World humidity map

Relative humidity two metres above the ground, in percent. Low values mean dry air, high values mean air close to saturation. Slide through the forecast to see humid air spread and dry air return.

© OpenStreetMap contributors · NASA · GEBCO · Natural Earth · GeoNames · NOAA GFS · GEFS-Aerosols

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World humidity map

Relative humidity tells you how much water vapour the air holds compared with the most it could hold at its current temperature. This map shows it at two metres above the ground, in percent, using the NOAA GFS forecast on a 0.25 degree grid.

A value near 100 percent means the air is almost saturated, and fog, dew or cloud can form. A value under 30 percent means very dry air, which is typical of deserts and of cold continental winters. Hover or tap to read the figure at any point.

Because relative humidity depends on temperature, it changes strongly over a day. Air that is nearly saturated at dawn can feel dry by mid-afternoon, even though the amount of water in it has not changed. Step through the forecast and notice the patterns follow the sun.

Tropical oceans and rainforests stay humid almost all the time, while the subtropical deserts are among the driest areas. Each forecast run covers 48 hours in 3-hour steps and the data is renewed four times a day.
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