Kahului Weather in September
With daytime temperatures of 29°C (84°F) and nighttime lows of 23°C (73°F), September in Kahului brings high temperatures during the day. The excellent weather makes it an appealing time to visit.
Rainfall in Kahului in September
Past climate data indicates that roughly 7 days will see rain, totalling around 37 mm (1.5 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Kahului in September
September in Kahului is generally excellent, with days reaching 29°C (84°F) and nights settling around 23°C (73°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 23°C (73°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably. On average, it is the warmest month of the year.
Sunshine in Kahului in September
Enjoy a sunny month with about 271 hours of sunshine, the clear skies make Kahului even more beautiful.
Wind Speed in Kahului in September
September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
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.For more travel ideas, our weather planner can help you explore destinations around the world.
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 Kahului's climate page.
Kahului Temperature in September
Min Temperature
23°C (73°F)
Max Temperature
29°C (84°F)
Water Temperature
27°C (81°F)
Chance of Rain
23%
Precipitation
37 mm (1.5 in)
Rainy days
7 days
Humidity
70%
Windspeed
5 m/s (10 knots)
Sunshine
271 hours
Percentage Sunshine
74%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Kahului typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 22°C (72°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 Kahului in September
Browse day-by-day weather records for Kahului spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kahului historical weather extremes in September
Based on 49 years of weather observations in Kahului between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 19, 1995, with a maximum of 35°C (95°F).
- On September 24, 2025, Kahului saw its coldest September day with temperatures maxing out at 25°C (77°F).
- Kahului registered its coldest September night on September 15, 2009, with temperatures dropping to 16°C (61°F).
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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What to Wear in Kahului 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. The water temperature sits at about 27°C (81°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Kahului 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 Kahului's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Kahului climate overview or explore weather in the United States of America.
