September Weather in El Rosalito, Mexico

Last updated: August 27, 2025

In El Rosalito, Mexico, the average temperature in September hovers around 19°C (66°F). Expect a minimum of 8°C (47°F) and a comfortable maximum of 29°C (85°F). Be prepared for a bit of rain, as precipitation can reach 110 mm (4.3 in) over 17 days. With an average humidity of 81%, it's a month to embrace the refreshing moisture!

September Temperature in El Rosalito

In September in El Rosalito, the average temperature is 19°C (66°F). Maximums can reach 29°C (85°F), while minimums can dip as low as 8°C (47°F). This makes it a great time for travelers to enjoy moderate weather and diverse outdoor activities.

September Weather in El Rosalito: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in El Rosalito, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In El Rosalito, September typically has an average temperature of 19°C (66°F), with highs reaching up to 29°C (85°F) and lows dropping to around 8°C (47°F).

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

September Precipitation in El Rosalito

In El Rosalito in September, the precipitation amount is 110 mm (4.3 in) spread over 17 days.

September Precipitation Trends in El Rosalito

The chart displays monthly precipitation patterns in El Rosalito, 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 El Rosalito, September typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 17 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 El Rosalito

In El Rosalito in September, humidity is 81%. With an average temperature of 19°C (66°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel both muggy and slightly stifling, often leading to a need for frequent breaks in the shade.

September Average Humidity in El Rosalito

This chart illustrates the average monthly humidity levels in El Rosalito, 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 El Rosalito is approximately 81%, 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 El Rosalito

In El Rosalito in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in El Rosalito, you can check here.

Maximum UV Index Levels in El Rosalito for September

The chart shows the monthly maximum UV Index (UVI) for El Rosalito 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 El Rosalito typically reaches 14, which falls under the extreme exposure category.

Data source: El Rosalito 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 El Rosalito Compares to Other Months

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

This table compares monthly weather conditions in El Rosalito, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	5 mm (0.2 inches)	74%	very high
February Weather	15°C (60°F)	7 mm (0.3 inches)	65%	extreme
March Weather	18°C (64°F)	10 mm (0.4 inches)	58%	extreme
April Weather	20°C (69°F)	7 mm (0.3 inches)	58%	extreme
May Weather	22°C (71°F)	39 mm (1.5 inches)	67%	extreme
June Weather	20°C (69°F)	115 mm (4.5 inches)	76%	extreme
July Weather	19°C (67°F)	90 mm (3.5 inches)	67%	extreme
August Weather	20°C (68°F)	70 mm (2.8 inches)	68%	extreme
September Weather	19°C (66°F)	110 mm (4.3 inches)	81%	extreme
October Weather	17°C (63°F)	58 mm (2.3 inches)	83%	extreme
November Weather	15°C (59°F)	18 mm (0.7 inches)	84%	very high
December Weather	13°C (56°F)	5 mm (0.2 inches)	81%	very high