August Weather in San Jose, United States

Last updated: February 24, 2025

August in San Jose, United States showcases a vibrant summer climate, with temperatures soaring to a maximum of 39°C (102°F), while the average rests comfortably at 19°C (67°F) and dips to a refreshing minimum of 11°C (52°F). This month is marked by uninterrupted sunshine, as evidenced by a total precipitation of 0 mm (0.0 in) and a modest humidity level of 54%. With zero rainy days, August offers perfect conditions for outdoor activities and exploration in this beautiful region.

August Temperature in San Jose

In August, San Jose basks in the warm embrace of summer, with temperatures reaching a maximum of 39°C (102°F), making it one of the hottest months of the year. The minimum temperature settles at 11°C (52°F), providing a comfortable early morning chill. With an average temperature of 19°C (67°F), the city experiences balmy evenings perfect for outdoor activities. This month marks a noticeable increase from the earlier summer months, signifying a trend where temperatures peak just before they begin to dip in September. The blend of warm days and cooler nights creates an inviting atmosphere for both residents and visitors to enjoy all that San Jose has to offer.

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.
JanFebMarAprMayJunJulAugSepOctNovDec505153565964666766635550
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 August, San Jose experiences a noticeable dry spell, with 0 mm of precipitation recorded over the entire month, consistent with the preceding July. This pattern continues the region's trend of experiencing a significant drop in rainfall as summer takes hold, following the wetter months of winter and early spring. Prior to August, precipitation peaked in January with 145 mm, gradually tapering off as the year progressed. The landscape during this time transforms into a decidedly dry environment, a stark contrast to the rain-soaked months of earlier in the year. With no days of recorded precipitation in both July and August, residents and visitors alike enjoy dry, sunny weather, but they also witness a clear shift towards the drier summer months that characterize San Jose's climate.

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.
JanFebMarAprMayJunJulAugSepOctNovDec145133114372410132556116
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 August, San Jose experiences its lowest humidity level of the year at 54%, marking a noticeable trend of decreasing humidity throughout the summer months. Starting the year with high humidity figures around 82% in January and February, the levels gradually decline, hitting 58% in July before reaching their August low. The shift towards drier conditions continues into September, when humidity slightly increases to 55%, indicating a gradual return to the moister months of fall. Overall, the August humidity is part of a clear seasonal pattern, reflecting the transition from the dampness of winter to the dry warmth of summer.

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, allowing you to see how August's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Jose

In August, San Jose experiences a UV Index of 10, categorized as very high, which signifies a sharp decline from the peak month of July but still requires caution. With a burn time of just 15 minutes, it's essential for residents and visitors to take protective measures against the sun's rays. This month continues a trend of elevated UV exposure that began in May, where the index reached an extreme level of 11. As summer wanes, August serves as a reminder to remain vigilant about sun safety while enjoying the warm days. For more detailed information on UV exposure throughout the year, check out San Jose UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
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.

August Sunshine in San Jose

In August, San Jose basks in the warmth of summer with an impressive 348 hours of sunshine, a vibrant continuation of the sun's dominance. This month, while a dip from the peak of July’s 379 hours, still showcases plenty of bright days that give residents and visitors ample opportunity to enjoy outdoor activities. Following a steady climb from January’s modest 162 hours of sunshine, the trend demonstrates how summer reigns supreme in the region, peaking during the late spring and summer months before gently tapering off in the fall. September and October will see a gradual decrease, yet the abundance of sunlight in August serves as a delightful reminder of summer's lingering embrace in the Bay Area.

Monthly Sunshine Duration in San Jose: August Highlighted

The August sunshine duration represents the total number of hours San Jose experiences direct sunlight during the month of August, excluding cloudy or obstructed periods. This chart compares the sunshine duration of August with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec162h222h269h303h360h373h379h348h310h286h233h206h
Data source: San Jose August Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Jose During August

In San Jose, August stands out as a peak point in the summer with an impressive 84% chance of sunny weather. This marks a notable increase from earlier months, signaling the transition into the warmest period of the year. Following the already high probabilities of sunshine in May, June, and July, August caps off the summer with its most promising forecast. As the summer draws to a close, the likelihood of sunny days begins to taper off slightly into September, yet remains significantly high at 80%. Overall, August's radiant weather not only enhances outdoor activities but also invites residents and visitors alike to bask in the beauty of the Californian sun.

Percentage of Sunny Days in August in San Jose

The chart illustrates the percentage of sunny days in San Jose throughout the year, with August highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often San Jose experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec44%57%56%56%75%74%75%84%80%58%55%40%
Data source: San Jose August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Jose in August

As summer gradually fades, August in San Jose sees a delightful return to shorter days, with daylight lasting 13 hours. This month marks the beginning of a subtle downward trend in daylight hours following the peak of 14 hours experienced in the preceding summer months of June and July. The transition becomes more pronounced as September approaches, when daylight dips to 12 hours. This pattern reflects a natural rhythm of the seasons, inviting residents to relish the warm evenings that linger but hinting at the cooler, shorter days ahead. As the lush landscapes bask in the golden glow of August, the gradual decrease in daylight reminds us of the cyclic beauty of nature.

Average Daylight Hours in San Jose for August

The chart illustrates the variation in daylight duration in San Jose throughout the year, with August highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 55m10h 49m11h 59m13h 10m14h 10m14h 39m14h 23m13h 30m12h 21m11h 10m10h 9m9h 38m
Data source: San Jose daylight hours, calculated by summing the hours between sunrise and sunset for each day.

August Winds in San Jose

In August, San Jose experiences its calmest winds of the year, with an average speed of just 1.5 m/s (3 mph). This gentle breeze contrasts sharply with the spring and early summer months, where average wind speeds hover around 2.1 m/s (5 mph). As the summer peaks in July with slightly stronger winds, August signals a shift towards more tranquil conditions. Interestingly, this trend of decreasing wind speed continues into early autumn, before picking up again in October. Overall, August's mild winds invite a sense of relaxation, making it a perfect time to enjoy outdoor activities in the warm California sun.

Average August Wind Speed in San Jose

The chart displays monthly wind speed patterns in San Jose, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.12.22.11.92.22.11.61.5 m/s1.62.11.72.2
Data source: San Jose August wind data, generated using information from the Copernicus Climate Change Service.

How August Weather in San Jose Compares to Other Months

The weather in San Jose changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in San Jose and find detailed weather information for every month.

August and January present strikingly different weather patterns. In August, temperatures soar with a minimum of 11°C (52°F) and an average high of 39°C (102°F), accompanied by a complete lack of precipitation, creating a dry and warm atmosphere with humidity at 54%. In contrast, January experiences much cooler temperatures, ranging from a minimum of 0°C (32°F) to a maximum of 24°C (75°F), along with a significant amount of precipitation at 145 mm (5.7 in) over eight days, resulting in a more humid environment with 82% humidity. For a deeper dive into January weather specifics, check out San Jose weather in January.

August and February in San Jose present contrasting weather experiences. August boasts notably higher temperatures, with a minimum of 11°C (52°F) and a scorching maximum of 39°C (102°F), while February sees cooler temperatures ranging from -1°C (30°F) to a maximum of 25°C (77°F). August is characterized by its dry conditions, featuring no recorded precipitation, and an average humidity of 54%. In stark contrast, February is much wetter, with an average precipitation of 133 mm (5.2 in) spread across 8 days and a higher humidity level of 84%. For more detailed information, you can check out San Jose weather in February.

When comparing the weather in August and March, notable differences emerge. August tends to be much warmer, with temperatures ranging from a minimum of 11°C (52°F) to a scorching maximum of 39°C (102°F), along with low precipitation and humidity levels averaging 54%. In contrast, March experiences cooler temperatures, ranging from a minimum of 1°C (34°F) to a maximum of 26°C (79°F) and is significantly wetter, with 114 mm (4.5 in) of precipitation over 12 days and high humidity at 82%. For a detailed forecast, you can check out San Jose weather in March.

When comparing the weather in August and April, notable differences emerge. August typically enjoys warmer conditions, with average temperatures around 19°C (67°F) and highs reaching up to 39°C (102°F), complemented by dry air and no recorded precipitation. In contrast, April features cooler temperatures, averaging 13°C (56°F), with a maximum of 31°C (88°F), and is marked by a higher humidity level of 78% and about 37 mm (1.4 in) of rainfall over four days. For a more detailed overview of April weather, you can visit San Jose weather in April.

August and May present contrasting weather patterns, with August characterised by significantly warmer temperatures and minimal precipitation. In August, temperatures range from a cool 11°C (52°F) at night to a scorching maximum of 39°C (102°F), accompanied by low humidity at 54% and no recorded rainfall. In sharp contrast, May experiences milder temperatures, with a minimum of 5°C (40°F) and a maximum reaching 32°C (90°F). Additionally, May sees some rainfall, averaging 24 mm (0.9 in) over just two days, and higher humidity at 71%. For more detailed information, you can check out San Jose weather in May.

In comparing the weather of August and June, August generally offers warmer temperatures, with a minimum of 11°C (52°F) and average highs reaching up to 39°C (102°F), while June's temperatures range from a minimum of 8°C (47°F) to a maximum of 37°C (99°F). Both months experience very little precipitation, with August seeing no rainfall at all, similar to June's sparse total of only 1 mm (0.0 in). However, humidity levels are slightly lower in August at 54% compared to June's 64%, resulting in a drier feel overall. For a closer look at June weather specifics, check out San Jose weather in June.

In comparing the weather between July and August, both months exhibit dry conditions with no recorded precipitation. August experiences a slightly wider temperature range, with minimums of 11°C (52°F) and maximums reaching up to 39°C (102°F), compared to July's range of 10°C (50°F) to a maximum of 34°C (93°F). The average temperature remains similar at 19°C (67°F) for both months, but August is notably hotter overall. Additionally, August's humidity is slightly lower at 54%, while July has a humidity level of 58%. For a detailed look at July's weather conditions, you can visit San Jose weather in July.

August weather is characterized by warm temperatures, with a minimum of 11°C (52°F), averaging 19°C (67°F), and peaking at a high of 39°C (102°F). Notably, there is no recorded precipitation during this month, resulting in dry conditions and a humidity level of 54%. In contrast, September sees a slight cooling, with a minimum temperature of 7°C (45°F) and the same average of 19°C (67°F), but it can reach a maximum of 41°C (106°F). Unlike August, September experiences a small amount of rain, with 3 mm (0.1 in) of precipitation, although it still has no recorded rainy days. Humidity increases slightly to 55%. For more detailed information, you can check San Jose weather in September.

August weather is characterized by higher temperatures, with a minimum of 11°C (52°F) and an average of 19°C (67°F), peaking at a scorching 39°C (102°F). In contrast, October sees much cooler temperatures, with a minimum of 5°C (42°F) and an average of 17°C (63°F), and a maximum of 34°C (94°F). While August is quite dry with no recorded precipitation, October experiences a bit more rain, accumulating 25 mm (1.0 in) over just one day. The humidity also rises slightly in October to 62%, compared to August's 54%. For a detailed look at October weather specifics, check out San Jose weather in October.

August and November present strikingly different weather conditions. In August, temperatures soar with a minimum of 11°C (52°F) and soaring maximums up to 39°C (102°F), while the month remains dry with no recorded precipitation and an average humidity of 54%. In contrast, November experiences much cooler temperatures, ranging from a minimum of 1°C (34°F) to a maximum of 28°C (83°F), accompanied by an increase in precipitation averaging 56 mm (2.2 inches) over five days, which elevates the humidity to 78%. For a closer look at November weather specifics, you can check San Jose weather in November.

In August, the weather in San Jose is typically warm and dry, with temperatures ranging from a minimum of 11°C (52°F) to a scorching maximum of 39°C (102°F) and an average of 19°C (67°F). The month is characterized by absolutely no precipitation and a comfortable humidity level of 54%.

In contrast, December brings much cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 24°C (76°F), averaging around 10°C (50°F). This month sees significant precipitation, totaling 116 mm (4.6 in) over 9 days, and the humidity rises to 80%. The shift from August to December highlights a transformation from dry heat to a wetter, chillier climate. For more details, you can refer to San Jose weather in December.

Compare San Jose's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in San Jose

In August, San Jose experiences a distinct warmth that sets it apart from the rest of the year, showcasing maximum temperatures that can soar to impressive heights. Unlike the cooler months, this time of year boasts abundant sunshine and dry conditions, with no recorded precipitation. The average temperature strikes a comfortable balance, making outdoor activities particularly enjoyable. Moreover, the humidity levels remain moderate, adding a pleasant feel to the heat. Overall, August is a vibrant month that invites residents and visitors alike to soak up the sun and embrace the quintessential Californian summer. For more on the yearly climate patterns, check out San Jose Climate.