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Warmest beach in Hawaii in September

111 coastal locations in Hawaii ranked by their typical September sea temperature. State-wide average in September: 27.2°C.

Warmest in September

Laysan Island, Hawaii

28.0°C

State September average

27.2°C

across 111 coastal locations in Hawaii

Vs annual mean

+1.4°C

above the year-round state average

What the Hawaii water feels like in September

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Hawaii monthly average 24.4°C to 27.2°C
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  • Warmest month September 27.2°C
  • Coldest month March 24.4°C
  • Annual mean 25.8°C
  • Months above 20°C 12 of 12

Where September fits in the year

September sits inside the state pattern shown on the left. Browse a different month for a fresh ranking.

Hawaii sea temperature map (live)

Today's reading at every Hawaii beach we track. The list below uses the typical September mean from a decade of daily history.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 warmest Hawaii beaches in September

Sorted by typical September mean. Click any beach for the full location page.

# Location September mean
1 Laysan Island, Hawaii Hawaii 28.0°C
2 French Frigate Shoals Hawaii 27.7°C
3 East Island, French Frigate Shoals, Hawaii Hawaii 27.6°C
4 Kealakekua Bay Hawaii 27.6°C
5 Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii Hawaii 27.6°C
6 Nonopapa, Niihau Island, Hawaii Hawaii 27.6°C
7 Eleele Hawaii 27.5°C
8 Hanapepe Hawaii 27.5°C
9 Kekaha Hawaii 27.5°C
10 Lihue Hawaii 27.5°C
11 Poipu Hawaii 27.5°C
12 Island of Hawaii Hawaii 27.4°C
13 Kahaluu-Keauhou Hawaii 27.4°C
14 Kailua Kona Hawaii 27.4°C
15 Port Allen, Hanapepe Bay, Kauai Island Hawaii 27.4°C
16 Waimea Bay, Kauai Island, Hawaii Hawaii 27.4°C
17 Hanamaulu Bay, Kauai Island, Hawaii Hawaii 27.4°C
18 Nawiliwili, Nawiliwili Harbor, Kauai Island Hawaii 27.4°C
19 Kaumalapau, Lanai Island, Hawaii Hawaii 27.4°C
20 Waianae, Oahu Island, Hawaii Hawaii 27.3°C
21 Hanalei Bay, Kauai Island, Hawaii Hawaii 27.3°C
22 Hapuna Beach Hawaii 27.3°C
23 Puako Hawaii 27.3°C
24 Waikoloa Village Hawaii 27.3°C
25 Kua Bay Hawaii 27.3°C
Show 25 more ▸
26 Kauai Hawaii 27.2°C
27 Kuheia Bay, Kahoolawe Island, Hawaii Hawaii 27.2°C
28 Smuggler Cove, Kahoolawe Island, Hawaii Hawaii 27.2°C
29 Kaunakakai Harbor, Molokai Island Hawaii 27.2°C
30 Kolo, Molokai Island, Hawaii Hawaii 27.2°C
31 Lanai Hawaii 27.2°C
32 Anahola Hawaii 27.2°C
33 Anini Beach Hawaii 27.2°C
34 Ewa Beach Hawaii 27.2°C
35 Hanalei Hawaii 27.2°C
36 Kapaa Hawaii 27.2°C
37 Ko Olina Hawaii 27.2°C
38 Maili Hawaii 27.2°C
39 Makaha Hawaii 27.2°C
40 Nanakuli Hawaii 27.2°C
41 Oahu Hawaii 27.2°C
42 Princeville Hawaii 27.2°C
43 Waianae Hawaii 27.2°C
44 Wailua Hawaii 27.2°C
45 Waipahu Hawaii 27.2°C
46 Fort Kamehameha, Bishop Point, Pearl Harbor, Oahu Island Hawaii 27.2°C
47 Honolulu, Honolulu Harbor, Oahu Island Hawaii 27.2°C
48 Moku o Loe, Kaneohe Bay, Oahu Island Hawaii 27.2°C
49 Pearl Harbor, Ford Island Ferry Dock, Oahu Island Hawaii 27.2°C
50 Haleiwa, Waialua Bay, Oahu Island, Hawaii Hawaii 27.1°C

Coldest 10 in Hawaii in September

Same data the other way.

# Location September mean
1 Hana, Maui Island, Hawaii Hawaii 26.8°C
2 Hana Hawaii 26.9°C
3 Hilo Bay Hawaii 26.9°C
4 Hilo, Hilo Bay, Kuhio Bay Island Hawaii 26.9°C
5 Hanauma Bay Hawaii 26.9°C
6 Kailua Hawaii 26.9°C
7 Lanikai Hawaii 26.9°C
8 Waimanalo Beach Hawaii 26.9°C
9 Hauula Hawaii 26.9°C
10 Kaaawa Hawaii 26.9°C

Other US states

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