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Port Blair, the capital of the Andaman and Nicobar Islands, sits at latitude 11.67°N in the Bay of Bengal. The city has a tropical monsoon climate with temperatures that barely move: daytime highs stay between 29°C and 32°C (84°F to 90°F) every month, and nights rarely drop below 23°C (73°F). What changes through the year is rain. Port Blair receives about 3,180 mm of rainfall annually, most of it between May and December. Humidity runs 70 to 85% year round. For a month by month breakdown, see the best time to visit Port Blair guide. See our Port Blair travel guide for an overview of the city.
Port Blair Weather by Month: Temperature and Rainfall Table
| Month | High | Low | Rainfall | Sea |
|---|---|---|---|---|
| January | 29°C / 84°F | 23°C / 73°F | 35 mm | 27°C / 81°F |
| February | 30°C / 86°F | 23°C / 73°F | 25 mm | 27°C / 81°F |
| March | 31°C / 88°F | 24°C / 75°F | 40 mm | 28°C / 82°F |
| April | 32°C / 90°F | 25°C / 77°F | 70 mm | 29°C / 84°F |
| May | 31°C / 88°F | 25°C / 77°F | 380 mm | 29°C / 84°F |
| June | 29°C / 84°F | 24°C / 75°F | 620 mm | 28°C / 82°F |
| July | 29°C / 84°F | 24°C / 75°F | 600 mm | 28°C / 82°F |
| August | 29°C / 84°F | 24°C / 75°F | 570 mm | 28°C / 82°F |
| September | 29°C / 84°F | 24°C / 75°F | 500 mm | 28°C / 82°F |
| October | 29°C / 84°F | 24°C / 75°F | 320 mm | 28°C / 82°F |
| November | 29°C / 84°F | 24°C / 75°F | 210 mm | 28°C / 82°F |
| December | 29°C / 84°F | 23°C / 73°F | 80 mm | 27°C / 81°F |
Port Blair Weather by Month: December to March
December through March is the dry season and the best stretch of the year. December averages 80 mm of rain and March only 40 mm, so most days are sunny with highs around 29°C to 31°C (84°F to 88°F). Sea conditions are calm enough for ferries and diving. This is when you should book the things to do in Port Blair without rain interruptions. Nights cool to a comfortable 23°C (73°F).
Port Blair Weather by Month: April and May
April is the hottest month, with highs reaching 32°C (90°F) and humidity climbing above 80%. Rain is still modest in April (70 mm) but May brings the first monsoon bursts at 380 mm. April works if you plan around the midday heat; May is a transition month where afternoon downpours become common and sea crossings can get choppy. This is a good window for budget travel if you check ferry schedules in advance. For the annual event calendar, see our events and festivals in Port Blair.
Port Blair Weather by Month: June to September Monsoon
The southwest monsoon peaks from June to August, when Port Blair receives 570 to 620 mm of rain per month. Expect heavy, sustained rain, overcast skies, and rough seas. Many dive operators pause scuba trips and some ferries to Havelock are cancelled or rescheduled. If you travel in these months, plan flexible itineraries and check ferry status daily. Temperatures stay mild at 29°C (84°F), but the humidity makes it feel hotter. For hotel options that work in wet weather, see where to stay in Port Blair.
Port Blair Weather by Month: October and November
October and November sit in the northeast monsoon, a second rainy season that is lighter than the southwest one. October averages 320 mm and November 210 mm, usually as late-evening or overnight showers rather than all-day rain. November is a shoulder month: prices are lower than December but the weather has mostly cleared by mid-November, making it a solid choice for a first visit. where each area sits and who it suits is covered in our Port Blair neighborhoods guide.
Port Blair Weather by Month: Sea Temperature and Diving
Sea temperatures around Port Blair hold between 27°C and 29°C (81°F to 84°F) all year, so the water is never cold. Underwater visibility is best from January to April, at 15 to 30 metres, and drops in the monsoon when sediment clouds the water. The dive season runs December to April, with March and April offering the warmest water at 29°C. See the Port Blair travel tips for ferry and dive booking advice.
