Average Summer Humidity by USA State

The average humidity during summer is listed here for each state in the United States. The tables give annual averages for morning and afternoon relative humidity levels.

The Morning humidity values for a state 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.

Since so few weather stations measure humidity, meaningful state-wide averages aren't available. Instead the tables list a place for each state that represents the state's typical humidity levels.

All of the numbers are averages of several decades of weather measurements. The summer averages are based on data for the months of June, July and August.