Diamond Harbour experiences a humid subtropical climate with distinct seasonal variations. In winter, January and December are relatively cooler months, with temperatures ranging from 11-31°C and 12-37°C respectively. As summer approaches, March to May witness rising temperatures, reaching up to 39°C, while June and July see slightly lower highs around 38°C. Autumn brings a slight dip in temperature, with September and October experiencing lows of around 18°C and highs of 35°C. The winter months are followed by a short spring-like period before the onset of monsoon rains, resulting in mild temperatures ranging from 22-32°C during November.