Cobalt chloride is fairly soluble in water.  Under atmospheric pressure, the mass concentration of a saturated solution of  in water is about 54% at the boiling point, 120.2 °C; 48% at 51.25 °C; 35% at 25 °C; 33% at 0 °C; and 29% at −27.8 °C.
Diluted aqueous solutions of  contain the species , besides chloride ions.  Concentrated solutions are red at room temperature but become blue at higher temperatures.