American Samoa Weather in August

August marks the coolest point of the year in American Samoa, but you'll barely notice the difference. Average daytime highs hover around 28°C (82.4°F), with evenings dropping to a pleasant 23°C (37.4°F), perfect for balmy nights.

Humidity levels remain moderate to high, but the consistent ocean breeze helps keep things from feeling overly sticky.

Sea Temperature in August

Sea temperatures are at their lowest for the year in August, but "low" in the tropics means around27°C (80.6°F), still perfect for a dip, snorkel, or lazy float in the Pacific.

Winter in American Samoa still means plenty of daylight and blue skies. August enjoys an average of 12 hours of daylight per day, with sunshine hours typically around five hours making it one of the sunniest months of the year. It's a great time to explore beaches, hike the national park, or enjoy an ocean swim.

UV Levels During August

As August rolls in, UV levels start to climb again, averaging around 10 on the UV index around midday, considered very high. Sunscreen is essential! Use a high-SPF, reef-safe option and reapply regularly, especially if you're in and out of the water, see The Best Sunscreens for American Samoa + Sun Protection Tips.

Sunrise and Sunset During August

In August, American Samoa experiences about 12 hours of daylight each day.

• Sunrise: Around 6:39 am at the start of the month, shifting earlier to 6:23 am by the end
• Sunset: Around 6:09 pm early in the month, extending slightly to 6:13 pm later on

Although August falls during the dry season in American Samoa, that doesn't mean rain is off the radar. You can still expect the occasional tropical downpour, usually short-lived and often happening overnight leaving most days warm and sunny.

American Samoa sees an average of 146 mm (5.7 in) of rainfall during August, typically spread across just three days in the month.

The South Pacific cyclone season starts in November LINK#TT055 and ends in April. As such, August is one of the best months to avoid tropical cyclones in American Samoa with a very low risk of tropical storms developing.

Other months that have a low risk of tropical storms in American Samoa include June, July and September LINK#TT057. Find out more about tropical storms in our guide, Cyclone Safety in American Samoa LINK#TT030.

August is a fantastic time to explore American Samoa, with drier days and ideal temperatures making it perfect for getting outdoors. Tutuila, the main island, offers the most accessible experiences. It is home to Pago Pago Harbour, lush jungle hikes, hidden waterfalls and coastal villages steeped in local culture. Be sure to visit the National Park of American Samoa, where you can trek through pristine rainforest or snorkel in crystal-clear waters.

If you're seeking even more seclusion, consider a trip to the outer Manu'a Islands—Ofu and Ta'ū. These remote gems offer untouched white-sand beaches, vibrant coral reefs and a deep sense of peace far from the modern world. Ofu Beach, in particular, is often called one of the most beautiful in the entire South Pacific.

Whether you stick to the main island or venture further, American Samoa in August is all about breathtaking nature and laid-back island charm.

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

• Light clothing layers for the day (preferably linen, bamboo or merino so it is super light - we like the sustainable bamboo clothing of Moso Morrow)
• Light long-sleeved tops (to cover from sun and mosquitoes)
• Light pants/trousers/skirt (to cover the knees when appropriate – villages, 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.