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May Weather in El Cajon, United States

Last updated: June 24, 2025

In El Cajon, United States, the average temperature in May is a pleasant 17°C (63°F). You can expect a minimum of 9°C (49°F) and a maximum soaring up to 30°C (87°F). With an average humidity of 46%, conditions are generally comfortable. However, be prepared for 21 mm (0.8 in) of precipitation spread over 4 days. Stay prepared and enjoy your time!

May Temperature in El Cajon

In May in El Cajon, the average temperature is 17°C (63°F). Maximum temperatures can reach up to 30°C (87°F), while minimums can dip as low as 9°C (49°F). This pleasant climate makes El Cajon an ideal destination for travelers seeking mild weather during this time.

May Weather in El Cajon: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in El Cajon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In El Cajon, May typically has an average temperature of 17°C (63°F), with highs reaching up to 30°C (87°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec565557616367727372686256
Data source: Temperature data for El Cajon 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 El Cajon

In El Cajon in May, the precipitation amount is 21 mm (0.8 in) over a span of 4 days.

May Precipitation Trends in El Cajon

The chart displays monthly precipitation patterns in El Cajon, 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 El Cajon, May typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec56685124222314142965
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in El Cajon

In El Cajon in May, humidity is 46%. With an average temperature of 17°C (63°F), this humidity feels like a mild embrace—comfortable for exploring the sights, though you might notice a slight heaviness in the air that encourages a leisurely pace as you take in the vibrant surroundings.

May Average Humidity in El Cajon

This chart illustrates the average monthly humidity levels in El Cajon, 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 El Cajon is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in El Cajon

In El Cajon in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in El Cajon.

Maximum UV Index Levels in El Cajon for May

The chart shows the monthly maximum UV Index (UVI) for El Cajon 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 El Cajon typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
Data source: El Cajon 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 El Cajon Compares to Other Months

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

This table compares monthly weather conditions in El Cajon, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)56 mm (2.2 inches)72%moderate
February Weather13°C (56°F)68 mm (2.7 inches)77%high
March Weather14°C (57°F)51 mm (2.0 inches)67%very high
April Weather16°C (61°F)24 mm (0.9 inches)56%very high
May Weather17°C (63°F)21 mm (0.8 inches)46%extreme
June Weather19°C (67°F)2 mm (0.1 inches)48%extreme
July Weather22°C (72°F)3 mm (0.1 inches)46%extreme
August Weather23°C (74°F)1 mm (0.1 inches)42%very high
September Weather22°C (72°F)4 mm (0.1 inches)52%very high
October Weather20°C (68°F)14 mm (0.6 inches)58%high
November Weather17°C (62°F)29 mm (1.1 inches)66%moderate
December Weather14°C (57°F)65 mm (2.5 inches)74%moderate

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