What Humidity Changes About How Temperature Feels
Humidity does not change the current temperature. It changes how easily your body can cool itself at that temperature. The air can be 88 degrees in a dry afternoon and 88 degrees in a muggy one. The thermometer matches. The experience does not, because sweat evaporates quickly in dry air and slowly when the air is already holding a lot of moisture.
The desk shows relative humidity next to the wind and the feels-like value. Relative humidity is how full the air is compared with the most moisture it could hold at that temperature. Warm air can hold more moisture than cool air, so the same percentage means more actual water vapor on a hot day than on a cold one. That is why 60 percent on a summer afternoon feels heavier than 60 percent on a spring morning.
When the percentage starts to matter
At mild temperatures, humidity is mostly a comfort detail. At high temperatures, it is the difference between a hot day and a day when exertion heats you faster than you can cool. If the current temperature is already high and humidity is high, the feels-like number will sit above the air temperature. That gap is the signal to take the heat seriously: shade, water, and a slower pace. The page is not issuing a heat advisory. It is showing the two ingredients.
At cool temperatures, high humidity makes the air feel clammy, but the bigger comfort swing is usually wind. Dry cold can feel crisp. Damp cold can feel raw even at the same reading. Use humidity as a modifier, and still let the current temperature be the base.
What humidity does to the day itself
Moist air changes temperature more slowly overnight. Water vapor intercepts heat the ground is trying to radiate away, so a humid night often stays warmer than a dry, clear night with the same afternoon high. If today’s range from low to high is narrow and humidity is high, you are looking at that effect. A wide range and lower humidity usually mean the night can fall farther.
Humidity also frames rain, without being the same thing as rain chance. Sticky air can accompany a high rain chance, or it can just sit there under a hazy sky. Read the rain probability for whether showers are likely. Read humidity for how the current temperature will feel if it stays dry.
A simple check
Look at the current temperature. Look at humidity. If both are high, expect the feels-like value to run hotter, and plan the next few hours accordingly. If the temperature is moderate, humidity can stay in the background. If you are comparing two places, compare humidity only after you have compared the air temperature. A cooler, more humid town can feel similar to a warmer, drier one, which is exactly why both numbers are on the page.
None of this requires a second source. The desk already pairs the air temperature with humidity and with feels-like. Use the air temperature as the fact. Use humidity to explain why that fact may feel different from the last time you saw the same number.