The actual temperature of a location is determined by its humidity level. The Gulf Coast cities and Southeast U.S. cities together maintain their position as the hottest locations because they experience warm temperatures and their closeness to water bodies. The measurement of humidity requires the use of average relative humidity and dew point levels which demonstrate the stickiness of the air.
New Orleans
New Orleans stands as one of the United States most humid cities because its average relative humidity reaches 75 to 80 percent and its dew point levels remain elevated. Source: National Oceanic and Atmospheric Administration (NOAA climate data)
Houston
Houston maintains its high humidity levels throughout the entire year because the city experiences more than 70% humidity during all months but summer when the dew points reach 24 degrees Celsius. Source: NOAA & WeatherSpark
Miami
Miami maintains high humidity levels throughout the entire year because its tropical climate brings constant humidity which reaches 70 to 80 percent and offers no seasonal reduction. Source: NOAA & National Weather Service
Tampa
The combination of coastal humidity and temperature in Tampa results in extremely high dew point levels and permanent humidity conditions that exist from May until October. Source: NOAA climate normals
Orlando
Orlando experiences high humidity levels because of its inland location and continuous rain and subtropical weather patterns. Source: NOAA & WeatherSpark
Jacksonville
Jacksonville maintains high humidity throughout the entire year because summer weather conditions bring summer weather which creates sticky air. Source: NOAA climate data
Mobile
Mobile consistently ranks among the most humid cities because it maintains average humidity at 75% and receives frequent rainfall which increases moisture levels in the city. Source: NOAA & National Weather Service
Baton Rouge
Baton Rouge experiences New Orleans weather conditions because both cities share extremely high dew points and humidity levels which reach their peak during summer. Source: NOAA climate statistics
Charleston
The coastal position of Charleston results in continuous humid conditions which combine with warm ocean breezes to create damp summer weather. Source: NOAA & WeatherSpark
Savannah
The humid subtropical climate of Savannah includes extended high humidity summers which bring excessive moisture during the nighttime hours. Source: NOAA climate normals
Important Notes on Data
The humidity rankings use both average relative humidity and dew point measurements together with temperature data. The National Oceanic and Atmospheric Administration and National Weather Service serve as the main sources for the data. Coastal and Gulf regions dominate because warm water interacts with air moisture.
