May weather forecast
Reston, VA

Weather in May

The last month of the spring, May, is a warm month in Reston, Virginia, with an average temperature varying between 74.8°F (23.8°C) and 55.6°F (13.1°C).

Temperature

In May, the average high-temperature increases from an enjoyable 64.9°F (18.3°C) in April to a moderately hot 74.8°F (23.8°C). In Reston, in May, the average low-temperature is 55.6°F (13.1°C).

Humidity

The average relative humidity in May is 75%.

Rainfall

In Reston, it is raining for 16.3 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, in Reston, Virginia, there are 152.8 rainfall days, and 27.64" (702mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in May is 14h and 19min.
On the first day of the month, sunrise is at 6:11 am and sunset at 8:01 pm. On the last day of May, in Reston, sunrise is at 5:46 am and sunset at 8:28 pm EDT.

Sunshine

The average sunshine in May in Reston is 8.8h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Reston?

In May, in Reston, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 55.6°F (13.1°C).

What is the average humidity in May in Reston?

In May, the average relative humidity in Reston is 75%.

How many days does it rain in May in Reston?

In Reston, Virginia, in May, during 16.3 rainfall days, 2.76" (70mm) of precipitation is typically accumulated.

When it does not snow in Reston?

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

Does it snow in Reston in May?

In May, in Reston, Virginia, it doesn't snow. April is the latest month when it typically snows.

What is the average length of the day in May in Reston?

In May, the average day length in Reston is 14h and 19min.

When are sunrise and sunset in May in Reston?

On the first day of May in Reston, sunrise is at 6:11 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:28 pm EDT.

How many hours of sunshine does Reston have in May?

In May, the average sunshine duration in Reston is 8.8h.

What are the months with the highest UV index in Reston?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

How high is the UV index in May in Reston?

In Reston, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Reston, VA

Average temperature in May - Reston, VA
  • Average high temperature in May: 74.8°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in May: 55.6°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

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Average pressure in May
Reston, VA

Average pressure in May - Reston, VA
  • Average pressure in May: 30.01"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 May
Reston, VA

Average wind speed in May - Reston, VA
  • Average wind speed in May: 6.3mph

The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in May
Reston, VA

Average humidity in May - Reston, VA
  • Average humidity in May: 75%

The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in May
Reston, VA

Average rainfall in May - Reston, VA
  • Average rainfall in May: 2.76"

The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is January (1.77").

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Average rainfall days in May
Reston, VA

Average rainfall days in May - Reston, VA
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is November (9.3 days).

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Average snowfall in May
Reston, VA

Average snowfall in May - Reston, VA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in May
Reston, VA

Average snowfall days in May - Reston, VA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (4.6 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 May /
Average sunshine in May
Reston, VA

Average daylight in May / Average sunshine in May - Reston, VA
  • Average daylight in May: 14h and 19min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in May: 8h and 48min

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 May
Reston, VA

Average sunshine days in May - Reston, VA
  • Average sunshine days in May: 12.8 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (12.8 days).

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Average UV index in May
Reston, VA

Average UV index in May - Reston, VA
  • Average UV index in May: 6

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 May
Reston, VA

Average cloud cover in May - Reston, VA
  • Average cloud cover in May: 44

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

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Average visibility in May
Reston, VA

Average visibility in May - Reston, VA
  • Average visibility in May: 5mi

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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