Humidity Levels in Pennsylvania During September





The average humidity in September is listed below for places in Pennsylvania. The tables give daily averages along with highest and lowest 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.

All the numbers here are averages for the years 1961 to 1990.

Average Humidity

In this table, the Daily number is the average of humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon measures are for 4 pm local standard time.

Average relative humidity (%) in September
Daily Place Morning Afternoon
74 Allentown 88 56
75 Erie 82 64
74 Harrisburg 86 57
72 Philadelphia 83 55
72 Pittsburgh 86 55
75 Wilkes-Barre & Scranton 88 59
79 Williamsport 92 58

Highest and Lowest Humidity

Below are the averages during September for maximum and minimum humidity levels in Pennsylvania. The hours when this month's highest and lowest humidity readings usually occur are given in local standard time.

Daily high and low relative humidity (%) averages in September
High Time Place Low Time
88.5 4 am Allentown 56.1 4 pm
82.1 7 am Erie 64.2 4 pm
86.7 4 am Harrisburg 56.8 4 pm
84.5 4 am Philadelphia 55.3 4 pm
85.7 7 am Pittsburgh 55.1 4 pm
87.9 7 am Wilkes-Barre & Scranton 58.9 4 pm
92.3 4 am Williamsport 58.2 4 pm
Reference

World Data Center for Meteorology. Climate of the World.

Pennsylvania Humidity
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