Climate and monthly weather forecast
Potomac, MD

Weather in January

January, like December, in Potomac, Maryland, is another cold winter month, with an average temperature varying between 39.4°F (4.1°C) and 26.4°F (-3.1°C). With an average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 26.4°F (-3.1°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Potomac, is a chilly month, with temperature in the range of an average low of 28.8°F (-1.8°C) and an average high of 43.9°F (6.6°C). In Potomac, the average high-temperature in February is practically the same as in January - a chilly 43.9°F (6.6°C). Weather in February »

Weather in March

March, the first month of the spring in Potomac, is a cool month, with an average temperature varying between 52.3°F (11.3°C) and 36.1°F (2.3°C). In March, the average high-temperature marginally rises from a frosty 43.9°F (6.6°C) in February to a cool 52.3°F (11.3°C). Weather in March »

Weather in April

April is a comfortable spring month in Potomac, Maryland, with an average temperature varying between 64.9°F (18.3°C) and 46°F (7.8°C). In April, the average high-temperature rises from a fresh 52.3°F (11.3°C) in March to an enjoyable 64.9°F (18.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderately hot month in Potomac, Maryland, with an average temperature ranging between max 74.3°F (23.5°C) and min 55.6°F (13.1°C). In May, the average high-temperature increases from a comfortable 64.9°F (18.3°C) in April to a warm 74.3°F (23.5°C). Weather in May »

Weather in June

June, the first month of the summer in Potomac, is still a warm month, with temperature in the range of an average high of 82.2°F (27.9°C) and an average low of 63.5°F (17.5°C). In June, the average high-temperature slightly increases from 74.3°F (23.5°C) in May to a still moderately hot 82.2°F (27.9°C). Weather in June »

Weather in July

July is a hot summer month in Potomac, Maryland, with an average temperature varying between 68.5°F (20.3°C) and 87.4°F (30.8°C). The warmest month is July, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C). In July, the average heat index is calculated to be a very hot 98.6°F (37°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Potomac, Maryland, with an average temperature fluctuating between 67.3°F (19.6°C) and 85.5°F (29.7°C). In August, the average high-temperature is relatively the same as in July - a warm 85.5°F (29.7°C). Weather in August »

Weather in September

September, the first month of the autumn in Potomac, is still a warm month, with temperature in the range of an average high of 78.3°F (25.7°C) and an average low of 60.8°F (16°C). In September, the average high-temperature marginally drops from 85.5°F (29.7°C) in August to a still warm 78.3°F (25.7°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Potomac, Maryland, with an average temperature varying between 49.8°F (9.9°C) and 65.8°F (18.8°C). In October, the average high-temperature drops from a warm 78.3°F (25.7°C) in September to a comfortable 65.8°F (18.8°C). Weather in October »

Weather in November

November, the last month of the autumn in Potomac, is also a fresh month, with an average temperature ranging between min 38.7°F (3.7°C) and max 53.4°F (11.9°C). In November, the average high-temperature decreases from an enjoyable 65.8°F (18.8°C) in October to a fresh 53.4°F (11.9°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Potomac, Maryland, with an average temperature varying between 45.5°F (7.5°C) and 32.9°F (0.5°C). In December, the average high-temperature slightly decreases from a fresh 53.4°F (11.9°C) in November to a chilly 45.5°F (7.5°C). Weather in December »
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FAQ

What is the coldest month in Potomac?

The coldest month in Potomac, Maryland, is January, with an average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 26.4°F (-3.1°C).

How many days does it rain in Potomac?

In Potomac, Maryland, during the entire year, the rain falls for 156.5 days and collects up to 30.71" (780mm) of precipitation.

When does it snow in Potomac?

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

How many days does it snow in Potomac?

In Potomac, during the entire year, snow falls for 15.5 days and aggregates up to 10.24" (260mm) of snow.

What is the month with the lowest UV index in Potomac?

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

What is the driest month in Potomac?

The month with the least rainfall is February, when the rain falls for 9.3 days and typically collects 1.93" (49mm) of precipitation.

What is the month with the least sunshine in Potomac?

The month with the least sunshine is February, with an average of 5h of sunshine.

What is the snowiest month in Potomac?

March is the month with the most snowfall in Potomac. Snow falls for 3.5 days and accumulates 3.03" (77mm) of snow.

When is Daylight Saving Time (DST) in Potomac?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Potomac, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from EDT to EST.

When it does not snow in Potomac?

May through October are months without snowfall in Potomac, Maryland.

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

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

When are the longest days in Potomac?

June has the longest days of the year in Potomac, Maryland, with an average of 14h and 52min of daylight.

What is the warmest month in Potomac?

July is the warmest month, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C).

What is the least humid month in Potomac?

July is the least humid month in Potomac, with an average relative humidity of 69%.

What month has the most sunshine in Potomac?

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

What is the rainiest month in Potomac?

The month with the most rainfall in Potomac is August, when the rain falls for 17.3 days and typically aggregates up to 3.86" (98mm) of precipitation.

What are the most humid months in Potomac?

October and December, with an average relative humidity of 76%, are most humid months.

What is the month with the shortest days in Potomac?

With an average of 9h and 29min of daylight, December has the shortest days of the year.

Average temperature
Potomac, MD

Average temperature - Potomac, MD

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.4°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
Potomac, MD

Average pressure - Potomac, MD

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
Potomac, MD

Average wind speed - Potomac, MD

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity
Potomac, MD

Average humidity - Potomac, MD

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
Potomac, MD

Average rainfall - Potomac, MD

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is February (1.93").

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Average rainfall days
Potomac, MD

Average rainfall days - Potomac, MD

The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is January (8.1 days).

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Average snowfall
Potomac, MD

Average snowfall - Potomac, MD

The month with the highest snowfall is March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Potomac, MD

Average snowfall days - Potomac, MD

The month with the highest number of snowfall days is February (4.8 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
Potomac, MD

Average daylight / Average sunshine - Potomac, MD

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).

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days
Potomac, MD

Average sunshine days - Potomac, MD

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.7 days).

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Average UV index
Potomac, MD

Average UV index - Potomac, MD

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
Potomac, MD

Average visibility - Potomac, MD

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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