Kailua, Oahu weather in September 2025

Expect 86°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Kailua, Oahu in September. Check more long-term weather averages for Kailua, Oahu in September before you book your next holiday to Hawaii in 2025/2026.

  • 86°F maximum daytime temperature in September in Kailua, Oahu86
    86°F max day temperature
  • 9 hours of sunshine per day
  • 8 days with some rainfall in September in Kailua, Oahu8
    8 days with some rainfall
  • 72°F minimum night-time temperature in September in Kailua, Oahu72
    72°F min night temperature
  • 12 hours of daylight per day in September in Kailua, Oahu12
    12 hours of daylight per day
  • High heat & humidity in September in Kailua, OahuH
    High heat & humidity
  • 1.7 inches monthly rainfall in September in Kailua, Oahu1.7
    1.7 inches of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Kailua, Oahu11
    11 (Extreme) UV index
  • 81°F sea temperature in September in Kailua, Oahu81
    81°F sea temperature

More about Kailua, Oahu

Kailua, Oahu by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Hawaii

Luxury Escapes: Top handpicked holiday deals

  • Explore top handpicked deals on luxury holidays
  • Sign up for free to receive exclusive deals daily
  • Book holidays to destinations around the world
Go to Luxury Escapes deal >>

View all Luxury Escapes offers

The September weather guide for Hawaii (Kailua, Oahu) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

Back to top

More about the USA

How hot is it in Kailua, Oahu in September?

Daytime temperatures usually reach 86°F in Kailua, Oahu in September with high heat and humidity, falling to 72°F at night.

How sunny is it in Kailua, Oahu in September?

There are normally 9 hours of bright sunshine each day in Kailua, Oahu in September - that's 74% of daylight hours.

How warm is the sea around Kailua, Oahu in September?

The average sea temperature around Kailua, Oahu in September is 81°F.

Does it rain in Kailua, Oahu in September?

There are usually 8 days with some rain in Kailua, Oahu in September and the average monthly rainfall is 1.7 inches.

Kailua, Oahu September sunrise & sunset times

Browse the sunrise and sunset times for Kailua, Oahu in September 2025. Select a month to view Kailua, Oahu sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:15 18:47
Monday, 15th September 2025 06:18 18:33
Tuesday, 30th September 2025 06:22 18:19

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^