Ranchi enjoys a humid subtropical climate (Köppen: Cwa), noted for being notably milder and more pleasant than the surrounding lowland regions.
Summer runs from March to May, with average daytime temperatures ranging between 20°C and 37°C (68°F to 99°F), though peak summer days can occasionally cross 40°C. The monsoon season, driven by the southwest monsoon, spans from June to September, bringing heavy and rejuvenating rainfall that averages around 1,430 mm annually. Winters (November to February) are crisp, cool, and highly pleasant, with temperatures commonly dipping to 5°C to 10°C (41°F to 50°F) at night.
The best time to visit Ranchi is between September and March, when the waterfalls are full from the recent monsoons and the weather is comfortably cool.