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April Weather in San Juan, Peru

Last updated: August 27, 2025

In San Juan, Peru, the average temperature in April hovers around 12°C (54°F). Expect temperatures to range from a chilly 6°C (43°F) to a pleasant 20°C (69°F). During this period, precipitation averages 348 mm (13.7 in), spread over 27 days, contributing to an average humidity of 85%. Prepare for a month that's both cool and wet!

April Temperature in San Juan

In April in San Juan, the average temperature is 12°C (54°F). Maximums can reach 20°C (69°F), while minimums can drop to as low as 6°C (43°F). This makes it a great time for travelers to explore, as the mild weather is perfect for outdoor activities and sightseeing.

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 12°C (54°F), with highs reaching up to 20°C (69°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec545453545454545454545454
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 total precipitation amount is 348 mm (13.7 in) occurring over the span of 27 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 348 mm (13.7 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec304392599349189704348154299290413
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 85%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making traveling not only uncomfortable but also exhausting as the damp air clings to your skin and slows your movements.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
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 18, which corresponds to an extreme exposure category. This means that the time to burn is just 10 minutes. For more detailed information, you can check the hourly UV index in San Juan.

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 18, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171819181513141417181616
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 (54°F)304 mm (12.0 inches)83%extreme
February Weather12°C (54°F)392 mm (15.4 inches)81%extreme
March Weather12°C (53°F)599 mm (23.6 inches)88%extreme
April Weather12°C (54°F)348 mm (13.7 inches)85%extreme
May Weather12°C (54°F)188 mm (7.4 inches)78%extreme
June Weather12°C (54°F)70 mm (2.8 inches)62%extreme
July Weather12°C (54°F)43 mm (1.7 inches)44%extreme
August Weather12°C (55°F)47 mm (1.9 inches)38%extreme
September Weather12°C (54°F)154 mm (6.1 inches)42%extreme
October Weather12°C (54°F)299 mm (11.8 inches)58%extreme
November Weather12°C (54°F)290 mm (11.4 inches)69%extreme
December Weather12°C (54°F)413 mm (16.2 inches)82%extreme

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