Winters in Rahway are cold and variable, with temperatures often below freezing but occasionally rising into the mid-teens. Spring brings a gradual warming trend, with temperatures increasing rapidly as the season progresses. Summer is warm but not hot, with highs rarely exceeding 35°C and overnight lows typically ranging from 14-16°C. Autumn is mild, with temperatures cooling gradually over the course of the season, although occasional heatwaves can still occur.