Upolu, Samoa – a tiny palm-topped islet in a turquoise reef lagoon, framed by coconut palms
Samoa · South Pacific

Upolu Sea Temperature Today

Sea
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Air
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Beach day
⁦23–28°C⁩

The sea temperature at Upolu today is 26.7 °C / 80 °F – refreshing to pleasantly warm water, ideal for most people. The usual October average is 28.1 °C / 83 °F. Over the last 30 days the sea temperature has held at around 26.7 °C. Swimmable all year – the sea averages 27 °C or more in every month. Source: Sea Temp Map (seatempmap.com) – NASA MUR satellite data and the Copernicus Marine sea forecast.

Last updated ·

Climate · monthly averages

Sea temperature by month

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.

Warmest in April (29.5°C). Coldest in August (27.8°C). Swimmable all year – the sea averages 27 °C or more in every month.

Upolu, Samoa

The sea temperature at Upolu today is 26.7 °C (80 °F) – refreshing to pleasantly warm water, ideal for most people. The usual October average is 28.1 °C. Over the last 30 days the sea temperature has held at around 26.7 °C. Swimmable all year – the sea averages 27 °C or more in every month. Source: Sea Temp Map (seatempmap.com) – NASA MUR satellite data and the Copernicus Marine sea forecast.


Sea temperature by month – Upolu
MonthMinAvgMax
January29.0°C / 84.2°F29.3°C / 84.7°F29.6°C / 85.3°F
February29.1°C / 84.3°F29.3°C / 84.7°F29.6°C / 85.2°F
March29.2°C / 84.5°F29.4°C / 84.9°F30.0°C / 85.9°F
April29.1°C / 84.4°F29.5°C / 85.1°F30.1°C / 86.2°F
May29.0°C / 84.2°F29.2°C / 84.5°F29.6°C / 85.2°F
June28.5°C / 83.3°F28.7°C / 83.7°F29.0°C / 84.1°F
July28.0°C / 82.5°F28.2°C / 82.8°F28.4°C / 83.0°F
August27.5°C / 81.4°F27.8°C / 82.1°F28.2°C / 82.8°F
September27.6°C / 81.7°F27.9°C / 82.1°F28.1°C / 82.5°F
October27.9°C / 82.3°F28.1°C / 82.6°F28.2°C / 82.8°F
November28.4°C / 83.0°F28.6°C / 83.4°F28.8°C / 83.8°F
December28.8°C / 83.9°F29.0°C / 84.2°F29.2°C / 84.6°F

Air temperature by month – Upolu
MonthMinAvgMax
January25.4°C / 77.7°F26.3°C / 79.4°F27.2°C / 81.0°F
February25.3°C / 77.5°F26.1°C / 79.1°F26.9°C / 80.5°F
March25.5°C / 77.9°F26.5°C / 79.7°F27.5°C / 81.4°F
April25.6°C / 78.2°F26.5°C / 79.7°F27.3°C / 81.2°F
May25.5°C / 78.0°F26.3°C / 79.3°F26.9°C / 80.5°F
June25.0°C / 77.1°F25.8°C / 78.5°F26.6°C / 79.8°F
July24.7°C / 76.5°F25.5°C / 77.8°F26.2°C / 79.1°F
August24.4°C / 76.0°F25.2°C / 77.4°F26.1°C / 78.9°F
September24.5°C / 76.0°F25.4°C / 77.8°F26.3°C / 79.4°F
October24.7°C / 76.5°F25.6°C / 78.1°F26.3°C / 79.4°F
November24.9°C / 76.9°F25.9°C / 78.6°F26.7°C / 80.0°F
December25.2°C / 77.3°F26.2°C / 79.1°F27.1°C / 80.7°F

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes. (Copernicus ERA5)

Upolu holidays

Samoa's capital, Apia, and its international airport are both on Upolu, the more populous of the country's two main islands in the South Pacific. Villages of open-sided houses called fale, reef-fringed beaches and a mountainous, forested interior make up most of the island, which is about 75 km long.

Beaches

The south and east coasts of Upolu have the island's best-known beaches. Lalomanu, at the eastern tip, is a curve of white sand facing Nu'utele island, with simple beach fales for overnight stays. On the south coast, the lagoon at Maninoa and Siumu is sheltered by the reef and lined with resorts, and Return to Paradise Beach at Lefaga takes its name from a 1953 film shot on that beach. Many beaches belong to villages, which ask a small fee and expect modest behaviour, especially on Sundays. Near the village of Aufaga, a small palm-topped islet in the lagoon is the burial place of a village chief and is sacred, so visitors must not go onto it. The sea temperature on this page is measured in the lagoon off Aufaga, by this islet.

Things to do

To Sua Ocean Trench, near Lotofaga on the south coast, is a deep swimming hole linked to the sea, reached by a long wooden ladder. Near Apia, the Robert Louis Stevenson Museum occupies Villa Vailima, the house where the Scottish writer lived in the early 1890s, and a steep trail leads to his grave on Mount Vaea. Palolo Deep Marine Reserve, just east of Apia, lets snorkellers swim from the shore to a deep hole in the reef. Other sights include Papase'ea Sliding Rocks, Piula Cave Pool and the waterfalls along the Cross Island Road, and ferries from Mulifanua cross to Savai'i, Samoa's larger and quieter island.

Weather and best time to visit

At Upolu the sea stays above 27 °C / 81 °F all year, even in the coolest month.

Upolu is warm and humid all year. May to October is the drier and more comfortable season, with trade winds from the south-east. November to April is the wet season, with heavy showers and the risk of tropical cyclones. In December 2011 Samoa moved to the west side of the International Date Line, so it now shares its calendar day with New Zealand and Australia.

Hotels and where to stay

Apia has hotels close to the harbour, markets and government buildings, while beach resorts are spread along Upolu's south and east coasts, from Lefaga to Maninoa and Siumu, and around the north-west coast near Faleolo. Beach fales at Lalomanu and along the south coast offer simple stays by the sand.

Signature hotels: Seabreeze Resort Samoa (Aufaga) · Sinalei Reef Resort & Spa (Maninoa) · Taumeasina Island Resort (Apia)

Airport and getting there

Faleolo International Airport (APW), on the north-west coast of Upolu, is reached through Pacific hubs such as Auckland, Brisbane and Nadi; check current routes and whether your journey needs a connection. Apia is roughly 45 to 60 minutes away by road, and transfer times to the south coast resorts vary, so confirm them with your accommodation. Car ferries leave from Mulifanua wharf, near the airport, for Savai'i.

Frequently asked questions

Is the sea at Upolu warm enough for swimming today?

Today, October 29, the sea at Upolu is 26.7 °C (80 °F) – refreshing to pleasantly warm water, ideal for most people. The usual October average is 28.1 °C / 83 °F.

What is a good sea temperature for swimming?

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C / 55 °F only for cold-water swimmers, 13–18 °C / 55–64 °F icy, 18–23 °C / 64–73 °F cold to refreshing, 23–28 °C / 73–82 °F refreshing to pleasantly warm and above 28 °C / 82 °F as warm as a bath. Right now the sea at Upolu is 26.7 °C / 80 °F.

Can you swim at Upolu in August?

Yes – the sea at Upolu (South Pacific, Samoa) stays swimmable all year. August is the coolest month, averaging 27.8 °C / 82 °F – refreshing to pleasantly warm water, ideal for most people.

When is the sea warmest at Upolu?

In April, at 29.5 °C / 85 °F on average. The coolest month is August at 27.8 °C / 82 °F – still above the 18 °C / 64 °F swimming line, so there is no off-season for swimming.