Andaman weather in short
The Andaman Islands are warm all year. In Port Blair (Sri Vijaya Puram), the average daily high stays between 29.5 and 32.6 degrees Celsius and the average daily low between 22.7 and 24.9 degrees. Temperature changes little from month to month. Rain is what separates the seasons.
The figures below are long-term monthly averages for the Port Blair weather station for 1991 to 2020. They describe a typical year. They are not a forecast, and they do not apply exactly to every beach or island.
October to May is the preferred travel period and June to October is the time for monsoon tourism. Do not read that as one uniform dry season: rainfall is already high in May.
Andaman weather by month
Port Blair weather station, 79 m above sea level, averages for 1991 to 2020. Rain is the monthly total.
| Month | Daily high | Daily low | Rain |
|---|---|---|---|
| January | 29.9 °C | 23.0 °C | 48.9 mm |
| February | 30.6 °C | 22.7 °C | 14.2 mm |
| March | 31.7 °C | 23.4 °C | 32.7 mm |
| April | 32.6 °C | 24.7 °C | 78.0 mm |
| May | 31.5 °C | 24.9 °C | 407.2 mm |
| June | 30.0 °C | 24.6 °C | 484.2 mm |
| July | 29.6 °C | 24.2 °C | 448.5 mm |
| August | 29.5 °C | 24.2 °C | 460.2 mm |
| September | 29.5 °C | 23.7 °C | 505.2 mm |
| October | 30.2 °C | 23.8 °C | 300.9 mm |
| November | 30.5 °C | 24.3 °C | 221.8 mm |
| December | 30.1 °C | 23.9 °C | 111.4 mm |
For most visitors, the practical lesson is simple: January to March is the most reliable stretch for beaches, boat trips and ferry hops, and April is still fairly dry. If you can choose, aim for these months.
Our pick: a Havelock snorkeling session
Water trips depend on the sea, so check the forecast and the cancellation terms before you book.
Hand-picked tours, booked through GetYourGuide. Prices are indicative starting prices in US dollars (as of October 2026). Tap a tour for live availability and the current price in your currency.
Andaman tours and island trips
Island trips, boat tours, snorkeling and diving, with live prices and availability. Check the dates against the weather table above.
Best time to visit Andaman
There is no single best month, only a trade-off between rain, crowds and what you want to do. The monthly figures show three phases.
January to April: the driest months
January, February and March have the lowest rainfall of the year, and April is still modest at 78.0 mm. This is the easiest period for ferries, island hopping and days at the beach. If you plan a trip that depends on several boat transfers, these months give you the most reliable odds. Our Port Blair to Havelock ferry guide explains the routes and how to book.
May to September: the rainy months
Rainfall jumps sharply in May, to more than 400 mm, and stays above 440 mm through September. June to October is the period when activities and ferries on Havelock can be affected. Ferry timetables can be changed for weather or technical reasons, so a booked crossing is never guaranteed. If you travel in these months, keep your plans flexible and avoid tight connections.
October to December: the rain eases
Rainfall falls from 300.9 mm in October to 221.8 mm in November and 111.4 mm in December. These months are still wetter than January to March, so expect showers and check the forecast close to your dates.
Match the month to your plan
A route that depends on several ferries, such as Port Blair to Havelock, on to Neil and back, suits January to April best. A short stay built around Sri Vijaya Puram, the Cellular Jail and the museums is less sensitive to rain, because most of it happens in town. If you plan to snorkel or dive, read our guides to snorkeling in the Andamans and scuba diving before you fix dates. Our Andaman tour packages page shows what runs on the islands.
Andaman Islands weather in December
Andaman in December
December has far less rain than September: 111.4 mm against 505.2 mm. It is still wetter than February, which averages 14.2 mm, and it is not rain-free. You can have long sunny stretches and still get a shower.
If December is your only option, it works well for a trip that mixes beach days with sights. Book ferries and rooms early if you need fixed dates, and keep a spare day before an onward flight in case a crossing is changed.
December rain averages roughly 100 to 115 mm. It is a month with some rain, not a dry one.
Plan the rest of your trip
Ferry guide
Port Blair, Havelock and Neil, with sample times and what to know before booking.
Havelock Island
Beaches, activities and what the monsoon months change.
Scuba diving
Where first dives and courses happen around Havelock and Neil.
Radhanagar Beach
Sunset, swimming rules and opening hours.
Andaman weather: frequently asked questions
What is the best month to visit the Andaman Islands?
January to March is the driest stretch, with February the driest month at 14.2 mm of rain on average. April is still fairly dry. October to May is the preferred travel period.
When is the monsoon in the Andamans?
Rainfall rises sharply in May and stays high through September, with 505.2 mm in September on average. Exact start and end dates change from year to year, so do not plan around a fixed date.
Is December a good time for the Andamans?
December is much drier than September, with 111.4 mm of rain on average, but it is not dry. Expect mostly good days and some showers.
Are ferries cancelled in the rainy season?
Not on every wet day. Operators can change timetables for weather and technical reasons, so there is no guarantee. Keep a spare day around flights.
Do these figures apply to every island?
No. They are averages for the Port Blair weather station and do not give exact values for individual beaches or islands, nor a forecast for a given week.
How much does it rain in October?
On average 300.9 mm in Port Blair. The rain eases from October, falling to 221.8 mm in November and 111.4 mm in December.