Andaman Weather Month by Month: What to Expect Through the Year

The Andaman Islands enjoy a tropical climate with warm temperatures year-round, but the experience of the islands changes dramatically from month to month. Whether you are planning beach time, diving, trekking or a cultural getaway, knowing what to expect from the weather will help you choose the best month and pack smartly.

Climate at a glance

The Andamans lie in the Bay of Bengal and have a typically tropical maritime climate: hot and humid with a distinct monsoon season. Temperatures are fairly stable through the year, usually ranging from the low 20s°C at night to high 20s–low 30s°C by day. The most important variations are rainfall, wind and sea conditions:

• Dry season (roughly November to April): Clear skies, calmer seas and excellent visibility for water sports.
• Monsoon season (roughly May to October): Heavy rainfall, rough seas and occasional storms; fewer tourists and lush green landscapes.
• Shoulder months (April, October/November): Transitional periods with mixed conditions—often a good compromise for fewer crowds and acceptable weather.

Month-by-month breakdown

January

January is one of the best months to visit. Days are sunny and pleasantly warm, nights are comfortably cool, and humidity is lower than in summer. Sea conditions are calm with excellent visibility—ideal for diving, snorkeling and glass-bottom boat trips. Popular activities like island hopping, trekking in Mount Harriet and exploring historical sites around Port Blair are very enjoyable.

February

Similar to January, February offers stable, dry weather and warm seas. This is peak tourist season, so expect popular beaches and attractions to be busier. Whale watching and dolphin sightings can be good, and the underwater visibility remains excellent for scuba diving. Book accommodations and excursions in advance.

March

Temperatures begin to edge up as the islands move toward summer. March remains a favourable month for all outdoor activities—beach time, water sports and sightseeing. The sea stays relatively calm, but humidity starts to increase. Late March can see occasional pre-monsoon showers, especially in the northern islands.

April

April is a shoulder month: hotter days and rising humidity mark the onset of the monsoon. Afternoon showers become more common. Water visibility may start to decline later in the month, but early April still offers good conditions for diving, kayaking and island excursions. This month can be a good choice if you prefer fewer crowds and lower prices but still want mostly dry weather.

May

May heralds the start of the monsoon for practical purposes. Rain becomes frequent, sometimes heavy and accompanied by stronger winds. Sea conditions worsen, with choppy waters and reduced visibility for diving. Some ferry services and boat trips may be suspended during storms. Still, the islands are at their greenest, waterfalls swell, and birdlife becomes more active—appealing to nature lovers who do not mind wet weather.

June

June is firmly monsoon: persistent rain, cloud cover and high humidity are the norm. The seas are often rough, making inter-island travel less reliable. Many adventure operators reduce services or close for safety. If you travel in June, focus on Port Blair’s museums, local cuisine and cultural experiences, or choose a resort that manages indoor and sheltered activities.

July

July continues the monsoon pattern with heavy showers and windy conditions. Outdoor plans should be flexible because weather can change quickly. That said, the monsoon gives the islands a dramatic, wild beauty—lush forests, dramatic skies and near-empty beaches. Photographers and those seeking solitude may find this month appealing, but expect disruptions to water-based activities.

August

August is typically the wettest month. Constant rain, strong winds and rough seas make it less suitable for conventional island tourism. Many services run on limited schedules. It’s an offbeat choice for travellers seeking solitude or long-stay bargains, provided they accept weather-related limitations and take safety precautions.

September

September sees a gradual easing of the monsoon, with rain becoming less frequent toward the end of the month. The landscape remains verdant and waterfalls are at their best. Sea conditions slowly improve, but diving visibility may still be lower than during the dry season. Travel is quieter and prices may be lower.

October

October is transitional: showers decrease and skies begin to clear as the islands move out of the monsoon. By late October, conditions are often suitable for water activities again, though occasional rain can still occur. This month is increasingly popular with travellers who want to avoid peak-season crowds while enjoying improving weather.

November

November marks the start of the high season. Weather becomes drier, humidity drops slightly and sea conditions stabilise—visibility for diving improves considerably. This is a great month for outdoor adventures, with comfortable days and warm nights. Do book in advance if travelling around Diwali or general holiday periods, as demand rises.

December

December is a top month for visiting the Andamans: bright sunny days, gentle seas and cooling breezes make it perfect for island hopping, scuba diving and long beach days. Expect higher tourist numbers, lively restaurants and full ferry schedules. It’s ideal for celebrating the end of the year with sun and sand.

Sea conditions, diving and visibility

Diving visibility in the Andamans is best from November to April when calm seas and clear water reveal colourful coral reefs and abundant marine life. During the monsoon, visibility drops, surface currents can be stronger and many dive operators scale back. Boat transfers between islands are most reliable in the dry season; during the monsoon, small-boat services may be suspended for safety reasons.

What to pack, month-wise suggestions

• November–April: Lightweight cotton clothes, swimwear, reef-safe sunscreen, a light sweater for evenings, water shoes, snorkel gear if you have it, and a waterproof phone case.
• May–October: Quick-dry clothing, a good light rain jacket, a waterproof daypack, anti-fungal cream for humidity, insect repellent, and sturdy sandals. Expect wet shoes and extra washing.
• Year-round: Basic first-aid kit, motion-sickness tablets for ferries, strong sunscreen, and a power bank for longer trips to remote islands.

Festivals and events to consider

Culturally, the Andamans observe major Indian festivals according to the national calendar. Local events and community gatherings often occur around these times, offering an opportunity to experience island life. The high season coincides with many holidays, so if you wish to attend local events or avoid crowds, check festival dates while planning.

Practical travel tips

• Book flights and ferries well in advance for travel during November to March as services fill up quickly.
• Keep an eye on weather updates and sea forecasts during the monsoon; flexible itineraries reduce stress if trips are cancelled.
• Respect local restrictions: some tribal areas and uninhabited islands are off-limits to protect indigenous communities and fragile ecosystems. Check local permits and rules before planning visits to remote areas.
• Stay hydrated and protect yourself from sun and humidity—heat can feel more intense because of the humidity even when temperatures are moderate.

Tip: For the best balance of good weather, marine visibility and manageable crowds, target late October through March for your Andaman trip.

Health and safety considerations

Medical facilities on the principal islands like Port Blair are comfortable for routine care; however, advanced facilities may require evacuation to the mainland in rare cases. Carry a supply of essential medicines. During the monsoon, be cautious of slippery trails and sudden weather changes at sea. Mosquito protection is important year-round, particularly during and after rain when breeding increases.

Conclusion

The Andaman Islands offer something special every month: sun-soaked beaches and crystal-clear seas in the dry months, and dramatic, lush landscapes with solitude during the monsoon. Your ideal month depends on what you most want—perfect diving and beach weather, or quieter, greener islands. Use this month-by-month guide to pick the season that best fits your travel priorities and prepare accordingly for a memorable island experience.