Average humidity in Portland (ME)
The mean monthly relative humidity over the year in Portland (Maine), the United States of America.
- On average, September is the most humid month, at 77.0%.
- On average, February is the least humid month, at 65.0%.
- The average annual percentage of humidity is 71%.
Weather Forecasts for Portland (ME)
overcast and rain
broken clouds and no rain
almost clear and no rain