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Weather science

“Feels Like” Temperature: How It’s Calculated and Why It Differs

The “feels like” number blends temperature with humidity or wind to describe what your body actually experiences.
Last reviewed: 2026-07-17
“Feels Like” Temperature - illustration

One number, three formulas

The “feels like” (apparent) temperature on a weather app is not measured by any thermometer - it is computed. In hot weather it uses the heat index, which adds the effect of humidity. In cold weather it uses wind chill, which adds the effect of wind. In mild conditions (roughly 50–80°F), it usually just equals the air temperature.

That is why 95°F in humid Houston can “feel like” 108°F while 95°F in dry Las Vegas feels like 95°F - and why a 25°F day in windy Chicago can feel like 8°F.

What the feels-like number ignores

Apparent temperature assumes an average adult walking in the shade. It does not account for direct sunshine (add up to 15°F), your clothing, exertion level, hydration, or acclimatization. Runners, roofers, and cyclists should treat hot feels-like values as optimistic, not conservative.

Which number should you check?

A simple split settles it:

  • Use the actual temperature for things. Will pipes freeze? Will roads ice? Do plants need covering? Wind chill cannot push an object below the true air temperature.
  • Use the feels-like temperature for people and pets. What to wear, how long to stay out, and when to reschedule exercise.

Rule of thumb

Thermometers measure the air; feels-like measures you. When the two numbers disagree by more than a few degrees, trust the feels-like number for anything with a heartbeat. Compare the two numbers live in Chicago, Houston or Las Vegas - every city page shows both.

Humidex, WBGT and the other “feels like” systems

The heat index is not the only formula in the game:

  • Humidex (Canada) blends temperature with dew point rather than relative humidity. It runs a few degrees higher than the US heat index in the same air.
  • Apparent Temperature (Australia) adds wind into the hot-weather math, so a sea breeze legitimately lowers the number.
  • WBGT (wet-bulb globe temperature) adds direct sun and is the standard for athletics, the military and OSHA work-rest rules - it is the number that cancels football practice.

They disagree because they model different bodies doing different things - which is also why two weather apps can show different feels-like values for the same hour: each vendor picks its own formula and inputs.

Frequently asked questions

Why do two weather apps show different feels-like temperatures?
They use different formulas (heat index, humidex, proprietary blends) and different data feeds. The underlying air temperature usually matches; the “feel” is a modeling choice layered on top.
What is WBGT and why do sports use it instead of heat index?
Wet-bulb globe temperature combines heat, humidity, wind and direct sunshine - the full outdoor load on a working body. Heat index assumes shade, so athletic and occupational guidelines rely on WBGT thresholds instead.
Why is the feels-like temperature lower than the actual temperature?
Wind. Below about 50°F, moving air strips heat from your skin faster than calm air, so the wind chill formula produces a lower apparent temperature.
Why is the feels-like temperature higher than the actual temperature?
Humidity. Above about 80°F, moist air slows the evaporation of sweat, so the heat index produces a higher apparent temperature.
Can plants or pipes freeze when only the feels-like temperature is below 32°F?
No. Inanimate objects cannot be cooled below the actual air temperature. Freezing requires the real temperature to reach 32°F (0°C).