May weather forecast
Fairfax, VA

Weather in May

The last month of the spring, May, is a warm month in Fairfax, Virginia, with temperature in the range of an average low of 55.9°F (13.3°C) and an average high of 74.8°F (23.8°C).

Temperature

In Fairfax, Virginia, the average high-temperature in May increases from a comfortable 65.1°F (18.4°C) in April to a moderately hot 74.8°F (23.8°C). In May, the average low-temperature is 55.9°F (13.3°C).

Humidity

The average relative humidity in May is 76%.

Rainfall

In Fairfax, it is raining for 17.3 days, with typically 3.11" (79mm) of accumulated precipitation. Throughout the year, in Fairfax, there are 162 rainfall days, and 31.65" (804mm) of precipitation is accumulated.

Snowfall

In Fairfax, snow does not fall through October.

Daylight

In Fairfax, Virginia, 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, sunrise is at 5:46 am and sunset at 8:27 pm EDT.

Sunshine

In May, the average sunshine is 9.1h.

UV index

The months with the highest UV index in Fairfax are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 Fairfax?

In Fairfax, Virginia, in May, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 55.9°F (13.3°C).

What is the average humidity in May in Fairfax?

The average relative humidity in May is 76%.

How much does it rain in Fairfax in May?

In Fairfax, in May, it is raining for 17.3 days, with typically 3.11" (79mm) of accumulated precipitation.

When it does not snow in Fairfax?

May through October are months without snowfall in Fairfax.

Does it snow in Fairfax in May?

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

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

The average day length in May is 14h and 19min.

What time are sunrise and sunset in May in Fairfax?

In May, on the first day of the month, sunrise is at 6:11 am and sunset at 8:01 pm. On the last day of the month, in Fairfax, sunrise is at 5:46 am and sunset at 8:27 pm EDT.

How many hours of sunshine does Fairfax have in May?

In May, the average sunshine duration in Fairfax, Virginia, is 9.1h.

When is the highest UV index in Fairfax?

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

How high is the UV index in May in Fairfax?

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

Average temperature in May
Fairfax, VA

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

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.5°F).

  • Average low temperature in May: 55.9°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

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Average pressure in May
Fairfax, VA

Average pressure in May - Fairfax, 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
Fairfax, VA

Average wind speed in May - Fairfax, VA
  • Average wind speed in May: 6.1mph

The windiest month (with the highest average wind speed) is March (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in May
Fairfax, VA

Average humidity in May - Fairfax, VA
  • Average humidity in May: 76%

The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in May
Fairfax, VA

Average rainfall in May - Fairfax, VA
  • Average rainfall in May: 3.11"

The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is September (2.01").

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Average rainfall days in May
Fairfax, VA

Average rainfall days in May - Fairfax, VA
  • Average rainfall days in May: 17.3 days

The months with the highest number of rainy days are May and August (17.3 days).
The month with the least rainy days is November (9.1 days).

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Average snowfall in May
Fairfax, VA

Average snowfall in May - Fairfax, VA
  • Average snowfall in May: 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 May
Fairfax, VA

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

The month with the highest number of snowfall days is January (5.6 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
Fairfax, VA

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

The month with the longest days is June (Average daylight: 14h and 51min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in May: 9h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).

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Average sunshine days in May
Fairfax, VA

Average sunshine days in May - Fairfax, VA
  • Average sunshine days in May: 11.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (11.3 days).

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Average UV index in May
Fairfax, VA

Average UV index in May - Fairfax, 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
Fairfax, VA

Average cloud cover in May - Fairfax, VA
  • Average cloud cover in May: 43

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in May
Fairfax, VA

Average visibility in May - Fairfax, 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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