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July Weather in San Ysidro, United States

Last updated: June 24, 2025

In July, the average temperature in San Ysidro, United States hovers around 29°C (84°F), making it a warm destination. Expect a minimum of 18°C (64°F) and potential highs reaching 41°C (107°F). Be prepared for some moisture, as the area receives approximately 31 mm (1.2 in) of precipitation over 7 days, alongside an average humidity level of 55%.

July Temperature in San Ysidro

In July in San Ysidro, the average temperature is 29°C (84°F). Maximums can reach 41°C (107°F), and minimums can be as low as 18°C (64°F). Travelers should be prepared for hot days and mild evenings.

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

The chart illustrates July temperature patterns in San Ysidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Ysidro, July typically has an average temperature of 29°C (84°F), with highs reaching up to 41°C (107°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec455058677583838277665546
Data source: Temperature data for San Ysidro generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in San Ysidro

In San Ysidro in July, the precipitation amount is 31 mm (1.2 in) over the course of 7 days.

July Precipitation Trends in San Ysidro

The chart displays monthly precipitation patterns in San Ysidro, 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 Ysidro, July typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1315163422313324211313
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in San Ysidro

In San Ysidro in July humidity is 55%. With an average temperature of 29°C (84°F), this humidity feels like a warm, enveloping blanket, making outdoor activities slightly sweaty but still enjoyable for travelers who take breaks in the shade and stay hydrated.

July Average Humidity in San Ysidro

This chart illustrates the average monthly humidity levels in San Ysidro, 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 Ysidro is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%65%55%54%53%55%58%70%75%83%82%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in San Ysidro

In San Ysidro 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 Ysidro.

Maximum UV Index Levels in San Ysidro for July

The chart shows the monthly maximum UV Index (UVI) for San Ysidro 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 Ysidro typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121213121211865
Data source: San Ysidro 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 Ysidro Compares to Other Months

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

This table compares monthly weather conditions in San Ysidro, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)13 mm (0.5 inches)79%moderate
February Weather10°C (50°F)14 mm (0.6 inches)79%high
March Weather14°C (58°F)16 mm (0.6 inches)65%very high
April Weather20°C (67°F)3 mm (0.1 inches)55%extreme
May Weather24°C (75°F)4 mm (0.2 inches)54%extreme
June Weather28°C (84°F)22 mm (0.9 inches)53%extreme
July Weather29°C (84°F)31 mm (1.2 inches)55%extreme
August Weather28°C (83°F)33 mm (1.3 inches)57%extreme
September Weather25°C (77°F)24 mm (0.9 inches)70%extreme
October Weather19°C (66°F)21 mm (0.8 inches)75%very high
November Weather13°C (56°F)13 mm (0.5 inches)83%high
December Weather8°C (47°F)12 mm (0.5 inches)82%moderate

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