Waikiki sea temperature today: 27°C – beach water temperature, Waikiki, United States
Hawaii · Oahu
Waikiki
Sea
26.8°C80.2°F
Air
UV
Beach day
⁦23–28°C⁩

Last updated ·

Today, September 13, the sea temperature at Waikiki is 26.8 °C (80 °F). That matches the usual average of 26.9 °C in September. Comfortable for swimming year-round.

Beachfront hotels in this photo: Sheraton Waikiki and Moana Surfrider.

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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 October (26.9°C). Coldest in March (24.6°C). Comfortable for swimming year-round.

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
MonthSea · MinSea · AvgSea · MaxAir · MinAir · AvgAir · Max
January24.7°C25.1°C25.5°C22.9°C23.5°C23.9°C
February24.5°C24.7°C24.9°C22.6°C23.1°C23.5°C
March24.3°C24.6°C24.9°C22.6°C23.1°C23.5°C
April24.5°C24.8°C25.2°C22.9°C23.4°C23.7°C
May25.0°C25.2°C25.5°C23.5°C24.1°C24.4°C
June25.6°C25.9°C26.1°C24.2°C24.8°C25.1°C
July26.1°C26.3°C26.4°C24.8°C25.3°C25.6°C
August26.4°C26.7°C27.0°C25.0°C25.6°C26.0°C
September26.4°C26.9°C27.2°C25.1°C25.7°C26.1°C
October26.4°C26.9°C27.2°C24.9°C25.5°C25.8°C
November26.0°C26.2°C26.3°C24.3°C24.8°C25.1°C
December25.2°C25.5°C25.9°C23.6°C24.0°C24.3°C

About Waikiki

Waikīkī occupies the south shore of Oahu, anchored at its eastern end by Diamond Head, a 232-metre tuff cone known in Hawaiian as Lēʻahi and formed by a hydrovolcanic eruption around 300,000 years ago. Central Kuhio Beach sits sheltered by offshore breakwaters that pool calm water for swim schools and first-time surfers, while Queen's Surf Beach below the crater draws longboarders to its slow point break. Sea temperatures hold 26–27 °C79–81 °F from July through September, with Honolulu International about twenty minutes by H-1.

Frequently asked questions

Today, September 13, the sea at Waikiki is 26.8 °C (80 °F)80 °F (26.8 °C) – ideal for swimming for most people. The usual September average is 26.9 °C80 °F.

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C55 °F icy, 13–18 °C55–64 °F cold, 18–23 °C64–73 °F refreshing, 23–28 °C73–82 °F pleasantly warm and above 28 °C82 °F like a bath. Right now the sea at Waikiki is 26.8 °C80 °F.

Yes – the sea at Waikiki (Oahu, Hawaii) stays swimmable all year. March is the coolest month, averaging 24.6 °C76 °F – ideal for swimming for most people; the warmest is October at 26.9 °C80 °F.

In October, at 26.9 °C80 °F on average. The coolest month is March at 24.6 °C76 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.