How do temperature changes lead to solubility changes for salt dissolved in water?
High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.
High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.
High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.