nomadseason

July Weather in San Juan, United States

Last updated: June 24, 2025

The average temperature in San Juan, United States during July hovers around 30°C (87°F), making it quite a warm time of year. Expect a minimum of 22°C (71°F) and highs reaching a sizzling 42°C (108°F). Rainfall isn't frequent, with an average precipitation of just 100 mm (3.9 in) spread over 6 days. The average humidity sits at a comfortable 66%, adding to the tropical atmosphere.

July Temperature in San Juan

In July in San Juan, the average temperature is 30°C (87°F). The maximum can reach 42°C (108°F), while the minimum can be as low as 22°C (71°F). Be prepared for warm weather and pack accordingly if you're planning to visit during this time!

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 30°C (87°F), with highs reaching up to 42°C (108°F) and lows dropping to around 22°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec616572778285868884776964
Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in San Juan

In San Juan in July, the precipitation amount is 100 mm (3.9 in) spread over 6 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 100 mm (3.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2021313187811002296513021
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

July Humidity in San Juan

In San Juan in July, humidity is 66%. With an average temperature of 30°C (87°F), this humidity feels like a warm, sticky embrace that clings to your skin and makes traveling feel heavy and slow.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec6910111212121211976
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.
 TemperaturePrecipitationHumidityUV
January Weather16°C (62°F)20 mm (0.8 inches)83%high
February Weather18°C (65°F)21 mm (0.8 inches)79%very high
March Weather22°C (72°F)31 mm (1.2 inches)76%very high
April Weather25°C (78°F)31 mm (1.2 inches)77%extreme
May Weather28°C (83°F)87 mm (3.4 inches)80%extreme
June Weather30°C (86°F)81 mm (3.2 inches)73%extreme
July Weather30°C (87°F)100 mm (3.9 inches)66%extreme
August Weather31°C (88°F)22 mm (0.9 inches)65%extreme
September Weather29°C (84°F)96 mm (3.8 inches)73%extreme
October Weather25°C (77°F)51 mm (2.0 inches)76%very high
November Weather20°C (69°F)30 mm (1.2 inches)80%high
December Weather18°C (64°F)21 mm (0.8 inches)86%high

Compare San Juan's Climate with Cities Worldwide