The differences are from several factors. Typically humidity, wind, and cloud cover.
Think about it like this. If it was 80F, 95% humidity, completely still air, and no cloud cover, being outside would feel very hot and muggy.
If the same days was 80F, 30% humidity, steady breeze, and overcast, being outside would feel very comfortable.
The “feels like” temperature is just taking these things into account.
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