In the Andamans, the main tourist season is from November to mid-May. However, the absolute peak season is between December and March.
The months from June to September are considered the rainy season. However, you can enjoy great off-season prices and discounts at many accommodations during this time period owing to the lesser tourist influx. In June and July, rain peaks and one can experience pleasant weather in the months of August and September with a little luck. The weather is highly unpredictable in the Andaman Islands. One can experience light showers even in November and December. It is quite tough to accurately predict the rain cycle as it is a tropical island.
If you are an adrenaline junkie, then you should know that for scuba diving, the best time to dive in the Andamans is February and March. During this time, visibility is excellent, the wind is almost absent, and the sea is at its flattest. From June 1 to July 31, the diving remains closed in Havelock Island and they reopen on August 1 for the new season.
The temperatures in Andamans during different months can be checked below:
Summers (April to June): 24°c - 37°c
Monsoon (May to September): 22°c - 35°c
Winter (December to February): 20°c - 30°c