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April Weather in San Marcos, United States

Last updated: June 24, 2025

In April, the average temperature in San Marcos, United States is a mild 16°C (62°F). Expect a range, with minimums reaching 8°C (46°F) and maximums soaring to 34°C (93°F). During this month, anticipate about 32 mm (1.3 in) of precipitation spread over 3 days, paired with an average humidity of 56%.

April Temperature in San Marcos

In April in San Marcos, the average temperature is 16°C (62°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 8°C (46°F). It's an excellent time for travelers to enjoy a mix of warm days and cooler evenings, making it ideal for outdoor activities.

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

The chart illustrates April temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, April typically has an average temperature of 16°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec565657616368737573686356
Data source: Temperature data for San Marcos 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 Marcos

In San Marcos in April, the total precipitation amount is 32 mm (1.3 in) over a span of 3 days.

April Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, 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 Marcos, April typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec70786832243415123570
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Marcos

In San Marcos in April, humidity is 56%. With an average temperature of 16°C (62°F), this humidity feels like a gentle embrace, making for a pleasant and refreshing atmosphere for traveling.

April Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, 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 Marcos is approximately 56%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in San Marcos

In San Marcos in April, 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 Marcos.

Maximum UV Index Levels in San Marcos for April

The chart shows the monthly maximum UV Index (UVI) for San Marcos 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 Marcos typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111010754
Data source: San Marcos 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 Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)70 mm (2.8 inches)72%moderate
February Weather13°C (56°F)78 mm (3.1 inches)77%high
March Weather14°C (58°F)68 mm (2.7 inches)67%very high
April Weather16°C (62°F)32 mm (1.3 inches)56%very high
May Weather17°C (63°F)24 mm (0.9 inches)46%extreme
June Weather20°C (68°F)3 mm (0.1 inches)48%extreme
July Weather23°C (73°F)4 mm (0.2 inches)46%extreme
August Weather24°C (75°F)1 mm (0.1 inches)42%very high
September Weather23°C (73°F)5 mm (0.2 inches)52%very high
October Weather20°C (69°F)12 mm (0.5 inches)58%high
November Weather17°C (63°F)34 mm (1.4 inches)66%moderate
December Weather14°C (57°F)70 mm (2.7 inches)74%moderate

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