August weather forecastPortsmouth, VA
August
Weather in August
Portsmouth's coastal summer rolls into August with all its glory and warmth. Despite a slight drop in peak temperatures, August sustains July's dynamic summer weather pattern. The slight decrease in humidity, coupled with cooling sea breeze, subtly reveals the imminent approach of fall. Moreover, the sea temperature peaks, inviting individuals for delightful swims and water sports. August stands as a blend of summer and impending fall, giving the people of Portsmouth the best of both.Temperature
Portsmouth's average high-temperature in August is a moderately hot 84.7°F (29.3°C), marking an insignificant difference from the 86.4°F (30.2°C) of July. An average low-temperature of 73°F (22.8°C) is noted during the nights in August.Heat index
Throughout August, the heat index is calculated to be a hot 93.2°F (34°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.In terms of the heat index, values are set with light wind and shade conditions in mind. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Humidity
In August, the average relative humidity is 75%.Rainfall
The month with the most rainfall is August, when the rain falls for 16.9 days and typically aggregates up to 2.52" (64mm) of precipitation.Snowfall
In Portsmouth, snow does not fall in April through October.Ocean temperature
With an average ocean temperature of 80.1°F (26.7°C), August is the month with the warmest seawater.Note: Water temperatures from 77°F (25°C) to 84.2°F (29°C) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.
Daylight
The average length of the day in August is 13h and 32min.On the first day of August, sunrise is at 6:11 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 7:34 pm EDT.
Sunshine
The average sunshine in August is 10.6h.UV index
July and August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 7 in August interprets into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Portsmouth, VA
- Average high temperature in August: 84.7°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 August: 73°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 August
Portsmouth, VA
- Average pressure in August: 29.99"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 August
Portsmouth, VA
- Average wind speed in August: 7.5mph
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 August
Portsmouth, VA
- Average humidity in August: 75%
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 August
Portsmouth, VA
- Average rainfall in August: 2.52"
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 August
Portsmouth, VA
- Average rainfall days in August: 16.9 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 August
Portsmouth, VA
- Average snowfall in August: 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 August
Portsmouth, VA
- Average snowfall days in August: 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 August
Portsmouth, VA
- Average sea temperature in August: 80°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 August /
Average sunshine in August
Portsmouth, VA
- Average daylight in August: 13h and 30min
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 August: 10h and 36min
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 August
Portsmouth, VA
- Average sunshine days in August: 10.8 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 August
Portsmouth, VA
- Average UV index in August: 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 August
Portsmouth, VA
- Average cloud cover in August: 29
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 August
Portsmouth, VA
- Average visibility in August: 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).
