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August Weather in San Jose, United States

Last updated: June 24, 2025

In San Jose, United States, the average temperature in August hovers at a warm 29°C (85°F). Expect a minimum of 19°C (66°F) and a scorching maximum of 41°C (106°F). There’s a light precipitation of 22 mm (0.9 in) spread over about 4 days, while the average humidity remains at a comfortable 53%. Enjoy the balance of warmth and moisture!

August Temperature in San Jose

In August in San Jose, the average temperature is 29°C (85°F). The maximum can reach 41°C (106°F), and the minimum can be as low as 19°C (66°F). Travelers should be prepared for warm weather and pack accordingly to enjoy their stay comfortably.

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

The chart illustrates August 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, August typically has an average temperature of 29°C (85°F), with highs reaching up to 41°C (106°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec465058687686868579685848
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.

August Precipitation in San Jose

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

August Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In San Jose, August typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec233216234452228132025
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Jose

In San Jose in August humidity is 53%. With an average temperature of 29°C (85°F), this humidity feels like a warm embrace, creating a somewhat sticky but comfortable atmosphere that's perfect for leisurely strolls or exploring local attractions while staying hydrated.

August Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in San Jose is approximately 53%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%82%68%55%45%37%43%53%66%72%81%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Jose

In San Jose in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for August

The chart shows the monthly maximum UV Index (UVI) for San Jose in August, 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 August, the maximum UV index in San Jose typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710111212121211864
Data source: San Jose August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)23 mm (0.9 inches)81%moderate
February Weather10°C (50°F)32 mm (1.2 inches)82%high
March Weather15°C (59°F)16 mm (0.6 inches)68%very high
April Weather20°C (68°F)2 mm (0.1 inches)55%extreme
May Weather24°C (76°F)3 mm (0.1 inches)45%extreme
June Weather30°C (86°F)4 mm (0.2 inches)37%extreme
July Weather30°C (86°F)45 mm (1.8 inches)43%extreme
August Weather29°C (85°F)22 mm (0.9 inches)53%extreme
September Weather26°C (79°F)28 mm (1.1 inches)66%extreme
October Weather20°C (68°F)13 mm (0.5 inches)72%very high
November Weather14°C (58°F)20 mm (0.8 inches)81%high
December Weather9°C (48°F)25 mm (1.0 inches)84%moderate

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