Honolulu Weather in September
In Honolulu, September brings high daytime temperatures around 29°C (84°F), with nights cooling to 24°C (75°F). Some rainfall is to be expected.
Rainfall in Honolulu in September
Typically, you can expect about 9 days of rain this month, with 24 mm (0.9 in) on average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Honolulu in September
September is a good time to be in Honolulu. Days are perfect, reaching 29°C (84°F), with nights around 24°C (75°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights stay warm at around 24°C (75°F), so light bedding and good ventilation are worth thinking about. It's the warmest month of the year on average, so summer clothing is the way to go.
Sunshine in Honolulu in September
With approximately 279 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.
Wind Speed in Honolulu in September
Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.
Average water temperature in September
The water temperature is 27°C (81°F), which most people find very comfortable. A good month for swimming and water sports.If you're interested in exploring other destinations, our weather planner can help you discover additional travel options worldwide.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Honolulu's climate page.
Honolulu Temperature in September
Min Temperature
24°C (75°F)
Max Temperature
29°C (84°F)
Water Temperature
27°C (81°F)
Chance of Rain
29%
Precipitation
24 mm (0.9 in)
Rainy days
9 days
Humidity
66%
Windspeed
4 m/s (8 knots)
Sunshine
279 hours
Percentage Sunshine
76%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Honolulu typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Honolulu in September
Browse day-by-day weather records for Honolulu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Honolulu historical weather extremes in September
Based on weather observations in Honolulu between 1976 and 2025, these are the recorded extremes during September.
- On September 4, 1986, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- On September 21, 2019, Honolulu saw its coldest September day with temperatures maxing out at 26°C (79°F).
- The lowest overnight temperature recorded in September was 19°C (66°F) (September 28, 1996).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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tolerable
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What to Wear in Honolulu in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Some rain is possible, so pack something to handle light showers. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Honolulu in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Honolulu's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Honolulu climate overview or explore weather in the United States of America.
