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April Weather in San Jose, United States

Last updated: June 24, 2025

In April, the average temperature in San Jose, United States hovers around 11°C (51°F), with extremes ranging from a chilly -6°C (21°F) to a warm 26°C (79°F). During this month, expect 22 mm (0.9 in) of precipitation spread over 4 days, while the air maintains an average humidity of 60%.

April Temperature in San Jose

In April in San Jose, the average temperature is 11°C (51°F), with maximums reaching 26°C (79°F) and minimums dropping as low as -6°C (21°F). This range makes it essential for travelers to pack both warm and light clothing to accommodate the varying weather conditions.

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

The chart illustrates April temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, April typically has an average temperature of 11°C (51°F), with highs reaching up to 26°C (79°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec293242516070727165524132
Data source: Temperature data for San Jose 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 Jose

In San Jose in April, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.

April Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 Jose, April typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec242424231815342427272319
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Jose

In San Jose in April humidity is 60%. With an average temperature of 11°C (51°F), this humidity feels like a cool, damp mist that clings to your skin, making outdoor exploration refreshing yet slightly chilly.

April Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 Jose is approximately 60%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%66%60%57%55%57%65%72%78%81%79%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Jose

In San Jose in April, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for April

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 Jose typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5810111213131211864
Data source: San Jose 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 Jose Compares to Other Months

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

This table compares monthly weather conditions in San Jose, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)24 mm (0.9 inches)78%moderate
February Weather0°C (33°F)24 mm (0.9 inches)79%very high
March Weather6°C (43°F)24 mm (1.0 inches)66%very high
April Weather11°C (51°F)22 mm (0.9 inches)60%extreme
May Weather16°C (60°F)18 mm (0.7 inches)57%extreme
June Weather21°C (70°F)15 mm (0.6 inches)55%extreme
July Weather22°C (73°F)34 mm (1.3 inches)56%extreme
August Weather21°C (71°F)23 mm (0.9 inches)65%extreme
September Weather18°C (65°F)27 mm (1.0 inches)72%extreme
October Weather11°C (52°F)27 mm (1.1 inches)78%very high
November Weather5°C (41°F)23 mm (0.9 inches)81%high
December Weather0°C (32°F)19 mm (0.7 inches)79%moderate

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