Where is the sea coldest in Hawaii in September?

Waikiki Beach in United States has the coldest sea in Hawaii in September, averaging about 27.0 °C. Waimanalo Beach (27.0 °C) and Sunset Beach are the next coolest.

How many beaches in Hawaii are warm enough to swim in September?

25 of the top 25 ranked beaches in Hawaii average 22 °C or more in September, which most swimmers find comfortable without a wetsuit.

How are these September sea temperatures calculated?

Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.

Seasonal ranking

Coldest sea temperature in Hawaii in September

Where the sea is coolest across Hawaii during September, ranked by long-term monthly average water temperature. Waikiki Beach (Hawaii, United States) is the coolest at around 27°C. Open any spot for today's live water temperature and a 7-day swim forecast.

1
Waikiki Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
2
Waimanalo Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
3
Sunset Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
4
Ko Olina Lagoons
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
5
Kee Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
6
Kua Bay
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
7
Big Beach
Maui · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
8
Hamoa Beach
Maui · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
9
Hapuna Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
10
Makalawena Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
11
Poipu Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
12
Lydgate Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
13
Papohaku Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
14
Lanikai Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
15
Bellows Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
16
Wailea Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
17
Kaanapali Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
18
Kapalua Bay
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
19
Hookipa Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
20
Turtle Bay
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
21
Mokuleia Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
22
Polihua Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
23
Halawa Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
24
Little Beach Maui
Maui · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average
25
Salt Pond Beach
Hawaii · United States · Pacific Ocean
Warm — comfortable swimming
27°C
September average

Coldest sea in September elsewhere

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Hawaii in September — frequently asked questions

Where is the sea coldest in Hawaii in September?: Waikiki Beach in United States has the coldest sea in Hawaii in September, averaging about 27.0 °C. Waimanalo Beach (27.0 °C) and Sunset Beach are the next coolest.
How many beaches in Hawaii are warm enough to swim in September?: 25 of the top 25 ranked beaches in Hawaii average 22 °C or more in September, which most swimmers find comfortable without a wetsuit.
How are these September sea temperatures calculated?: Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.

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