April Weather in San Francisco, Mexico

Last updated: August 27, 2025

In April, the average temperature in San Francisco, Mexico hovers around 21°C (70°F). Expect variations, with a minimum of 6°C (43°F) and a maximum of 34°C (94°F). Be prepared for a bit of rain, as the precipitation can reach 12 mm (0.5 in) over the course of 3 days. With an average humidity of 58%, it’s a pleasant time to enjoy the climate!

April Temperature in San Francisco

In April in San Francisco, the average temperature is 21°C (70°F), with maximums reaching 34°C (94°F) and minimums dropping as low as 6°C (43°F). This varied climate makes it an ideal destination for travelers looking to experience a mix of warm days and cooler evenings.

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 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (43°F).

Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.

April Precipitation in San Francisco

In San Francisco in April, the precipitation amount is 12 mm (0.5 in) during a span of 3 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 12 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

April Humidity in San Francisco

In San Francisco in April, humidity is 58%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, creating a tropical atmosphere that's perfect for leisurely strolls but may require frequent breaks to stay hydrated during your travels.

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 58%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	14°C (58°F)	6 mm (0.2 inches)	74%	very high
February Weather	16°C (62°F)	7 mm (0.3 inches)	65%	extreme
March Weather	19°C (66°F)	11 mm (0.4 inches)	58%	extreme
April Weather	21°C (70°F)	12 mm (0.5 inches)	58%	extreme
May Weather	22°C (71°F)	42 mm (1.7 inches)	67%	extreme
June Weather	20°C (68°F)	149 mm (5.9 inches)	76%	extreme
July Weather	19°C (67°F)	108 mm (4.3 inches)	67%	extreme
August Weather	19°C (67°F)	99 mm (3.9 inches)	68%	extreme
September Weather	18°C (65°F)	164 mm (6.4 inches)	81%	extreme
October Weather	18°C (64°F)	63 mm (2.5 inches)	83%	extreme
November Weather	16°C (60°F)	19 mm (0.8 inches)	84%	very high
December Weather	14°C (58°F)	4 mm (0.2 inches)	81%	very high