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April Weather in San Juan, Mexico

Last updated: August 27, 2025

In April, the average temperature in San Juan, Mexico is a pleasant 20°C (68°F). Daily temperatures can vary, with minimums dipping to 5°C (41°F) and maximums soaring to 33°C (91°F). Expect a bit of moisture, as there’s an average precipitation of 7 mm (0.3 in) over just 2 days. The air will be comfortably dry, with an average humidity of 47%.

April Temperature in San Juan

In April in San Juan, the average temperature is 20°C (68°F). Maximums can reach 33°C (91°F) and minimums can be as low as 5°C (41°F). Be prepared for a range of temperatures and pack accordingly to enjoy your travels!

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

The chart illustrates April temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, April typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec545964687170686865635955
Data source: Temperature data for San Juan 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 Juan

In San Juan in April, the precipitation amount is 7 mm (0.3 in) over a period of 2 days.

April Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, 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 Juan, April typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec17957197712065119421612
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Juan

In San Juan in April, humidity is 47%. With an average temperature of 20°C (68°F), this humidity feels like a comfortable backdrop for traveling, allowing for enjoyable outdoor activities without the overwhelming stickiness often associated with higher humidity levels.

April Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, 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 Juan is approximately 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%64%49%47%55%77%82%83%86%83%80%83%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Juan

In San Juan in April, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Juan, you can check here.

Maximum UV Index Levels in San Juan for April

The chart shows the monthly maximum UV Index (UVI) for San Juan 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 Juan typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec8111314151414141412108
Data source: San Juan 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 Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (55°F)17 mm (0.7 inches)71%very high
February Weather15°C (59°F)9 mm (0.3 inches)64%extreme
March Weather18°C (65°F)5 mm (0.2 inches)49%extreme
April Weather20°C (68°F)7 mm (0.3 inches)47%extreme
May Weather22°C (72°F)19 mm (0.8 inches)55%extreme
June Weather21°C (71°F)77 mm (3.0 inches)77%extreme
July Weather20°C (68°F)120 mm (4.7 inches)82%extreme
August Weather20°C (69°F)65 mm (2.6 inches)83%extreme
September Weather18°C (65°F)119 mm (4.7 inches)86%extreme
October Weather17°C (64°F)42 mm (1.7 inches)83%extreme
November Weather15°C (59°F)15 mm (0.6 inches)80%very high
December Weather13°C (55°F)12 mm (0.5 inches)83%very high

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