September Weather in Marin, Mexico

Last updated: August 27, 2025

In September, the average temperature in Marin, Mexico reaches a warm 28°C (83°F). Expect a range with a minimum of 23°C (73°F) and a maximum of 38°C (100°F). Be prepared for ample rainfall, with 214 mm (8.4 in) falling over 24 days, combined with an average humidity of 87%.

September Temperature in Marin

In September in Marin, the average temperature is 28°C (83°F). Maximum temperatures can reach 38°C (100°F), while the minimum can drop to as low as 23°C (73°F). This warm climate makes Marin an excellent destination for travelers seeking sun and outdoor activities.

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

The chart illustrates September temperature patterns in Marin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marin, September typically has an average temperature of 28°C (83°F), with highs reaching up to 38°C (100°F) and lows dropping to around 23°C (73°F).

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

September Precipitation in Marin

In Marin in September, the precipitation amount is 214 mm (8.4 in) spread over 24 days.

September Precipitation Trends in Marin

The chart displays monthly precipitation patterns in Marin, 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 Marin, September typically receives around 214 mm (8.4 inches) of precipitation spread over approximately 24 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 Marin

In Marin in September humidity is 87%. With an average temperature of 28°C (83°F), this humidity feels like you're enveloped in a warm, sticky blanket, making outdoor activities slightly uncomfortable and travel plans require frequent breaks for hydration and respite from the heat.

September Average Humidity in Marin

This chart illustrates the average monthly humidity levels in Marin, 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 Marin is approximately 87%, 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 Marin

In Marin 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 Marin.

Maximum UV Index Levels in Marin for September

The chart shows the monthly maximum UV Index (UVI) for Marin 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 Marin typically reaches 12, which falls under the extreme exposure category.

Data source: Marin 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 Marin Compares to Other Months

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

This table compares monthly weather conditions in Marin, 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 (74°F)	80 mm (3.2 inches)	83%	very high
February Weather	25°C (77°F)	30 mm (1.2 inches)	76%	very high
March Weather	26°C (80°F)	34 mm (1.4 inches)	66%	extreme
April Weather	29°C (84°F)	47 mm (1.9 inches)	59%	extreme
May Weather	30°C (86°F)	76 mm (3.0 inches)	64%	extreme
June Weather	29°C (84°F)	253 mm (10.0 inches)	69%	extreme
July Weather	29°C (85°F)	85 mm (3.3 inches)	82%	extreme
August Weather	29°C (84°F)	140 mm (5.5 inches)	87%	extreme
September Weather	28°C (83°F)	214 mm (8.4 inches)	87%	extreme
October Weather	27°C (81°F)	257 mm (10.1 inches)	88%	extreme
November Weather	25°C (77°F)	169 mm (6.6 inches)	88%	very high
December Weather	24°C (75°F)	71 mm (2.8 inches)	88%	very high