Abstract <p>A theoretical study has been carried out for the influence of relaxation processes in water on the intensity of the electromagnetic radiation of an oscillating charged water droplet, which is assumed to be viscous and incompressible. A theoretical analytical expression of the dispersion equation has been derived for an oscillating and radiating droplet, with this expression having the form of a complex fifth-power algebraic relation. The charge relaxation in an oscillating charged water droplet affects the intensity of its electromagnetic radiation due to the conductivity of water. The highest electromagnetic radiation intensity is inherent in an ideally conducting liquid droplet. It is an order of magnitude higher than the radiation intensity of a liquid droplet with a finite conductivity. The lowest radiation intensity is inherent in a droplet of a dielectric liquid with a frozen-in charge. The surface tension relaxation affects the electromagnetic radiation of a charged oscillating droplet by disordering surface water molecules and altering the magnitude of the surface tension coefficient. The relaxation of water viscosity has no substantial effect on the damped capillary oscillations and electromagnetic radiation of cloud droplets.</p>