Naharlagun experiences a humid subtropical climate (Köppen climate classification Cwa), heavily influenced by the Himalayan foothills and the South-West Monsoon.
* **Summer (March to May):** Warm and highly humid, with temperatures ranging from 22°C to 34°C. Pre-monsoon showers are common. * **Monsoon (June to September):** The region receives torrential rainfall, often leading to localized flooding and landslides. Humidity is near 100%, and temperatures hover between 24°C and 30°C. * **Winter (November to February):** Winters are mild, cool, and highly pleasant. Temperatures range from 10°C to 22°C. Fog is common in the early mornings, especially near the river. * **Best Time to Visit:** October to April, when the weather is dry, cool, and the skies are clear, offering beautiful views of the surrounding hills.