July weather forecast
Potomac, MD

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Weather in July

July in Potomac, Maryland, is a tropical summer month, with an average temperature ranging between min 68.5°F (20.3°C) and max 87.4°F (30.8°C).

Temperature

Potomac's July weather reaches an average high of 87.4°F (30.8°C) and an average low of 68.5°F (20.3°C), making it the warmest month.

Heat index

The average heat index in July is calculated to be a very hot 98.6°F (37°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'feels like', blends air temperature and moisture content to represent the felt temperature to humans. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

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

Rainfall

In Potomac, in July, it is raining for 16.1 days, with typically 3.15" (80mm) of accumulated precipitation. In Potomac, Maryland, during the entire year, the rain falls for 156.5 days and collects up to 30.71" (780mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In July, the average length of the day is 14h and 35min.
On the first day of the month, sunrise is at 5:47 am and sunset at 8:38 pm. On the last day of July, sunrise is at 6:09 am and sunset at 8:21 pm EDT.

Sunshine

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

UV index

The months with the highest UV index in Potomac are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 6 in July converts into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

What is the warmest month in Potomac?

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

How hot does it get in Potomac in July?

The high-temperature, in July, in Potomac, is 87.4°F (30.8°C), while the low-temperature averages to 68.5°F (20.3°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 98.6°F (37°C).

What is the least humid month in Potomac?

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

What is the average humidity in July in Potomac?

In Potomac, Maryland, the average relative humidity in July is 69%.

How many days does it rain in July in Potomac?

In Potomac, Maryland, during July, the rain falls for 16.1 days and regularly aggregates up to 3.15" (80mm) of precipitation.

When it does not snow in Potomac?

May through October are months without snowfall in Potomac.

What is the average length of the day in July in Potomac?

The average day length in July in Potomac is 14h and 35min.

When is the sunrise / sunset in July in Potomac?

On the first day of July in Potomac, sunrise is at 5:47 am and sunset at 8:38 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:21 pm EDT.

What month has the most sunshine in Potomac?

July has the most sunshine of the year, with an average of 10.8h of sunshine.

How many hours of sunshine does Potomac have in July?

The average sunshine duration in July in Potomac is 10.8h.

When is the highest UV index in Potomac?

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

How high is the UV index in July in Potomac?

In July, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Potomac, MD

Average temperature in July - Potomac, MD
  • Average high temperature in July: 87.4°F

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).

  • Average low temperature in July: 68.5°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 July
Potomac, MD

Average pressure in July - Potomac, MD
  • Average pressure in July: 29.97"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 July
Potomac, MD

Average wind speed in July - Potomac, MD
  • Average wind speed in July: 5mph

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 in July
Potomac, MD

Average humidity in July - Potomac, MD
  • Average humidity in July: 69%

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 July
Potomac, MD

Average rainfall in July - Potomac, MD
  • Average rainfall in July: 3.15"

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 in July
Potomac, MD

Average rainfall days in July - Potomac, MD
  • Average rainfall days in July: 16.1 days

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 in July
Potomac, MD

Average snowfall in July - Potomac, MD
  • Average snowfall in July: 0"

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 in July
Potomac, MD

Average snowfall days in July - Potomac, MD
  • Average snowfall days in July: 0 days

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 in July /
Average sunshine in July
Potomac, MD

Average daylight in July / Average sunshine in July - Potomac, MD
  • Average daylight in July: 14h and 4min

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 July: 10h and 5min

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 in July
Potomac, MD

Average sunshine days in July - Potomac, MD
  • Average sunshine days in July: 12.6 days

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 in July
Potomac, MD

Average UV index in July - Potomac, MD
  • Average UV index in July: 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 July
Potomac, MD

Average cloud cover in July - Potomac, MD
  • Average cloud cover in July: 31

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 July
Potomac, MD

Average visibility in July - Potomac, MD
  • Average visibility in July: 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).

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Potomac, Maryland, USA

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