American Samoa Weather in May

May in American Samoa signals the start of slightly cooler and less humid conditions compared to the earlier months of the wet season. That said, to visitors, it still feels distinctly tropical. Expect average daytime highs of around 84.2°F (29°C), with nighttime lows dipping to about 75°F (24°C), perfect for beach days and balmy island nights.

Humidity begins to ease slightly, making outdoor activities like hiking and exploring villages more comfortable, though it's still recommended to stay hydrated and seek shade during the hottest parts of the day.

Sea Temperature in May

American Samoa's coastal waters remain warm and welcoming year-round, and May is no exception. The average sea temperature hovers around 84°F (29°C), making it ideal for snorkelling, diving and swimming in coral-rich lagoons and reef-protected beaches.

As American Samoa shifts further into its drier season, May brings slightly shorter days, though "short" is relative in the tropics. You can still expect around 11 hours of daylight, with an average of seven hours of bright sunshine daily—a solid amount for beach hopping, snorkelling or scenic hikes around the islands.

UV Levels During May

UV levels remain very high, even as the year progresses. The UV index in American Samoa hovers around 9 at midday, which means sun protection is essential. For advice on sunscreen, take a look at The Best Sunscreens for American Samoa + Sun Protection Tips.

Sunrise and Sunset During May

May has daylight hours lasting about 11 hours a day in American Samoa.

• Sunrise: 6:27 am at the beginning of May and 6:35 am at the end of May
• Sunset: 6:02 pm at the beginning of May and 5:55 pm at the end of May

May marks the beginning of the drier season in American Samoa, but that doesn’t mean the rain disappears entirely. On average, the islands experience around 9 days of rainfall throughout the month. Showers are usually brief and heavy, often clearing up quickly to make way for sunshine, so you can still make the most of your beach days and hiking plans.

American Samoa receives an average of 7.8 in (198 mm) of rainfall in May, making it significantly drier than the peak wet season months. The lush landscapes are still vibrant, and waterfalls remain flowing, just with fewer interruptions from the weather.

It’s a great time to visit if you’re after that balance of tropical sunshine and cooler, more comfortable conditions.

In American Samoa, May signals the official end of the South Pacific cyclone season, which runs from November to April. That means the likelihood of a tropical storm or cyclone forming during this month is extremely low. Historically, American Samoa has not experienced any significant cyclone activity in May, making it one of the safer months weather-wise to visit the territory.

Still, it's always good practice to stay weather-aware when travelling in the tropics. Although the chance is slim, the occasional off-season disturbance can still form across the South Pacific. If you're travelling during this transitional time, it's worth brushing up on Cyclone Safety in American Samoa, just in case.

For those especially concerned about storm risk, the mid-year dry season, particularly June through August offers the most stable and predictable weather in American Samoa.

May is a great time to explore American Samoa, thanks to few tourists (which is standard all year round) and no big events or holidays that get locals moving around, creating an utterly relaxed atmosphere. The weather stays warm and tropical, with occasional quick showers that won't interrupt your plans too much. It's the ideal time to enjoy beaches, hiking and cultural sites all to oneself.

Tutuila – As the main island, Tutuila has most of the territory's attractions and services. In May, explore the National Park of American Samoa, swim at Fagatele Bay or hike to Blunts Point. Villages like 'Amanave and Vatia offer a quieter look into local life during the low season. Find out more about what Tutuila is all about in The Complete Travel Guide to Pago Pago & Tutuila.

Manu'a Islands – For a more remote experience, visit Ta'ū or Ofu-Olosega in the Manu'a Islands. These spots are perfect for solitude, snorkelling and untouched landscapes. May's calmer waters before the tradewinds pick up also make the trip easier. For more information, check The Complete Travel Guide to the Manu'a Islands.

Be prepared for American Samoa in May by packing these few seasonal essentials:

• Light clothing layer (linen, bamboo or merino preferably so it is super light - we like the sustainable bamboo clothing of Moso Morrow)
• Light long-sleeved tops (to cover from the sun and take the edge off those slightly cooler nights)
• Light pants/trousers (to cover the knees when appropriate – in villages or church services or to protect from mosquitoes when hiking, for example)
• Sunhat
• Sunglasses
• Swimwear
• Rash vest (we like the UV-protecting Sharkskin rashies)
• Closed walking shoes
• Flip-flops/jandals/sandals
• Insect repellent
• High-factor sunscreen (that's reef-safe and water-resistant).

Get more ideas on what to pack with our guide, What to Pack for American Samoa: Full American Samoa Packing List.