Weather & seasons · last checked 26 July 2026
Andaman weather and temperature, month by month: what actually happens
Most guests arrive with one wrong idea — that June and July mean non-stop monsoon rain across the Andaman & Nicobar Islands. What actually happens: air stays 23–31°C all year, the sea holds 27–29°C, and the islands get sudden tropical thunderstorms, not weeks of drizzle — in our experience, only 5–6 genuinely disruptive weather days in a typical May–August season. A storm's real cost is a cancelled ferry and murky snorkelling water, not a ruined trip. This page is the weather picture we give our own guests, with the numbers we plan around.
The numbers we plan around
5–6 days
Genuinely disruptive weather days in a typical May–August season — in our experience running trips through it, as of 2026. Not five to six weeks.
23–31°C
The year-round air temperature band across the Andaman & Nicobar Islands; the sea holds 27–29°C. No month is cold — the variables here are rain and sea state, never temperature.
Dec 15 – Jan 15
The hotel surcharge window. December's weather is lovely — and September's is close to it at a fraction of the price.
Andaman temperature by month
The short answer: the Andaman & Nicobar Islands sit between 22°C and 32°C all year, and the sea holds 27–29°C. No month is cold, and no month is genuinely unbearable — April and May are the warmest (up to 32°C), December and January the coolest at night (down to 22°C). Temperature is almost never the reason to pick one month over another here; rain and sea state are.
| Month | Night low | Day high |
|---|---|---|
| January | 23°C | 29°C |
| February | 24°C | 30°C |
| March | 25°C | 31°C |
| April | 25°C | 32°C |
| May | 25°C | 32°C |
| June | 24°C | 30°C |
| July | 24°C | 30°C |
| August | 24°C | 30°C |
| September | 24°C | 30°C |
| October | 24°C | 30°C |
| November | 25°C | 30°C |
| December | 25°C | 30°C |
Typical ranges, not records — humidity sits high year-round, so 31°C in April feels warmer than the number suggests, and an overcast monsoon afternoon feels cooler. Sea temperature stays 27–29°C in every month, which is why the water never feels cold even in December.
Every month, honestly rated
Temperatures barely move all year. What changes is rain, the sea, and what your money buys. The verdicts are ours — the same ones we give on the phone.
One thing peak-season visitors get wrong: December is calm, but it is not the flattest sea of the year — it still carries the tail of the northeast monsoon. The genuinely glass months are February to April, once the crowds have thinned. That is the same argument our verdict column makes about price, arriving from the other direction. The month-by-month wave figures behind this sit on our sister site's Andaman sea conditions data, built from ten years of readings.
| Month | Temp | Rain | Sea | Crowds & prices | Our verdict |
|---|---|---|---|---|---|
| January | 23–29°C | Low | Calm | High · peak prices | Excellent — book 60–90 days out |
| February | 24–30°C | Very low | Calm | High | Excellent — clearest water |
| March | 25–31°C | Low | Calm | Medium | Very good, warming up |
| April | 25–32°C | Low–medium | Flattest of the year | Medium, easing | Good — hot afternoons, glass sea |
| May | 25–32°C | High | Rough spells | Low · budget rates | Fine if flexible — see monsoon notes |
| June | 24–30°C | High (thunderstorms) | Rough spells | Low | Doable with buffer days |
| July | 24–30°C | High (thunderstorms) | Rough spells | Low | Doable with buffer days |
| August | 24–30°C | High | Rough spells | Low | Doable with buffer days |
| September | 24–30°C | Easing | Improving | Low · good rates | Our pick — with October |
| October | 24–30°C | Medium, easing | Calming | Low–medium | Our pick — weather, rooms & airfares align |
| November | 25–30°C | Low · ~16 dry days | Calm | Medium | The value pick — near-December weather, pre-surcharge |
| December | 25–30°C | Lowest · ~21 dry days | Calm, not the flattest | Very high · surcharges | Driest month — and priced like it |
Climate figures are typical ranges for the islands; verdicts reflect how we advise our own guests. Peak-season ferry and hotel inventory genuinely sells out — for December–January, book 60–90 days ahead.
What each month costs is its own story — the season-by-season price picture is on the month-by-month verdict page, and the full per-person breakdown on the trip cost page.
The two rules we give every guest
Arriving
Land in Port Blair and stay the first night. A guest recently missed Havelock entirely because his flight arrived late in bad weather — a same-day flight-to-ferry connection is the most fragile plan in the Andamans. Day one Port Blair, day two Havelock.
Leaving
Keep a buffer day in Port Blair before your flight home. The question we're asked most on WhatsApp is whether the return crossing from Havelock or Neil can get disrupted — it can, so we never schedule it against a flight.
Every plan on our day-by-day itineraries page has both rules already built in.
May to September, without the brochure gloss
The southwest monsoon runs May to September. On the ground that means green islands, empty beaches, budget prices — and a handful of days when the sea says no. Ferries sail on most days — we published the actual cancellation numbers from 29,000 bookings so you don't have to take our word for it. One thing that surprises people: across 35 years of storm records, no cyclone has ever passed close to Port Blair during the monsoon — this is the wettest season and the only storm-free one. The Port Blair rain gauge also records about ten dry days in a typical July, rather than the near-zero most forecast apps imply. When it rains, crossings get uncomfortable and snorkelling visibility drops. Glass-bottom boat rides and some water activities pause on rough days. Everything else — hotels, sightseeing, Cellular Jail, the beaches themselves — carries on. Pack for it with the what-to-wear guide and the season is genuinely pleasant.
When a crossing does get cancelled, this is the job: rework the day, hold the itinerary together, and get the refund moving. Guests have described it better than we can —
“The tour guide Rohit did a fabulous job coordinating the trip despite the ferries being cancelled by the operator, alternate arrangement was done on time to keep the trip on track.”
— Arjun, August 2019, 5★ Google review
And sometimes the honest answer is to change the plan before the trip starts. In October 2023, with rain wrecking the road north, we advised a family travelling with a 2½-year-old to drop Diglipur altogether and rebuilt their itinerary three days before departure. They kept their holiday; we lost a booking segment. That trade is the point.
Turn the weather into a plan
Asked constantly, answered straight
What is the temperature in the Andaman and Nicobar Islands?
Between about 22°C and 32°C, all year round. Night lows sit around 22–25°C and day highs around 28–32°C depending on the month, and the sea holds 27–29°C in every season. April and May are the warmest months (highs near 32°C); December and January are the coolest at night (lows near 22°C). There is no cold season and no month where temperature alone should decide your dates — what actually changes month to month is rain and sea state.
Which is the hottest month in the Andamans?
April and May, with day highs around 32°C. It is the humidity rather than the number that people feel — afternoons in April are sticky, and this is when guests are gladdest of a morning-swim, rest-in-the-afternoon rhythm. It is still a perfectly good time to travel; you simply plan the day around the heat instead of through it.
What is the sea temperature in the Andamans?
27–29°C year-round — bath-warm by most visitors' standards, and one of the reasons the snorkelling and diving here are so comfortable. You will not need a wetsuit for warmth in any month, including December and January. What varies is not the water temperature but the visibility, which is best when the sea is calm from roughly November through April.
Is it always raining in Andaman in June and July?
No — and this is the thing guests get wrong most often. The islands don't sit under a week-long monsoon curtain; they get sudden tropical thunderstorms that pass. The real cost of a storm is a cancelled or uncomfortable ferry crossing and murky water for snorkelling or diving — not a washed-out holiday. In our experience, May to August brings roughly 5–6 genuinely disruptive weather days in a season.
What is Andaman weather like in October?
October is one of our two favourite months (with September): the sea is calming, hotels still have availability, airfares are reasonable, and the December surcharges are two months away. Day temperatures sit around 24–30°C. Our full month guide — what is open, what it costs, how Diwali week runs — is on the Andaman in October page.
Is December a good month to visit?
The weather is genuinely the best of the year — calm seas, 25–30°C, and about 21 dry days in a typical month according to the Port Blair gauge, more than any other month manages. It is also the most expensive month on the islands: hotels apply peak-season surcharges from December 15 to January 15, and flights price accordingly. What that premium buys is a real but modest weather gain — November averages around 16 dry days with calm seas and no surcharge, and October about 13 for less again. So the honest verdict is not that December's weather is overrated, it is that December's price is. The crowd numbers, the surcharge window and when to book are on our Andaman in December page.
Can my return ferry from Havelock or Neil get disrupted before my flight?
This is the question we hear most on WhatsApp, and it's the right one to ask. Yes — rough weather can delay or cancel crossings back to Port Blair. Our standing rule: keep a buffer day in Port Blair before your flight home, and don't plan a same-day ferry-to-flight connection in either direction.
Does everything shut down in the monsoon?
No — and less closes than people fear. Ferries sail on most days, hotels and sightseeing operate normally, Elephant Beach stays open, and the islands are at their greenest. What does change is the water: water sports run limited rather than full through the monsoon, and boat activities are the first thing a rough morning takes out. Separately, and not a weather matter at all, Jolly Buoy and Red Skin work on a rotation — each is open around six months of the year — so which of the two you can visit depends on when you come. What changes most is predictability, which is why monsoon itineraries need slack built in.
What about cyclones?
Direct hits are rare, and the season is not the one most people expect. Across 35 years of NOAA best-track records, not a single tropical cyclone has passed within 300 km of Port Blair during June to September — the monsoon is the wettest part of the year and the only cyclone-free one. The systems come in October, November and December, with a smaller peak in April and May; November is the busiest month of all. What matters in practice is that the disruption radius is much wider than the damage radius: a storm 200 km away can leave Port Blair untouched and still stop the ferries. When a system is tracking near the islands we contact affected guests, rework the itinerary around the sea state, and rebook crossings — that's the practical protection of booking with an operator based in Port Blair. Our cyclone-season data page has the full month-by-month record.
How this page stays true
Written by the Tropical Andamans editorial team from operator field notes · reviewed for weather and ferry accuracy by our Port Blair operations team · last checked 10 July 2026. Seasonal figures (surcharge windows, disruption-day counts) come from our own operating records and are rechecked before every season — pre-monsoon (May) and pre-peak (September).
Tell us your dates.
We'll tell you what the sea is doing that month, what it costs, and whether we'd travel then ourselves — before you book anything.