September Weather in Aptos, United States

Last updated: June 24, 2025

In September, the average temperature in Aptos, United States is a mild 16°C (62°F), with minimums dipping to 11°C (53°F) and highs reaching up to 31°C (88°F). Expect light precipitation, with only 2 mm (0.1 in) falling over 0 days, and enjoy a comfortable average humidity of 55%.

September Temperature in Aptos

In September in Aptos, the average temperature is 16°C (62°F). Maximums can reach 31°C (88°F), while minimums can drop to as low as 11°C (53°F). This makes it an ideal time for travelers to enjoy mild weather and explore the outdoors.

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

The chart illustrates September temperature patterns in Aptos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Aptos, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Aptos

In Aptos in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Aptos

The chart displays monthly precipitation patterns in Aptos, 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 Aptos, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Aptos

In Aptos in September humidity is 55%. With average temperature 16°C (62°F), this humidity feels like a comfortable embrace, making it ideal for traveling as the air is refreshingly crisp but not overly dry, allowing for pleasant exploration without the discomfort of extreme heat or stickiness.

September Average Humidity in Aptos

This chart illustrates the average monthly humidity levels in Aptos, 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 Aptos is approximately 55%, 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 Aptos

In Aptos in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Aptos.

Maximum UV Index Levels in Aptos for September

The chart shows the monthly maximum UV Index (UVI) for Aptos 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 Aptos typically reaches 9, which falls under the very high exposure category.

Data source: Aptos 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 Aptos Compares to Other Months

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

This table compares monthly weather conditions in Aptos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (53°F)	148 mm (5.8 inches)	82%	moderate
February Weather	11°C (53°F)	136 mm (5.3 inches)	84%	moderate
March Weather	11°C (53°F)	110 mm (4.3 inches)	82%	very high
April Weather	12°C (54°F)	42 mm (1.6 inches)	78%	very high
May Weather	13°C (55°F)	23 mm (0.9 inches)	71%	extreme
June Weather	14°C (58°F)	4 mm (0.2 inches)	64%	extreme
July Weather	15°C (59°F)	2 mm (0.1 inches)	58%	extreme
August Weather	16°C (61°F)	2 mm (0.1 inches)	54%	very high
September Weather	16°C (62°F)	2 mm (0.1 inches)	55%	very high
October Weather	16°C (60°F)	31 mm (1.2 inches)	62%	high
November Weather	14°C (57°F)	61 mm (2.4 inches)	78%	moderate
December Weather	12°C (53°F)	126 mm (4.9 inches)	80%	moderate