Planning for the weather is a good way to make your trip to Itanagar relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and September, with an average temperature of 26°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Itanagar are July, June, August and September, with each month seeing an average of 616 mm of rainfall.