September Weather in Waianae, United States

Last updated: June 24, 2025

In September, the average temperature in Waianae, United States hovers around 26°C (79°F), providing a pleasantly warm climate. You'll experience a minimum of 23°C (74°F) and a maximum of 29°C (84°F), perfect for enjoying outdoor activities. However, keep in mind that there is an average precipitation of 13 mm (0.5 in) spread over 3 days, contributing to an average humidity of 82%.

September Temperature in Waianae

In September in Waianae, the average temperature is 26°C (79°F). The maximum can reach 29°C (84°F), and the minimum can be as low as 23°C (74°F). This mild and pleasant weather makes Waianae an ideal destination for travelers seeking comfortable conditions.

September Weather in Waianae: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Waianae, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waianae, September typically has an average temperature of 26°C (79°F), with highs reaching up to 29°C (84°F) and lows dropping to around 23°C (74°F).

Data source: Temperature data for Waianae generated using information from the Copernicus Climate Change Service.

September Precipitation in Waianae

In Waianae in September, the precipitation amount is 13 mm (0.5 in) over a span of 3 days.

September Precipitation Trends in Waianae

The chart displays monthly precipitation patterns in Waianae, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Waianae, September typically receives around 13 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Waianae

In Waianae in September, humidity is 82%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket that envelops you, making outdoor activities feel more taxing and requiring frequent breaks to stay hydrated.

September Average Humidity in Waianae

This chart illustrates the average monthly humidity levels in Waianae, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Waianae is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Waianae

In Waianae in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Waianae.

Maximum UV Index Levels in Waianae for September

The chart shows the monthly maximum UV Index (UVI) for Waianae in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Waianae typically reaches 12, which falls under the extreme exposure category.

Data source: Waianae September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Waianae Compares to Other Months

Weather in Waianae varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Waianae, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Waianae, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (73°F)	14 mm (0.5 inches)	78%	very high
February Weather	22°C (72°F)	74 mm (2.9 inches)	79%	very high
March Weather	22°C (72°F)	65 mm (2.5 inches)	78%	extreme
April Weather	23°C (74°F)	26 mm (1.0 inches)	81%	extreme
May Weather	24°C (75°F)	20 mm (0.8 inches)	82%	extreme
June Weather	25°C (77°F)	36 mm (1.4 inches)	82%	extreme
July Weather	25°C (78°F)	7 mm (0.3 inches)	83%	extreme
August Weather	26°C (79°F)	11 mm (0.5 inches)	83%	extreme
September Weather	26°C (79°F)	13 mm (0.5 inches)	82%	extreme
October Weather	25°C (78°F)	44 mm (1.7 inches)	81%	extreme
November Weather	24°C (76°F)	21 mm (0.8 inches)	80%	very high
December Weather	23°C (74°F)	77 mm (3.0 inches)	79%	high