This is the 978th most frequent Portuguese word.
aumenta
"Increase" or "raises" (third-person singular of the verb "aumentar").
Here, 'aumenta' is used to describe an increase in a physical condition or quantity, specifically temperature, showing a natural progression of change.
O calor aumenta durante o verão.
The heat increases during summer.
In this sentence, 'aumenta' indicates an action performed deliberately to raise or increase a specific financial rate.
O banco aumenta as taxas de juros mensalmente.
The bank raises the interest rates monthly.
This usage of 'aumenta' explains adjusting or making a deliberate increase in sound level.