.

How many hours of sunshine does Herndon have in October?

In Herndon, the average sunshine duration in October is 5.5h.

What is the UV index intensity in October in Herndon?

The average daily maximum UV index in October in Herndon is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
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 October
Herndon, VA

Average temperature in October - Herndon, VA
  • Average high temperature in October: 66°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in October: 49.1°F

The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

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Average pressure in October
Herndon, VA

Average pressure in October - Herndon, VA
  • Average pressure in October: 30.04"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).

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Average wind speed in October
Herndon, VA

Average wind speed in October - Herndon, VA
  • Average wind speed in October: 6.2mph

The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in October
Herndon, VA

Average humidity in October - Herndon, VA
  • Average humidity in October: 77%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in October
Herndon, VA

Average rainfall in October - Herndon, VA
  • Average rainfall in October: 2.52"

The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in October
Herndon, VA

Average rainfall days in October - Herndon, VA
  • Average rainfall days in October: 12 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (9.3 days).

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Average snowfall in October
Herndon, VA

Average snowfall in October - Herndon, VA
  • Average snowfall in October: 0"

The month with the highest snowfall is January (3.54").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in October
Herndon, VA

Average snowfall days in October - Herndon, VA
  • Average snowfall days in October: 0 days

The months with the highest number of snowfall days are January and February (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in October /
Average sunshine in October
Herndon, VA

Average daylight in October / Average sunshine in October - Herndon, VA
  • Average daylight in October: 11h and 1min

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 October: 5h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).

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Average sunshine days in October
Herndon, VA

Average sunshine days in October - Herndon, VA
  • Average sunshine days in October: 17.3 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in October
Herndon, VA

Average UV index in October - Herndon, VA
  • Average UV index in October: 3

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).

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Average cloud cover in October
Herndon, VA

Average cloud cover in October - Herndon, VA
  • Average cloud cover in October: 40

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in October
Herndon, VA

Average visibility in October - Herndon, VA
  • Average visibility in October: 6mi

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

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Herndon, Virginia, USA

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