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May Weather in San Diego, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Diego, Mexico hovers around 19°C (67°F). Expect a minimum of 11°C (52°F) and a peak of 30°C (86°F). During this period, the region experiences approximately 190 mm (7.5 in) of precipitation over 24 days, contributing to an average humidity of 82%.

May Temperature in San Diego

In May in San Diego, the average temperature is 19°C (67°F). Maximums can reach 30°C (86°F), and minimums can drop as low as 11°C (52°F). This mild climate makes San Diego an ideal destination for travelers seeking a pleasant getaway.

May Weather in San Diego: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, May typically has an average temperature of 19°C (67°F), with highs reaching up to 30°C (86°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec555861646666656565635956
Data source: Temperature data for San Diego 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.

May Precipitation in San Diego

In San Diego in May, the precipitation amount is 190 mm (7.5 in) over the course of 24 days.

May Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Diego, May typically receives around 190 mm (7.5 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec88649413319026221029133921711151
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Diego

In San Diego in May humidity is 82%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket wrapping around you, making each step feel sluggish and the air thick as you explore the sights.

May Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Diego is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%86%84%81%82%81%81%82%86%90%91%91%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Diego

In San Diego in May, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Diego.

Maximum UV Index Levels in San Diego for May

The chart shows the monthly maximum UV Index (UVI) for San Diego in May, 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 May, the maximum UV index in San Diego typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9121314151415141412108
Data source: San Diego May 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 May Weather in San Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (55°F)88 mm (3.5 inches)88%very high
February Weather15°C (58°F)64 mm (2.5 inches)86%extreme
March Weather16°C (61°F)93 mm (3.7 inches)84%extreme
April Weather18°C (65°F)133 mm (5.2 inches)81%extreme
May Weather19°C (67°F)190 mm (7.5 inches)82%extreme
June Weather19°C (66°F)262 mm (10.3 inches)81%extreme
July Weather18°C (65°F)210 mm (8.3 inches)81%extreme
August Weather18°C (65°F)291 mm (11.4 inches)82%extreme
September Weather18°C (65°F)339 mm (13.3 inches)86%extreme
October Weather17°C (63°F)217 mm (8.5 inches)90%extreme
November Weather15°C (59°F)111 mm (4.4 inches)91%very high
December Weather13°C (57°F)51 mm (2.0 inches)91%very high

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