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April Weather in San Ysidro, United States

Last updated: June 24, 2025

In April, the average temperature in San Ysidro, United States is a pleasant 20°C (67°F). However, temperatures can vary, with a minimum reaching 3°C (38°F) and a maximum soaring to 33°C (92°F). Rain is minimal, with just 3 mm (0.1 in) expected over 0 days, and the average humidity sits comfortably at 55%.

April Temperature in San Ysidro

In April in San Ysidro, the average temperature is 20°C (67°F). Maximums can reach 33°C (92°F), while minimums can be as low as 3°C (38°F). This makes it a great time to visit for travelers seeking mild weather and pleasant experiences.

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

The chart illustrates April 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, April typically has an average temperature of 20°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°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.

April Precipitation in San Ysidro

In San Ysidro in April, the precipitation amount is 3 mm (0.1 in) during a total of 0 days.

April Precipitation Trends in San Ysidro

The chart displays monthly precipitation patterns in San Ysidro, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In San Ysidro, April typically receives around 3 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1315163422313324211313
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Ysidro

In San Ysidro in April humidity is 55%. With an average temperature of 20°C (67°F), this humidity feels like a comfortable embrace for traveling, creating a pleasant atmosphere that allows you to explore without feeling weighed down.

April Average Humidity in San Ysidro

This chart illustrates the average monthly humidity levels in San Ysidro, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in San Ysidro

In San Ysidro in April, 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 April

The chart shows the monthly maximum UV Index (UVI) for San Ysidro in April, 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 April, the maximum UV index in San Ysidro typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121213121211865
Data source: San Ysidro April 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 April 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 April’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 April’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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