July weather forecastPortsmouth, VA
July
Weather in July
July's illustrious zenith of the sunny season in Portsmouth brings forth the year's highest temperatures, averaging 86.4°F (30.2°C) as the high. A notable UV index of 7 indicates the health-aware populace about the intense sun. Picnics, barbecues, and outdoor activities dominate this part of the year. Contrasting the outdoor humidity, residents often resort to air-conditioned premises in their attempt to beat the heat. As such, July becomes a hub of summer activities both indoors and outdoors.Temperature
Portsmouth witnesses the warmest weather in July, with temperatures averaging a high of 86.4°F (30.2°C) and a low of 73.6°F (23.1°C).Heat index
July's mean heat index is calculated to be a fiery hot 98.6°F (37°C). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.
Humidity
The months with the lowest humidity are July and November, with an average relative humidity of 74%.Rainfall
In Portsmouth, in July, it is raining for 17.4 days, with typically 2.2" (56mm) of accumulated precipitation. In Portsmouth, Virginia, during the entire year, the rain falls for 151.9 days and collects up to 20.35" (517mm) of precipitation.Snowfall
April through October are months without snowfall.Ocean temperature
In July, the average ocean temperature is 78.3°F (25.7°C).Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.
Daylight
In Portsmouth, Virginia, the average length of the day in July is 14h and 23min.On the first day of the month, sunrise is at 5:50 am and sunset at 8:28 pm. On the last day of July, sunrise is at 6:10 am and sunset at 8:12 pm EDT.
Sunshine
The month with the most sunshine is July, with an average of 10.9h of sunshine.UV index
The months with the highest UV index are July and August, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 7 in July translates into this advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Alert! Sand and water increase UV exposure due to their reflective properties.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Portsmouth, VA
- Average high temperature in July: 86.4°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (45.9°F).
- Average low temperature in July: 73.6°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (34.7°F).
Average pressure in July
Portsmouth, VA
- Average pressure in July: 29.98"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in July
Portsmouth, VA
- Average wind speed in July: 8mph
The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity in July
Portsmouth, VA
- Average humidity in July: 74%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July and November (74%).
Average rainfall in July
Portsmouth, VA
- Average rainfall in July: 2.2"
The wettest month (with the highest rainfall) is August (2.52").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in July
Portsmouth, VA
- Average rainfall days in July: 17.4 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in July
Portsmouth, VA
- Average snowfall in July: 0"
The month with the highest snowfall is January (0.47").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in July
Portsmouth, VA
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in July
Portsmouth, VA
- Average sea temperature in July: 78.2°F
The best month for swimming (with the highest average sea temperature) is August (80°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).
Average daylight in July /
Average sunshine in July
Portsmouth, VA
- Average daylight in July: 14h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in July: 10h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in July
Portsmouth, VA
- Average sunshine days in July: 11.2 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is August (10.8 days).
Average UV index in July
Portsmouth, VA
- Average UV index in July: 7
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in July
Portsmouth, VA
- Average cloud cover in July: 26
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in July
Portsmouth, VA
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
