30YearWeather
Honolulu in September
Honolulu weather in September - United States
☀️Hot & Sunny

Honolulu Weather in September

Plan your September trip to Honolulu, United States. Based on 30 years of NASA data, expect temperatures of 29°C (high) to 24°C (low), with 6% rain probability and 8 hours of daily sunshine. The Pacific Ocean averages 27°C in September. Great conditions with only 0 rainy days expected.

Avg High
29°C

Hottest around day 1

Avg Low
24°C

Coolest around day 12

Rainy Days
0days

6% avg rain chance

Sunshine
8hrs/day

Autumn season

Sea Temperature in September

Pacific Ocean(Ka Moana Pakipika)

26.9°C

Monthly Average

Water Feel
🌴Tropical

Perfect for swimming and water sports

Swim Rating
Excellent for swimming

Based on average sea surface temperature

Body of Water
Pacific Ocean

Ka Moana Pakipika

Honolulu coastline

Honolulu September Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

The area code for Honolulu, and the rest...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Honolulu

Smart Flight Estimator

Airport-to-Airport Logistics

unlock smart flight estimates

Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Well Connected
60/ 100
Traffic Index

Popular destination

Peak Daily Arrivals

0

slots per day

Peak

May

Low

Jul

Monthly Traffic Distribution

222
Jan
214
Feb
223
Mar
234
Apr
305
May
232
Jun
136
Jul
250
Aug
217
Sep
206
Oct
203
Nov
152
Dec
Traffic Level
Low Season

Key Connections

Los Angeles (LAX)
Kahului (OGG)
Kailua/Kona Kona At Keahole (KOA)
Hilo (ITO)
Lihue (LIH)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Honolulu?

👌Worthwhile timing with some trade-offs
Short Answer

Tropical storm season is active in Honolulu during September. Average conditions (29°C, 6% rain) can be interrupted by severe weather. Monitor forecasts closely.

Decision Factors

Eastern Pacific Hurricane season active

Eastern Pacific zone - expect potential eastern pacific hurricane activity

Warm tropical seas

26.9°C sea temperature - Tropical Bath

Excellent dry conditions

Only 6% rain probability - ideal for outdoor activities

Plenty of sunshine

11.1h of sunshine daily

Shoulder season - balanced conditions

71% of peak - good value with moderate crowds

Good For

  • 🏖️
    Beach lovers

    26.9°C warm seas and 6% rain probability

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 28.7°C temperatures and low 6% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 28.7°C, 6% rain chance

  • 📸
    Photographers

    11.1h sunshine, 59% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

Who Should Avoid

  • 💼
    Business travelers

    Storm season may cause flight disruptions

900 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Honolulu in September averages 29°C with 6% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Honolulu in September

What are the temperatures in Honolulu in September?

Daytime highs average 29°C, nights drop to 24°C. Temperatures remain fairly consistent.

How many rainy days in Honolulu in September?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Honolulu in September?

Light, breathable fabrics. Don't forget sunglasses and a hat.

Is September peak season in Honolulu?

This is shoulder season—moderate prices and manageable crowds.