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April Weather in San Francisco, Mexico

Last updated: August 27, 2025

In April, the average temperature in San Francisco, Mexico hovers around 23°C (74°F). While you can expect the mercury to dip as low as 10°C (51°F), it can soar up to 39°C (102°F) on hotter days. With an average humidity of 80%, prepare for a humid experience. Don’t forget your umbrella—21 mm (0.8 in) of precipitation can be expected over approximately 5 days this month!

April Temperature in San Francisco

In April in San Francisco, the average temperature is 23°C (74°F). Maximums can reach 39°C (102°F) and minimums can be as low as 10°C (51°F). This makes San Francisco a perfect destination for travelers seeking warm weather, but it's wise to pack for both heat 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 23°C (74°F), with highs reaching up to 39°C (102°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec606469747776767674706561
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 21 mm (0.8 in) spread over a period of 5 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 21 mm (0.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec11131921551069175124113219
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 80%. With an average temperature of 23°C (74°F), this humidity feels like walking through a warm, damp blanket, making travel feel sticky and muggy, where every step leaves you yearning for a cool breeze.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
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.
JanFebMarAprMayJunJulAugSepOctNovDec810131413131413131197
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 Weather15°C (60°F)11 mm (0.5 inches)88%very high
February Weather18°C (65°F)13 mm (0.5 inches)86%very high
March Weather20°C (69°F)19 mm (0.7 inches)83%extreme
April Weather23°C (74°F)21 mm (0.8 inches)80%extreme
May Weather25°C (78°F)55 mm (2.2 inches)82%extreme
June Weather25°C (77°F)106 mm (4.2 inches)79%extreme
July Weather24°C (76°F)91 mm (3.6 inches)72%extreme
August Weather24°C (76°F)75 mm (3.0 inches)74%extreme
September Weather23°C (74°F)124 mm (4.9 inches)84%extreme
October Weather21°C (70°F)113 mm (4.4 inches)92%extreme
November Weather18°C (65°F)21 mm (0.8 inches)91%very high
December Weather16°C (61°F)9 mm (0.3 inches)91%high

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