September Weather in Pasadena Hills, United States

Last updated: June 24, 2025

In September, the average temperature in Pasadena Hills, United States hovers around a warm 27°C (81°F). Expect a pleasant range, with minimums dropping to 18°C (66°F) and highs reaching up to 35°C (95°F). Be prepared for some rain, as precipitation averages 189 mm (7.4 in) over 20 days, along with a notable average humidity of 83%. Enjoy the tropical vibes!

September Temperature in Pasadena Hills

In September in Pasadena Hills, the average temperature is 27°C (81°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 18°C (66°F). It's an ideal time to visit, as you can enjoy warm weather while still having pleasant evenings.

September Weather in Pasadena Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Pasadena Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pasadena Hills, September typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (95°F) and lows dropping to around 18°C (66°F).

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

September Precipitation in Pasadena Hills

In Pasadena Hills in September, the precipitation amount is 189 mm (7.4 in) over the course of 20 days.

September Precipitation Trends in Pasadena Hills

The chart displays monthly precipitation patterns in Pasadena Hills, 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 Pasadena Hills, September typically receives around 189 mm (7.4 inches) of precipitation spread over approximately 20 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 Pasadena Hills

In Pasadena Hills in September humidity is 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

September Average Humidity in Pasadena Hills

This chart illustrates the average monthly humidity levels in Pasadena Hills, 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 Pasadena Hills is approximately 83%, 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 Pasadena Hills

In Pasadena Hills in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Pasadena Hills.

Maximum UV Index Levels in Pasadena Hills for September

The chart shows the monthly maximum UV Index (UVI) for Pasadena Hills 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 Pasadena Hills typically reaches 11, which falls under the extreme exposure category.

Data source: Pasadena Hills 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 Pasadena Hills Compares to Other Months

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

This table compares monthly weather conditions in Pasadena Hills, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (60°F)	43 mm (1.7 inches)	83%	high
February Weather	19°C (66°F)	69 mm (2.7 inches)	80%	very high
March Weather	20°C (68°F)	20 mm (0.8 inches)	75%	very high
April Weather	23°C (73°F)	77 mm (3.0 inches)	70%	extreme
May Weather	25°C (78°F)	123 mm (4.8 inches)	68%	extreme
June Weather	27°C (81°F)	223 mm (8.8 inches)	75%	extreme
July Weather	27°C (81°F)	276 mm (10.8 inches)	79%	extreme
August Weather	28°C (82°F)	247 mm (9.7 inches)	81%	extreme
September Weather	27°C (81°F)	189 mm (7.4 inches)	83%	extreme
October Weather	25°C (77°F)	82 mm (3.2 inches)	81%	very high
November Weather	20°C (68°F)	49 mm (1.9 inches)	82%	high
December Weather	17°C (64°F)	70 mm (2.8 inches)	84%	moderate