September Weather in Valparaiso, Mexico

Last updated: August 27, 2025

In September, the average temperature in Valparaiso, Mexico is a comfortable 17°C (63°F), with a minimum dipping to 9°C (48°F) and a maximum reaching 26°C (80°F). This month is also marked by significant precipitation, totaling 238 mm (9.4 in) over approximately 21 days. Expect a high average humidity of 86%, adding to the month’s lush atmosphere.

September Temperature in Valparaiso

In September in Valparaiso, the average temperature is 17°C (63°F). Maximums can reach 26°C (80°F) and minimums can be as low as 9°C (48°F). This mild climate makes Valparaiso an ideal destination for travelers seeking comfortable weather for exploring and enjoying outdoor activities.

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

The chart illustrates September temperature patterns in Valparaiso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valparaiso, September typically has an average temperature of 17°C (63°F), with highs reaching up to 26°C (80°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Valparaiso

In Valparaiso in September, the precipitation amount is 238 mm (9.4 in) over a period of 21 days.

September Precipitation Trends in Valparaiso

The chart displays monthly precipitation patterns in Valparaiso, 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 Valparaiso, September typically receives around 238 mm (9.4 inches) of precipitation spread over approximately 21 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 Valparaiso

In Valparaiso in September humidity is 86%. With an average temperature of 17°C (63°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and slightly stifling for traveling, as every step requires more effort and even a gentle breeze feels refreshing amidst the muggy atmosphere.

September Average Humidity in Valparaiso

This chart illustrates the average monthly humidity levels in Valparaiso, 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 Valparaiso is approximately 86%, 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 Valparaiso

In Valparaiso 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 Valparaiso, you can check here.

Maximum UV Index Levels in Valparaiso for September

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

Data source: Valparaiso 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 Valparaiso Compares to Other Months

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

This table compares monthly weather conditions in Valparaiso, 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 (52°F)	20 mm (0.8 inches)	71%	very high
February Weather	13°C (55°F)	19 mm (0.7 inches)	64%	extreme
March Weather	16°C (61°F)	9 mm (0.3 inches)	49%	extreme
April Weather	18°C (64°F)	3 mm (0.1 inches)	47%	extreme
May Weather	20°C (67°F)	24 mm (0.9 inches)	55%	extreme
June Weather	20°C (68°F)	126 mm (5.0 inches)	77%	extreme
July Weather	17°C (64°F)	293 mm (11.5 inches)	82%	extreme
August Weather	18°C (64°F)	172 mm (6.8 inches)	83%	extreme
September Weather	17°C (63°F)	238 mm (9.4 inches)	86%	extreme
October Weather	16°C (61°F)	82 mm (3.2 inches)	83%	extreme
November Weather	14°C (57°F)	21 mm (0.8 inches)	80%	very high
December Weather	11°C (53°F)	15 mm (0.6 inches)	83%	very high