Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
The average high-temperature is a moderately hot 84.9°F (29.4°C) in August, hardly different from the 86°F (30°C) recorded in July. Despite drastic daily temperature oscillations, Portsmouth cools down to an average low-temperature of 62.1°F (16.7°C) in August.Heat index
During August, the heat index is evaluated at a fiery hot 95°F (35°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.Note that heat index values are valued for light wind and location in the shade. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.
Humidity
August is the least humid month, with an average relative humidity of 75%.Rainfall
In Portsmouth, in August, during 14.3 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. Throughout the year, there are 170.4 rainfall days, and 31.02" (788mm) of precipitation is accumulated.Snowfall
In Portsmouth, snow does not fall in May through September.Daylight
The average length of the day in August is 13h and 38min.On the first day of August, sunrise is at 6:34 am and sunset at 8:42 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 8:03 pm EDT.
Sunshine
With an average of 10.4h of sunshine, August has the most sunshine of the year.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 6 during August leads to these instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is August in Portsmouth?
What is the least humid month?
What is the average humidity in August?
How much does it rain in August?
When it does not snow?
What is the average length of the day in August?
What time are sunrise and sunset in August in Portsmouth?
What month has the most sunshine?
How many hours of sunshine does Portsmouth have in August?
What are the months with the highest UV index?
How high is the UV index in August?
Average temperature in August
Portsmouth, OH
- Average high temperature in August: 84.9°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in August: 62.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in August
Portsmouth, OH
- Average pressure in August: 30"Hg
The months with the highest atmospheric pressure are January and November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in August
Portsmouth, OH
- Average wind speed in August: 4.5mph
The windiest months (with the highest average wind speed) are January and February (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in August
Portsmouth, OH
- Average humidity in August: 75%
The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is August (75%).
Average rainfall in August
Portsmouth, OH
- Average rainfall in August: 2.28"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in August
Portsmouth, OH
- Average rainfall days in August: 14.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is November (10.5 days).
Average snowfall in August
Portsmouth, OH
- Average snowfall in August: 0"
The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Portsmouth, OH
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Portsmouth, OH
- Average daylight in August: 13h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in August: 10h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in August
Portsmouth, OH
- Average sunshine days in August: 13.9 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (10 days).
Average UV index in August
Portsmouth, OH
- Average UV index in August: 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).
Average cloud cover in August
Portsmouth, OH
- Average cloud cover in August: 30
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in August
Portsmouth, OH
- Average visibility in August: 5mi
The months with the highest visibility are March, April, June, October and November (6mi).
The months with the lowest visibility are January, February, May, July, August, September and December (5mi).
Portsmouth, Ohio, USA
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