Climate and monthly weather forecast
Fairfax, VA

Weather in January

January, like December, in Fairfax, Virginia, is another cold winter month, with an average temperature varying between 26.4°F (-3.1°C) and 40.5°F (4.7°C). The coldest month is January, with an average high-temperature of 40.5°F (4.7°C) and an average low-temperature of 26.4°F (-3.1°C). Weather in January »

Weather in February

February, the last month of the winter in Fairfax, is a chilly month, with an average temperature varying between 29.1°F (-1.6°C) and 44.4°F (6.9°C). In Fairfax, the average high-temperature in February is practically the same as in January - a chilly 44.4°F (6.9°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Fairfax, Virginia, with temperature in the range of an average high of 52.7°F (11.5°C) and an average low of 36.9°F (2.7°C). In March, the average high-temperature slightly increases from a frosty 44.4°F (6.9°C) in February to a cool 52.7°F (11.5°C). Weather in March »

Weather in April

April in Fairfax, Virginia, is a comfortable spring month, with an average temperature ranging between min 46.2°F (7.9°C) and max 65.1°F (18.4°C). In April, the average high-temperature rises from a cool 52.7°F (11.5°C) in March to an enjoyable 65.1°F (18.4°C). Weather in April »

Weather in May

May, the last month of the spring in Fairfax, is a warm month, with an average temperature varying between 55.9°F (13.3°C) and 74.8°F (23.8°C). In Fairfax, the average high-temperature in May rises from a comfortable 65.1°F (18.4°C) in April to a moderately hot 74.8°F (23.8°C). Weather in May »

Weather in June

June, the first month of the summer in Fairfax, is still a warm month, with an average temperature fluctuating between 63.5°F (17.5°C) and 82.9°F (28.3°C). In Fairfax, the average high-temperature in June slightly increases from 74.8°F (23.8°C) in May to a still warm 82.9°F (28.3°C). Weather in June »

Weather in July

July in Fairfax, Virginia, is a tropical summer month, with an average temperature ranging between min 68.4°F (20.2°C) and max 88°F (31.1°C). With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 68.4°F (20.2°C), July is the warmest month. The average heat index in July is estimated at a torrid 100.8°F (38.2°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Fairfax, Virginia, with an average temperature ranging between max 85.8°F (29.9°C) and min 66.9°F (19.4°C). In Fairfax, Virginia, the average high-temperature in August is essentially the same as in July - a moderately hot 85.8°F (29.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Fairfax, Virginia, with temperature in the range of an average low of 60.6°F (15.9°C) and an average high of 78.4°F (25.8°C). In September, the average high-temperature marginally drops from 85.8°F (29.9°C) in August to a still warm 78.4°F (25.8°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Fairfax, Virginia, with temperature in the range of an average high of 66.6°F (19.2°C) and an average low of 49.8°F (9.9°C). In Fairfax, the average high-temperature in October drops from a warm 78.4°F (25.8°C) in September to an enjoyable 66.6°F (19.2°C). Weather in October »

Weather in November

November, the last month of the autumn in Fairfax, is another cool month, with an average temperature ranging between min 38.5°F (3.6°C) and max 54.5°F (12.5°C). In November, the average high-temperature decreases from an enjoyable 66.6°F (19.2°C) in October to a cool 54.5°F (12.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Fairfax, Virginia, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 32.9°F (0.5°C). In December, the average high-temperature decreases from a fresh 54.5°F (12.5°C) in November to a frosty 45.5°F (7.5°C). Weather in December »
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FAQ

What is the coldest month in Fairfax?

January is the coldest month in Fairfax, with an average high-temperature of 40.5°F (4.7°C) and an average low-temperature of 26.4°F (-3.1°C).

How many days does it rain in Fairfax?

Throughout the year, in Fairfax, there are 162 rainfall days, and 31.65" (804mm) of precipitation is accumulated.

When does it snow in Fairfax?

January through April, November and December are months with snowfall in Fairfax, Virginia.

What is the snowiest month in Fairfax?

January is the month with the most snowfall. Snow falls for 5.6 days and accumulates 3.54" (90mm) of snow.

How many days does it snow in Fairfax?

In Fairfax, during the entire year, snow falls for 18 days and aggregates up to 11.18" (284mm) of snow.

What is the month with the least sunshine in Fairfax?

January, February and December, with an average of 5.2h of sunshine, are months with the least sunshine.

What are the months with the lowest UV index in Fairfax?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

When is Daylight Saving Time (DST) in Fairfax?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

When it does not snow in Fairfax?

May through October are months without snowfall in Fairfax, Virginia.

What is the month with the highest UV index in Fairfax?

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

When are the longest days in Fairfax?

June has the longest days of the year in Fairfax, Virginia, with an average of 14h and 51min of daylight.

What is the warmest month in Fairfax?

July is the warmest month in Fairfax, Virginia, with an average high-temperature of 88°F (31.1°C) and an average low-temperature of 68.4°F (20.2°C).

What is the least humid month in Fairfax?

The least humid month in Fairfax is July, with an average relative humidity of 71%.

What month has the most sunshine in Fairfax?

The month with the most sunshine in Fairfax, Virginia, is July, with an average of 10.8h of sunshine.

What is the rainiest month in Fairfax?

August is the month with the most rainfall in Fairfax, Virginia. Rain falls for 17.3 days and accumulates 3.78" (96mm) of precipitation.

What is the driest month in Fairfax?

The month with the least rainfall is September, when the rain falls for 13.1 days and typically collects 2.01" (51mm) of precipitation.

What are the most humid months in Fairfax?

The months with the highest humidity in Fairfax are October and December, with an average relative humidity of 77%.

What is the month with the shortest days in Fairfax?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

Average temperature
Fairfax, VA

Average temperature - Fairfax, VA

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).

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
Fairfax, VA

Average pressure - Fairfax, VA

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
Fairfax, VA

Average wind speed - Fairfax, VA

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
Fairfax, VA

Average humidity - Fairfax, VA

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
Fairfax, VA

Average rainfall - Fairfax, VA

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
Fairfax, VA

Average rainfall days - Fairfax, VA

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
Fairfax, VA

Average snowfall - Fairfax, VA

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
Fairfax, VA

Average snowfall days - Fairfax, VA

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 / Average sunshine
Fairfax, VA

Average daylight / Average sunshine - Fairfax, VA

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).

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
Fairfax, VA

Average sunshine days - Fairfax, VA

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
Fairfax, VA

Average UV index - Fairfax, VA

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 visibility
Fairfax, VA

Average visibility - Fairfax, VA

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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