August weather forecast and climate
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 also a moderately hot month, with average temperature varying between 81.9°F (27.7°C) and 56.5°F (13.6°C).

Temperature

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

Heat index

The average heat index is calculated to 84.6°F (29.2°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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', 'apparent temperature', 'real feel', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 is 62%.

Rainfall

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 San Jose, the average length of the day in August is 13.5h.

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 threat to health from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the 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.
[Resources]

FAQ

What is the temperature in August in San Jose?

The average high-temperature, in August, in San Jose, California, is 81.9°F (27.7°C), while the average low-temperature is 56.5°F (13.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is calculated to 84.6°F (29.2°C).

What is the average humidity in August in San Jose?

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

How much does it rain in San Jose in August?

In San Jose, California, in August, during 0.4 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the driest month in San Jose?

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

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

The average length of the day in August in San Jose is 13.5h.

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

The average sunshine in August is 12h.

What is the month with the highest UV index in San Jose?

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?

In August, the average daily maximum UV index in San Jose, California, is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

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).

[Resources]

Average pressure in August
San Jose, CA

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

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

[Resources]

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).

[Resources]

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%).
Months with the lowest relative humidity are July and September (60%).

[Resources]

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").

[Resources]

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).

[Resources]

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: 13.5h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in August: 12h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

[Resources]

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).

[Resources]

Average UV index in August
San Jose, CA

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

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

[Resources]

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).

[Resources]

Average visibility in August
San Jose, CA

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

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

[Resources]