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
Portsmouth's shift into August sets the average high-temperature at a still moderately hot 80.2°F (26.8°C), a figure that deviates only slightly from July's 82.6°F (28.1°C). Nighttime temperature in Portsmouth lowers to an average of 62.1°F (16.7°C) in August.Humidity
In Portsmouth, Iowa, the average relative humidity in August is 79%.Rainfall
In Portsmouth, during August, the rain falls for 12.3 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 113.5 rainfall days, and 15.71" (399mm) of precipitation is accumulated.Snowfall
In Portsmouth, snow does not fall in June through September.Daylight
In Portsmouth, the average length of the day in August is 13h and 48min.On the first day of the month, sunrise is at 6:17 am and sunset at 8:39 pm. On the last day of August, in Portsmouth, sunrise is at 6:47 am and sunset at 7:56 pm CDT.
Sunshine
In Portsmouth, the average sunshine in August is 9.8h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 6 in August converts into the following recommendations:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. 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. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
What are the temperatures in Portsmouth in August?
What is the average humidity in August in Portsmouth?
How many days does it rain in August in Portsmouth?
When it does not snow in Portsmouth?
What is the average length of the day in August in Portsmouth?
What time are sunrise and sunset in August in Portsmouth?
How many hours of sunshine does Portsmouth have in August?
What is the month with the highest UV index in Portsmouth?
What is the UV index intensity in August in Portsmouth?
Average temperature in August
Portsmouth, IA
- Average high temperature in August: 80.2°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).
- Average low temperature in August: 62.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in August
Portsmouth, IA
- Average pressure in August: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in August
Portsmouth, IA
- Average wind speed in August: 7.4mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in August
Portsmouth, IA
- Average humidity in August: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).
Average rainfall in August
Portsmouth, IA
- Average rainfall in August: 1.93"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in August
Portsmouth, IA
- Average rainfall days in August: 12.3 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in August
Portsmouth, IA
- Average snowfall in August: 0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Portsmouth, IA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Portsmouth, IA
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in August
Portsmouth, IA
- Average sunshine days in August: 15.5 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).
Average UV index in August
Portsmouth, IA
- Average UV index in August: 6
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in August
Portsmouth, IA
- Average cloud cover in August: 30
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in August
Portsmouth, IA
- 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).
Portsmouth, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location
