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Galactic winds are crucial to the cosmic cycle of matter, transportingmaterial out of the dense regions of galaxies. Observations show thecoexistence of different temperature phases in such winds, which is not easy toexplain. We present a set of 3D shock-multicloud simulations that account forradiative heating and cooling at temperatures between $10^2\,\rm K$ and$10^7\,\rm K$. The interplay between shock heating, dynamical instabilities,turbulence, and radiative heating and cooling creates a complex multi-phaseflow with a rain-like morphology. Cloud gas fragments and is continuouslyeroded, becoming efficiently mixed and mass loaded. The resulting warm mixedgas then cools down and precipitates into new dense cloudlets, which repeat theprocess. Thus, radiative cooling is able to sustain fast-moving dense gas byaiding condensation of gas from warm clouds and the hot wind. In the ensuingoutflow, hot gas with temperatures $\gtrsim 10^6\,\rm K$ outruns the warm andcold phases, which reach thermal equilibrium near $\approx 10^4\,\rm K$ and$\approx 10^2\,\rm K$, respectively. Although the volume filling factor of hotgas is higher in the outflow, most of the mass is concentrated in dense gascloudlets and filaments with these temperatures. More porous multicloud layersresult in more vertically extended outflows, and dense gas is more efficientlyproduced in more compact layers. The cold phase is not accelerated byram-pressure, but, instead, precipitates from warm and mixed gas out of thermalequilibrium. This cycle can explain the presence of high-velocity H\,{\sc i}gas with $N_{\rm H\,{\scriptstyle I}}=10^{19-21}\,\rm cm^{-2}$ and $\Deltav_{{\rm FWHM}}\lesssim37\,\rm km\,s^{-1}$ in the Galactic centre outflow.

Shock-multicloud interactions in galactic outflows -- II. Radiative fractal clouds and cold gas thermodynamics