August weather forecast
San Jose, CA

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A sunset panorama of the lit city of San Jose, California
A sunset panorama of the lit city of San Jose, California

Weather in August

In August, the weather in San Jose remains in the firm grip of summer. The temperature continues to reside on the warmer side, and rainfall levels remain minimal. The month maintains warm temperatures from July, with humidity levels showing a slight increase. Even though daylight hours begin to shorten, the summer mood still dominates the city in August.

Temperature

San Jose, California, records an average high-temperature of a still warm 81.9°F (27.7°C) as August arrives, nearly mirroring the previous month's climate. August presents a pronounced difference from daytime highs, with a consistent average low-temperature of 56.5°F (13.6°C).

Heat index

In August, the average heat index is evaluated at 84.2°F (29°C). If exposure and activity are sustained, they might cause a feeling of weariness, resulting in heat cramps.
Given the heat index, its values are aligned with shaded sites and gentle winds. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a composite of temperature and humidity figures to convey how warm it feels. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.

Humidity

In August, the average relative humidity in San Jose is 62%.

Rainfall

The months with the least rainfall in San Jose are June through August Rain falls for 0.4 days and accumulates 0.04" (1mm) of rain.

Daylight

In August, the average length of the day in San Jose is 13h and 33min.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:14 pm. On the last day of August, in San Jose, sunrise is at 6:37 am and sunset at 7:37 pm PDT.

Sunshine

In August, the average sunshine is 12h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 6 during August leads to these instructions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

What are August temperatures in San Jose?

The high-temperature in San Jose, California, during August is 81.9°F (27.7°C) and the low-temperature is 56.5°F (13.6°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is evaluated at 84.2°F (29°C).

What is the average humidity in August in San Jose?

The average relative humidity in August in San Jose is 62%.

What is the driest month in San Jose?

The months with the least rainfall in San Jose are June through August Rain falls for 0.4 days and accumulates 0.04" (1mm) of rain.

How much does it rain in San Jose in August?

In San Jose, California, during August, the rain falls for 0.4 days and regularly aggregates up to 0.04" (1mm) of precipitation.

How many hours of daylight does San Jose have in August?

In August, the average day length in San Jose is 13h and 33min.

When are sunrise and sunset in August in San Jose?

On the first day of August in San Jose, California, sunrise is at 6:12 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 7:37 pm PDT.

How long on average sun shines in August in San Jose?

In August, the average sunshine duration in San Jose, California, is 12h.

When is the highest UV index in San Jose?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the UV index intensity in August in San Jose?

The average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
San Jose, CA

Average temperature in August - San Jose, CA
  • Average high temperature in August: 81.9°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is December (56.5°F).

  • Average low temperature in August: 56.5°F

The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in August
San Jose, CA

Average pressure in August - San Jose, CA
  • Average pressure in August: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

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Average wind speed in August
San Jose, CA

Average wind speed in August - San Jose, CA
  • Average wind speed in August: 4.5mph

The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.4mph).

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Average humidity in August
San Jose, CA

Average humidity in August - San Jose, CA
  • Average humidity in August: 62%

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (60%).

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Average rainfall in August
San Jose, CA

Average rainfall in August - San Jose, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in August
San Jose, CA

Average rainfall days in August - San Jose, CA
  • Average rainfall days in August: 0.4 days

The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.4 days).

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Average daylight in August /
Average sunshine in August
San Jose, CA

Average daylight in August / Average sunshine in August - San Jose, CA
  • Average daylight in August: 13h and 3min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in August: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in August
San Jose, CA

Average sunshine days in August - San Jose, CA
  • Average sunshine days in August: 29.7 days

The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in August
San Jose, CA

Average UV index in August - San Jose, CA
  • Average UV index in August: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in August
San Jose, CA

Average cloud cover in August - San Jose, CA
  • Average cloud cover in August: 7

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).

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Average visibility in August
San Jose, CA

Average visibility in August - San Jose, CA
  • Average visibility in August: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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San Jose, California, USA

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