nomadseason

March Weather in San Ysidro, United States

Last updated: June 24, 2025

In March, the average temperature in San Ysidro, United States hovers around 14°C (58°F). Expect a minimum of -1°C (30°F) and a maximum of 31°C (88°F) for a diverse range of weather. Precipitation is light, with an average of 16 mm (0.6 in) falling over just 2 days, and the air carries an average humidity of 65%.

March Temperature in San Ysidro

In March in San Ysidro, the average temperature is 14°C (58°F). Maximum temperatures can reach 31°C (88°F), while minimum temperatures can drop as low as -1°C (30°F). With such a wide range in temperatures, travelers should be prepared for both warm and chilly moments during their visit.

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

The chart illustrates March 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, March typically has an average temperature of 14°C (58°F), with highs reaching up to 31°C (88°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec455058677583838277665546
Data source: Temperature data for San Ysidro 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.

March Precipitation in San Ysidro

In San Ysidro in March, the precipitation amount is 16 mm (0.6 in) over a period of 2 days.

March Precipitation Trends in San Ysidro

The chart displays monthly precipitation patterns in San Ysidro, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In San Ysidro, March typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1315163422313324211313
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

March Humidity in San Ysidro

In San Ysidro in March, humidity is 65%. With an average temperature of 14°C (58°F), this humidity feels like a mild embrace, creating a slightly damp atmosphere that's comfortable for exploring, but travelers should be prepared for the occasional sticky moment.

March Average Humidity in San Ysidro

This chart illustrates the average monthly humidity levels in San Ysidro, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in San Ysidro is approximately 65%, 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 March generated using information from the Copernicus Climate Change Service.

March UV Index in San Ysidro

In San Ysidro in March, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Ysidro.

Maximum UV Index Levels in San Ysidro for March

The chart shows the monthly maximum UV Index (UVI) for San Ysidro in March, 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 March, the maximum UV index in San Ysidro typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121213121211865
Data source: San Ysidro March 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 March 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 March’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 March’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

Compare San Ysidro's Climate with Cities Worldwide