Swimming in Hawaii in september 2025 Sea temperature by city in september

Do you want to go to the beach in Hawaii in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Hawaii by city and our opinion on the chances of enjoying pleasant sea conditions.

Sea temperature in Hawaii in september 2025

Here, find the average sea temperature in Hawaii in september in several coastal cities.

Direct access: O'ahu in september | Kauaʻi in september | Maui in september | Big Island in september

O'ahu in september

Honolulu (Oahu)

on average:

81°F

min: 79°F / max: 83°F

La'ie

on average:

81°F

min: 79°F / max: 82°F

Waianae

on average:

81°F

min: 80°F / max: 83°F

'Aiea

on average:

81°F

min: 79°F / max: 83°F

'Ewa Beach

on average:

81°F

min: 80°F / max: 83°F

Hale'iwa

on average:

81°F

min: 79°F / max: 82°F

Kauaʻi in september

Kauai (Garden Isle)

on average:

81°F

min: 79°F / max: 82°F

Kekaha

on average:

81°F

min: 79°F / max: 82°F

Kilauea

on average:

80°F

min: 79°F / max: 82°F

Niihau

on average:

81°F

min: 80°F / max: 82°F

Lihue

on average:

80°F

min: 79°F / max: 82°F

Anahola

on average:

81°F

min: 79°F / max: 82°F

Maui in september

Maui

on average:

81°F

min: 79°F / max: 83°F

Hana

on average:

80°F

min: 79°F / max: 82°F

Kahului

on average:

80°F

min: 79°F / max: 82°F

Molokai

on average:

81°F

min: 79°F / max: 83°F

Kahoolawe

on average:

81°F

min: 79°F / max: 83°F

Lanai

on average:

81°F

min: 79°F / max: 82°F

Big Island in september

Hilo

on average:

79°F

min: 78°F / max: 81°F

Captain Cook

on average:

80°F

min: 79°F / max: 82°F

Pahala

on average:

80°F

min: 79°F / max: 82°F

island of Hawaii (Big Island)

on average:

81°F

min: 79°F / max: 82°F

Hawaiian Ocean View

on average:

80°F

min: 79°F / max: 82°F

Hawi

on average:

80°F

min: 79°F / max: 82°F

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Sea temperature in august in Hawaii

Sea temperature in october in Hawaii

Where should you go swimming in Hawaii in the month of september?

Swimming in Hawaii in september is ideal

In september in Hawaii swimming conditions are generally the same everywhere.

In september in Honolulu (Oahu), Kauai (Garden Isle), Maui, Hilo, Captain Cook, Hana, Kahului, Kekaha, Kilauea, La'ie, Molokai, Niihau, Pahala, Waianae, island of Hawaii (Big Island), Kahoolawe, Lanai, Lihue, 'Aiea, 'Ewa Beach, Anahola, Hale'iwa, Hau'ula, Hawaiian Ocean View, Hawi, Holualoa, Honoka'a, Kailua, Kalaheo, Kaneohe, Kapaau, Kaunakakai, Kihei, Koloa, Paia, Papa'ikou, Pearl City, Waialua, Waikoloa, Wailuku, Waimanalo, Waimea and Waipahu, swimming conditions are perfect! With water reaching a maximum of 83°F and an average of 81°F, going in the water (and staying there!) feels great.

Where to go swimming in Hawaii in september: the map of sea temperatures

ideal swimming

pleasant swimming

cool swimming

cold swimming

freezing swimming

Water temperature and seasonal norms in september

Honolulu (Oahu)

	August	September	October
Average sea temperature	80°F	81°F	81°F
Minimum sea temperature	79°F	79°F	79°F
Maximum sea temperature	81°F	83°F	82°F
Average outside temperature	81°F	81°F	81°F
Maximum outside temperature	83°F	83°F	83°F
Minimum outside temperature	79°F	79°F	77°F
Precipitation	2.5in	2.6in	3.2in
Number of days of precipitation	3 jour(s) (9%)	3 jour(s) (11%)	5 jour(s) (15%)
Cloud cover	35%	33%	34%
Our opinion	ideal swimming	ideal swimming	ideal swimming

More information on swimming in Honolulu (Oahu) in september

Kauai (Garden Isle)

	August	September	October
Average sea temperature	79°F	81°F	80°F
Minimum sea temperature	78°F	79°F	79°F
Maximum sea temperature	81°F	82°F	82°F
Average outside temperature	81°F	81°F	79°F
Maximum outside temperature	83°F	83°F	81°F
Minimum outside temperature	79°F	79°F	79°F
Precipitation	4in	3.3in	3.9in
Number of days of precipitation	5 jour(s) (17%)	4 jour(s) (15%)	6 jour(s) (18%)
Cloud cover	43%	38%	39%
Our opinion	ideal swimming	ideal swimming	ideal swimming

More information on swimming in Kauai (Garden Isle) in september

Maui

	August	September	October
Average sea temperature	80°F	81°F	80°F
Minimum sea temperature	79°F	79°F	79°F
Maximum sea temperature	82°F	83°F	81°F
Average outside temperature	79°F	81°F	79°F
Maximum outside temperature	81°F	81°F	81°F
Minimum outside temperature	79°F	79°F	79°F
Precipitation	1.1in	0.9in	1.1in
Number of days of precipitation	1 jour(s) (4%)	1 jour(s) (3%)	1 jour(s) (4%)
Cloud cover	28%	24%	26%
Our opinion	ideal swimming	ideal swimming	ideal swimming

More information on swimming in Maui in september

Hilo

	August	September	October
Average sea temperature	80°F	79°F	80°F
Minimum sea temperature	78°F	78°F	79°F
Maximum sea temperature	81°F	81°F	81°F
Average outside temperature	74°F	76°F	76°F
Maximum outside temperature	76°F	77°F	77°F
Minimum outside temperature	72°F	74°F	74°F
Precipitation	5.8in	3.9in	5.4in
Number of days of precipitation	6 jour(s) (20%)	5 jour(s) (18%)	7 jour(s) (24%)
Cloud cover	33%	31%	31%
Our opinion	ideal swimming	ideal swimming	ideal swimming

More information on swimming in Hilo in september

Captain Cook

	August	September	October
Average sea temperature	80°F	80°F	80°F
Minimum sea temperature	79°F	79°F	79°F
Maximum sea temperature	82°F	82°F	81°F
Average outside temperature	74°F	74°F	74°F
Maximum outside temperature	76°F	76°F	76°F
Minimum outside temperature	72°F	70°F	70°F
Precipitation	4.4in	3.8in	4in
Number of days of precipitation	5 jour(s) (18%)	6 jour(s) (22%)	6 jour(s) (20%)
Cloud cover	28%	29%	22%
Our opinion	ideal swimming	ideal swimming	ideal swimming

More information on swimming in Captain Cook in september

List of coastal cities in Hawaii

Honolulu (Oahu) in september	ideal swimming
Kauai (Garden Isle) in september	ideal swimming
Maui in september	ideal swimming
Hilo in september	ideal swimming
Captain Cook in september	ideal swimming
Hana in september	ideal swimming
Kahului in september	ideal swimming
Kekaha in september	ideal swimming
Kilauea in september	ideal swimming
La'ie in september	ideal swimming
Molokai in september	ideal swimming
Niihau in september	ideal swimming
Pahala in september	ideal swimming
Waianae in september	ideal swimming
island of Hawaii (Big Island) in september	ideal swimming
Kahoolawe in september	ideal swimming
Lanai in september	ideal swimming
Lihue in september	ideal swimming
'Aiea in september	ideal swimming
'Ewa Beach in september	ideal swimming
Anahola in september	ideal swimming
Hale'iwa in september	ideal swimming
Hau'ula in september	ideal swimming
Hawaiian Ocean View in september	ideal swimming
Hawi in september	ideal swimming
Holualoa in september	ideal swimming
Honoka'a in september	ideal swimming
Kailua in september	ideal swimming
Kalaheo in september	ideal swimming
Kaneohe in september	ideal swimming
Kapaau in september	ideal swimming
Kaunakakai in september	ideal swimming
Kihei in september	ideal swimming
Koloa in september	ideal swimming
Paia in september	ideal swimming
Papa'ikou in september	ideal swimming
Pearl City in september	ideal swimming
Waialua in september	ideal swimming
Waikoloa in september	ideal swimming
Wailuku in september	ideal swimming
Waimanalo in september	ideal swimming
Waimea in september	ideal swimming
Waipahu in september	ideal swimming