August weather forecast
San Jose, CA

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

August, the last month of the summer in San Jose, is another warm month, with an average temperature ranging between min 56.5°F (13.6°C) and max 81.9°F (27.7°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still moderately hot 81.9°F (27.7°C). In San Jose, the average low-temperature is 56.5°F (13.6°C).

Heat index

The average heat index in August is calculated to be 84.2°F (29°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like metabolic differences, differences in body mass, height, and shape, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

The months with the least rainfall 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 8:15 pm. On the last day of August, in San Jose, California, sunrise is at 6:37 am and sunset at 7:38 pm PDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in August in San Jose?

The average high-temperature, in August, is 81.9°F (27.7°C), while the average low-temperature is 56.5°F (13.6°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 84.2°F (29°C).

What is the average humidity in August in San Jose?

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

What is the driest month in San Jose?

June through August are months with the least rain when the rain falls for 0.4 days and typically aggregates up to 0.04" (1mm) of rain.

How many days does it rain in August in San Jose?

In August, in San Jose, the rain falls for 0.4 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

What is the average length of the day in August in San Jose?

The average day length in August is 13h and 33min.

What time are sunrise and sunset in August in San Jose?

In August, on the first day of the month, sunrise is at 6:12 am and sunset at 8:15 pm. On the last day of the month, in San Jose, California, sunrise is at 6:37 am and sunset at 7:38 pm PDT.

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

In August, the average sunshine duration is 12h.

What are the months with the highest UV index in San Jose?

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

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

In August, the average daily maximum UV index in San Jose is 6. A UV Index reading of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
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 33min

The month with the longest days is June (Average daylight: 14h and 41min).
The month with the shortest days is December (Average daylight: 9h and 38min).

  • 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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