Relative Humidity in Phoenix, AZ
The average annual humidity is 36%.
Local Climate Profile
Phoenix lies in the Sonoran Desert. It has exceptionally low humidity year-round, except during the late summer 'monsoon' season.
In Phoenix, AZ, the relative humidity fluctuates throughout the day. It is generally highest in the early morning, averaging 48% when the air is cool. As the sun heats the air throughout the day, the relative humidity naturally drops, reaching an average of 23% by the late afternoon.
Managing Indoor Comfort in Phoenix, AZ
Because outdoor weather directly impacts your indoor environment, residents of Phoenix, AZ must actively manage their home's humidity to stay within the ideal 30% to 60% range.
Since the local average is quite low, you may need to use humidifiers during the driest months to prevent dry skin, irritated sinuses, and damage to hardwood floors.
Use the Calculator
If you have a hygrometer in your home, plug your current indoor temperature and humidity into the calculator above. It will instantly tell you the Dew Point and give you a comfort score!