Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
Herndon, Virginia, in October experiences a subtle temperature decline, with average high-temperatures reducing from a moderately hot 78.3°F (25.7°C) in September to a refreshing 66°F (18.9°C). An average low-temperature of 49.1°F (9.5°C) is common during the nights of October.Humidity
In October, the average relative humidity is 77%.Rainfall
In Herndon, in October, it is raining for 12 days, with typically 2.52" (64mm) of accumulated precipitation. In Herndon, during the entire year, the rain falls for 158.1 days and collects up to 31.46" (799mm) of precipitation.Snowfall
May through October are months without snowfall in Herndon.Daylight
In Herndon, the average length of the day in October is 11h and 10min.On the first day of the month, sunrise is at 7:06 am and sunset at 6:51 pm. On the last day of October, sunrise is at 7:36 am and sunset at 6:09 pm EDT.
Sunshine
The average sunshine in October is 5.5h.UV index
In Herndon, the average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 3 in October translates into the following instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in October?
What is the average humidity in October?
How much does it rain in October?
When it does not snow in Herndon?
Does it snow in October?
How many hours of daylight does Herndon have in October?
When is the sunrise / sunset in October?
How many hours of sunshine does Herndon have in October?
How high is the UV index in October?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
Herndon, Virginia, USA
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