August weather forecast and climate
Gilroy, CA

A colorful sunset sky over the hilly region of Gilroy in California
A colorful sunset sky over the hilly region of Gilroy in California

Weather in August

The last month of the summer, August, is also a moderately hot month in Gilroy, California, with temperature in the range of an average low of 54.1°F (12.3°C) and an average high of 85.1°F (29.5°C).

Temperature

August is the warmest month, with an average high-temperature of 85.1°F (29.5°C) and an average low-temperature of 54.1°F (12.3°C).

Heat index

The average heat index is appraised at a hot 89.4°F (31.9°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, wind), 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 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 is 60%.

Rainfall

In Gilroy, California, rain does not fall in June through August.

Daylight

In August, the average length of the day in Gilroy is 13.5h.

Sunshine

In Gilroy, the average sunshine 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 estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in Gilroy?

August is the warmest month in Gilroy, with an average high-temperature of 85.1°F (29.5°C) and an average low-temperature of 54.1°F (12.3°C).

What is the temperature in August in Gilroy?

In August, in Gilroy, California, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 54.1°F (12.3°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, in August is appraised at 89.4°F (31.9°C).

What is the average humidity in August in Gilroy?

In August, the average relative humidity in Gilroy, California, is 60%.

Does it rain in Gilroy in August?

In Gilroy, California, in August, it doesn't rain. In September, it rains.

What is the driest month in Gilroy?

In Gilroy rain does not fall in June through August.

What is the average length of the day in August in Gilroy?

In August, the average length of the day in Gilroy is 13.5h.

How long on average sun shines in August in Gilroy?

In Gilroy, the average sunshine in August is 12h.

What is the month with the highest UV index in Gilroy?

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

What is the UV index reading in August in Gilroy?

The average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in August
Gilroy, CA

Average temperature in August - Gilroy, CA
  • Average high temperature in August: 85.1°F

The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (57.6°F).

  • Average low temperature in August: 54.1°F

Months with the highest average low temperature are August and September (54.1°F).
The coldest months (with the lowest average low temperature) are February and March (40.6°F).

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Average pressure in August
Gilroy, CA

Average pressure in August - Gilroy, CA
  • Average pressure in August: 29.92"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in August
Gilroy, CA

Average wind speed in August - Gilroy, CA
  • Average wind speed in August: 4.3mph

The windiest month (with the highest average wind speed) is May (5.3mph).
The calmest month (with the lowest average wind speed) is November (3.9mph).

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Average humidity in August
Gilroy, CA

Average humidity in August - Gilroy, CA
  • Average humidity in August: 60%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (57%).

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Average rainfall in August
Gilroy, CA

Average rainfall in August - Gilroy, CA
  • Average rainfall in August: 0"

The wettest month (with the highest rainfall) is December (0.83").
The driest months (with the least rainfall) are June, July and August (0").

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Average rainfall days in August
Gilroy, CA

Average rainfall days in August - Gilroy, CA
  • Average rainfall days in August: 0.6 days

The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is August (0.6 days).

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Average daylight in August /
Average sunshine in August
Gilroy, CA

Average daylight in August / Average sunshine in August - Gilroy, 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: 9.7h).

  • 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).

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Average sunshine days in August
Gilroy, CA

Average sunshine days in August - Gilroy, CA
  • Average sunshine days in August: 29.7 days

The month with the most sunshine days is July (29.9 days).
The month with the least sunshine days is March (21.4 days).

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Average UV index in August
Gilroy, CA

Average UV index in August - Gilroy, 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).

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Average cloud cover in August
Gilroy, CA

Average cloud cover in August - Gilroy, CA
  • Average cloud cover in August: 8

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in August
Gilroy, CA

Average visibility in August - Gilroy, 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).

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