Keep your living space cooler by blocking out sunlight from coming through the windows, preferably using shading on the outside.

Make liberal use of fans, they lower perceived temperature by several °C.

Wear loose-fitting linen clothing.

Use hats that provide shade, like a cap or something with a larger brim.

Go for a swim.

Take a warm shower before bed (counterintuitive but helps in my experience).

Try to create a breeze through your home by opening windows on opposite sides of the home, when the temperature is higher inside than outside.

Use sunscreen.