The Andaman Islands have a tropical climate. There is medium to heavy rain during the monsoon, in the months from May to mid September and November to mid December.
The Islands are a tropical delight with mean minimum temperature at 230 C (75 - 85 F) and maximum at 280 C (78 - 95 F). The relative humidity on the islands is about 70% to
90% with a gentle breeze blowing all the time.
The Rainy Season
The weather is generally pleasant with average annual rainfall of 3,000 mm at Port Blair . The rainy season happens twice a year under the influence of Southwest monsoon in mid-May to September, and Northeast monsoon in November To January.
In Nicobar Island rainy season dominates round the year, with the region getting most of its rain in the month of June. It's quite hot in the months of March to May in the Andamans.
One can visit these islands in between the months of October to May; however, November To March is a much preferable time.
Minimum Temperature: 230 C (75 - 85 F)
Maximum temperature: 280 C (78 - 95 F)
Annual Rainfall: 3,000 mm
The climate remains tropical throughout the year with temperatures varying between 24°C and 35°C. Due to the incessant sea breeze; Andamans has very humid weather. The southwest monsoon touches the Indian soil first in the Andamans and then proceeds towards the mainland.
From mid-May to October, heavy rains flush the islands, often bringing violent cyclones that leave the west coast beaches strewn with fallen trees.
In November and December less severe rains arrive with the northeast monsoon.
Southindiatourtravel.com provides information on Climate in Andaman and different climatic features of Andaman climate
