Kailua Weather in September

September is one of the perfect months to visit Kailua, with daytime temperatures of 28°C (82°F) and lows of 24°C (75°F) at night. Some rainfall is typical for this time of year.

Rainfall in Kailua in September

You can expect rain on around 8 days based on historical patterns, with 32 mm (1.3 in) average for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Kailua in September

September tends to be one of the perfect months in Kailua, with 28°C (82°F) in the afternoon and 24°C (75°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. At 24°C (75°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference. This month tends to be the warmest of the year. Light, comfortable clothing will serve you well.

Sunshine in Kailua in September

There are approximately 279 hours of sunshine this month, resulting in mostly clear days.

Wind Speed in Kailua 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

With water at 27°C (81°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Kailua's climate page.

Kailua Temperature in September

Min Temperature 24°C (75°F)  

Max Temperature 28°C (82°F)  

Water Temperature 27°C (81°F) *  

Chance of Rain 26%  

Precipitation 32 mm (1.3 in)  

Rainy days 8 days  

Humidity 66% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 279 hours *  

Percentage Sunshine 76% *  

* Data from: Honolulu, the United States of America (20 KM, 12 Miles).

What to Wear in Kailua in September

Warm but pleasant conditions in Kailua in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Light rain is possible, so consider bringing a small umbrella or rain jacket. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Kailua in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Kailua's climate page.

More climate data for Kailua

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Kailua climate overview or explore weather in the United States of America.