July Weather in San Juan, Mexico

Last updated: August 27, 2025

In July, the average temperature in San Juan, Mexico is a warm 31°C (87°F), with a range that can dip to a comfortable 22°C (72°F) and soar to a scorching 42°C (107°F). Expect about 78 mm (3.1 in) of precipitation spread over 7 days, while the average humidity hangs around 68%. Stay cool and prepared for the weather!

July Temperature in San Juan

In July in San Juan, the average temperature is 31°C (87°F). Maximums can reach 42°C (107°F), and minimums can be as low as 22°C (72°F). Be prepared for hot weather and stay hydrated while exploring the vibrant sights of San Juan.

July Weather in San Juan: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, July typically has an average temperature of 31°C (87°F), with highs reaching up to 42°C (107°F) and lows dropping to around 22°C (72°F).

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

July Precipitation in San Juan

In San Juan in July, the total precipitation amount is 78 mm (3.1 in) over a duration of 7 days.

July Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In San Juan, July typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 7 days.

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

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Millimeters (mm) Inches (in)

July Humidity in San Juan

In San Juan in July humidity is 68%. With an average temperature of 31°C (87°F), this humidity feels like a warm blanket wrapping around you, making it essential to stay hydrated and take frequent breaks while exploring the sights.

July Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in San Juan is approximately 68%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in San Juan

In San Juan in July, 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 San Juan.

Maximum UV Index Levels in San Juan for July

The chart shows the monthly maximum UV Index (UVI) for San Juan in July, 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 July, the maximum UV index in San Juan typically reaches 12, which falls under the extreme exposure category.

Data source: San Juan July 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 July Weather in San Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (61°F)	20 mm (0.8 inches)	84%	high
February Weather	18°C (65°F)	13 mm (0.5 inches)	83%	very high
March Weather	23°C (73°F)	25 mm (1.0 inches)	78%	very high
April Weather	25°C (78°F)	46 mm (1.8 inches)	81%	extreme
May Weather	28°C (83°F)	86 mm (3.4 inches)	82%	extreme
June Weather	30°C (86°F)	86 mm (3.4 inches)	74%	extreme
July Weather	31°C (87°F)	78 mm (3.1 inches)	68%	extreme
August Weather	31°C (89°F)	16 mm (0.6 inches)	67%	extreme
September Weather	28°C (83°F)	119 mm (4.7 inches)	75%	extreme
October Weather	24°C (76°F)	56 mm (2.2 inches)	78%	very high
November Weather	20°C (68°F)	23 mm (0.9 inches)	83%	high
December Weather	17°C (64°F)	20 mm (0.8 inches)	86%	high