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April Weather in San Francisco, Peru

Last updated: August 27, 2025

In April, the average temperature in San Francisco, Peru hovers around 20°C (68°F), making it a pleasantly mild time of year. Expect a minimum temperature of 15°C (60°F) and a maximum of 26°C (79°F). However, don’t forget your umbrella, as there’s an average precipitation of 20 mm (0.8 in) over 6 days. The air can be quite humid too, with an average humidity level of 89%.

April Temperature in San Francisco

In April in San Francisco, the average temperature is 20°C (68°F). Maximums can reach 26°C (79°F), and minimums can be as low as 15°C (60°F). This pleasant climate makes San Francisco an ideal destination for travelers seeking comfortable weather and enjoyable outdoor activities.

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

The chart illustrates April temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, April typically has an average temperature of 20°C (68°F), with highs reaching up to 26°C (79°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec686969686664646464646567
Data source: Temperature data for San Francisco 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 Francisco

In San Francisco in April, the precipitation amount is 20 mm (0.8 in) over the course of 6 days.

April Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, 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 Francisco, April typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec73845820421125513
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Francisco

In San Francisco in April, humidity is 89%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making each step feel heavier and the air thick with moisture, which can be quite uncomfortable for traveling.

April Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, 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 Francisco is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%90%89%83%69%56%51%53%68%82%87%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Francisco

In San Francisco 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 Francisco, you can check here.

Maximum UV Index Levels in San Francisco for April

The chart shows the monthly maximum UV Index (UVI) for San Francisco 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 Francisco typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151615141110111214151615
Data source: San Francisco 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 Francisco Compares to Other Months

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

This table compares monthly weather conditions in San Francisco, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (69°F)73 mm (2.9 inches)89%extreme
February Weather21°C (69°F)84 mm (3.3 inches)89%extreme
March Weather21°C (70°F)58 mm (2.3 inches)90%extreme
April Weather20°C (68°F)20 mm (0.8 inches)89%extreme
May Weather19°C (66°F)4 mm (0.2 inches)83%extreme
June Weather18°C (65°F)1 mm (0.1 inches)69%very high
July Weather18°C (64°F)1 mm (0.0 inches)56%extreme
August Weather18°C (64°F)0 mm (0.0 inches)50%extreme
September Weather18°C (64°F)2 mm (0.1 inches)53%extreme
October Weather18°C (65°F)5 mm (0.2 inches)68%extreme
November Weather19°C (66°F)5 mm (0.2 inches)81%extreme
December Weather19°C (67°F)13 mm (0.5 inches)87%extreme

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