Itanagar experiences a humid subtropical climate (Köppen climate classification *Cwa*). The weather is highly influenced by its elevation and proximity to the Himalayas.
* **Summer (April to June):** Warm and humid, with temperatures ranging from 22°C to 35°C (71°F to 95°F). * **Monsoon (July to September):** The city receives heavy to very heavy rainfall during this period, often exceeding 2,500 mm annually. High humidity and frequent landslides are common. * **Winter (October to March):** Winters are cool and pleasant, making it the best time to visit. Temperatures range from 10°C to 22°C (50°F to 71°F), though nights can be chilly. Snowfall does not occur in the city itself, but is visible on the higher Himalayan peaks in the distance.