United States Honolulu Weather in September — Climate Guide
September in Honolulu is very-high
Honolulu Weather in September — Quick Answer
As of 2026- Avg temp
- 30° / 24°
- Rainfall
- 25mm · 5 days
- Crowds
- Busy
As of 2026, Honolulu in September averages a high of 30°C and low of 24°C with 25mm of rain over about 5 days. Hot tropical + maximum UV. Hurricane-season rain jacket still in pack. Sea at warmest swimming temperature.
September is very-high for Honolulu.
September is Honolulu's value-shoulder month — Aloha Festivals (Hawaii's largest cultural celebration since 1946) brings free Royal Court Investiture ceremonies, free Hawaiian music concerts, and the iconic Floral Parade down Kalakaua Avenue (Waikiki's main thoroughfare).
Hotel pricing settles back to shoulder-season levels post-Labor Day (15-25% below summer peak). Korean Chuseok holiday (varies mid-September) adds a brief Korean-tourist spike, but the overall demand drop after Labor Day makes this the smart-value Korean autumn window.
Travel score
Honolulu September Weather Stats
Avg High
30°C
Avg Low
24°C
Rainy Days
5
25mm total
Sunshine
10h
Daily avg
Humidity
65%
moderate
UV Index
11
Extreme
Wind
14 km/h
Gusts 30
Sea Temp
27°C
swimming
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
6 μg/m³
PM10
15 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
32°C
Nighttime
25°C
Humidity and wind affect how the actual temperature feels.
Wind
14 km/h
Max gust 30 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Aloha Festivals (Hawaii's largest cultural event)
- Hotel pricing returns to shoulder-season levels
- Sea at warmest swimming temperature
Cons
- Hurricane peak season continues through September 30
- Days still hot at 30°C
- Korean Chuseok adds brief spike
September Events & Festivals
- Aloha Festivals (2nd-3rd week September, Hawaii's largest cultural celebration)
- Hurricane peak continues
- Korean Chuseok (varies, mid-September)
Honolulu in September — Full Picture
September is Honolulu's value-shoulder month — Aloha Festivals (Hawaii's largest cultural celebration since 1946) brings free Royal Court Investiture ceremonies, free Hawaiian music concerts, and the iconic Floral Parade down Kalakaua Avenue (Waikiki's main thoroughfare).
Hotel pricing settles back to shoulder-season levels post-Labor Day (15-25% below summer peak). Korean Chuseok holiday (varies mid-September) adds a brief Korean-tourist spike, but the overall demand drop after Labor Day makes this the smart-value Korean autumn window.
Hurricane peak continues through September 30 — Honolulu averages 1 hurricane near-miss per decade, but September is the peak risk month. Buy travel insurance with hurricane cancellation coverage.
Weather still hot (30°C / 86°F days, 27°C / 81°F sea) but more tolerable than the July-August peak. Outdoor activities at peak condition. Hanauma Bay snorkeling visibility excellent.
The smart September move: target the second or third week (during Aloha Festivals for the free cultural events). Pre-book Pearl Harbor 60 days ahead. Travel insurance with hurricane coverage is non-negotiable for this month.
What to Wear & What to Pack
Hot tropical + maximum UV. Hurricane-season rain jacket still in pack. Sea at warmest swimming temperature.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
27.7°C
21°C
6/mo
Summer (Jun·Jul·Aug)
30°C
23.7°C
3.7/mo
Autumn (Sep·Oct·Nov)
Current29.7°C
23°C
7/mo
Winter (Dec·Jan·Feb)
27°C
20.3°C
10.3/mo
Honolulu Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 27° | 20° | 11d·100mm | 7h | 70% | 8 | Very busy | Peak | |
| February (Best) | 27° | 20° | 9d·80mm | 8h | 68% | 9 | Very busy | Peak |
| March (Best) | 27° | 20° | 7d·60mm | 8h | 67% | 9 | Busy | Shoulder |
| April (Best) | 28° | 21° | 6d·30mm | 9h | 65% | 10 | Busy | Shoulder |
| May (Best) | 28° | 22° | 5d·30mm | 10h | 65% | 11 | Very busy | Peak |
| June (Best) | 29° | 23° | 4d·15mm | 11h | 63% | 11 | Very busy | Peak |
| July (Best) | 30° | 24° | 3d·10mm | 11h | 65% | 12 | Very busy | Peak |
| August (Best) | 31° | 24° | 4d·15mm | 11h | 65% | 12 | Very busy | Peak |
| September (Best) | 30° | 24° | 5d·25mm | 10h | 65% | 11 | Busy | Shoulder |
| October (Best) | 30° | 23° | 7d·50mm | 9h | 67% | 9 | Moderate | Shoulder |
| November (Best) | 29° | 22° | 9d·80mm | 8h | 70% | 8 | Moderate | Shoulder |
| 27° | 21° | 11d·100mm | 7h | 70% | 7 | Very busy | Peak |
View Other Months
Honolulu September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Honolulu?
Honolulu in September is very-high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Honolulu in September?
Honolulu September averages a high of 30°C and a low of 24°C.
Does it rain much in Honolulu in September?
Honolulu September averages 25mm of rainfall over about 5 rainy days.
What should I wear in Honolulu in September?
Hot tropical + maximum UV. Hurricane-season rain jacket still in pack. Sea at warmest swimming temperature.
What time are sunrise and sunset in Honolulu in September?
Honolulu September sunrise is 06:15 and sunset is 18:25, with 12h 10m of daylight.
What's the air quality like in Honolulu in September?
Honolulu September air quality (AQI) averages 25, rated Good. PM2.5 averages 6μg/m³.
What activities are recommended in Honolulu in September?
In September, Honolulu is great for Aloha Festivals (free events), Waikiki + Diamond Head, Pearl Harbor.
Is September peak season in Honolulu?
Honolulu September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Honolulu
View Other Months
Planning a September trip to Honolulu?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.