Average Relative Humidity in August at US Cities





The average humidity in August is listed here for the largest cities in the United States. The tables below give this month's daily averages along with morning and afternoon relative humidity levels.

Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.

For each city, the Daily number gives the average of humidity readings taken every three hours throughout the day. Morning values are recorded between 4 and 6 am local standard time, when usually temperatures are coolest and humidity highest. Afternoon humidity percentages are readings taken between 3 and 5 pm local standard time, when normally the day's temperature peaks and relative humidity reaches its lowest point. All the figures are averages for the years 1961 to 1990.

Average Relative Humidity (%) in August
Daily CityMorn­ing After­noon
75 Atlanta, Georgia 89 57
64 Austin, Texas 87 42
71 Baltimore, Maryland 85 55
75 Birmingham, Alabama 89 56
71 Boston, Massachusetts 82 61
72 Buffalo, New York 86 57
74 Charlotte, North Carolina 88 55
71 Chicago, Illinois 85 55
72 Cincinnati, Ohio 87 54
73 Cleveland, Ohio 86 59
73 Columbus, Ohio 88 55
60 Dallas, Texas 80 41
49 Denver, Colorado 69 35
72 Detroit, Michigan 87 54
71 Hartford, Connecticut 87 53
75 Houston, Texas 93 55
75 Indianapolis, Indiana 90 57
Daily CityMorn­ing After­noon
80 Jacksonville, Florida 93 67
70 Kansas City, Missouri 86 54
26 Las Vegas, Nevada 35 17
77 Los Angeles, California 85 68
72 Louisville, Kentucky 86 54
70 Memphis, Tennessee 85 54
76 Miami, Florida 86 67
75 Milwaukee, Wisconsin 87 62
68 Minneapolis, Minnesota 83 52
73 Nashville, Tennessee 90 54
79 New Orleans, Louisiana 92 66
66 New York, New York 77 54
62 Oklahoma City, Oklahoma 80 43
79 Orlando, Florida 93 66
70 Philadelphia, Pennsylvania 84 55
36 Phoenix, Arizona 51 23
71 Pittsburgh, Pennsylvania 86 54
Daily CityMorn­ing After­noon
65 Portland, Oregon 82 44
73 Providence, Rhode Island 86 59
78 Raleigh, North Carolina 93 59
77 Richmond, Virginia 92 58
74 Rochester, New York 89 57
56 Sacramento, California 78 29
39 Salt Lake City, Utah 54 23
65 San Antonio, Texas 86 44
74 San Diego, California 81 66
75 San Francisco, California 86 61
68 Seattle, Washington 83 50
70 St. Louis, Missouri 88 52
78 Tampa, Florida 90 66
75 Virginia Beach, Virginia 87 63
69 Washington, DC 83 55
Reference

World Data Center for Meteorology. Climate of the World.

US City Humidity
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