August weather forecast and climate
Modesto, CA

Weather in August

August, the last month of the summer, in Modesto, is also a sweltering month, with average temperature ranging between min 61.7°F (16.5°C) and max 96.4°F (35.8°C).

Temperature

In Modesto, the average high-temperature in August is essentially the same as in July - a still very hot 96.4°F (35.8°C). In August, in Modesto, the average low-temperature is 61.7°F (16.5°C).

Heat index

The average heat index is calculated to a very hot 101.7°F (38.7°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like pregnancy, differences in body mass, height, and shape, metabolic differences, and activity influence one's weather impression. 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Modesto, the average relative humidity is 40%.

Rainfall

July and August are months with the least rain when the rain falls for 0.9 days and typically aggregates up to 0.04" (1mm) of rain.

Daylight

The average length of the day in Modesto, California, is 13.6h.

Sunshine

In Modesto, California, the average sunshine is 12h.

UV index

June through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Modesto?

In August, in Modesto, the average high-temperature is 96.4°F (35.8°C), and the average low-temperature is 61.7°F (16.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that combines air temperature and relative humidity, in August is estimated at 101.7°F (38.7°C).

What is the average humidity in August in Modesto?

The average relative humidity in August in Modesto is 40%.

How many days does it rain in August in Modesto?

In August, in Modesto, the rain falls for 0.9 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

What is the driest month in Modesto?

Months with the least rainfall in Modesto are July and August Rain falls for 0.9 days and accumulates 0.04" (1mm) of rain.

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

In Modesto, California, the average length of the day in August is 13.6h.

How many hours of sunshine does Modesto have in August?

In Modesto, California, the average sunshine in August is 12h.

When is the highest UV index in Modesto?

Months with the highest UV index in Modesto, California, are June through August, with an average maximum UV index of 7.

How high is the UV index in August in Modesto?

The average daily maximum UV index in August in Modesto is 7. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to the Sun's UV rays.

Average temperature in August
Modesto, CA

Average temperature in August - Modesto, CA
  • Average high temperature in August: 96.4°F

The warmest month (with the highest average high temperature) is July (97.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in August: 61.7°F

The month with the highest average low temperature is July (62.1°F).
The coldest months (with the lowest average low temperature) are January and December (41.9°F).

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Average pressure in August
Modesto, CA

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

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in August
Modesto, CA

Average wind speed in August - Modesto, CA
  • Average wind speed in August: 6.5mph

The windiest month (with the highest average wind speed) is June (7.3mph).
The calmest month (with the lowest average wind speed) is November (5.2mph).

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Average humidity in August
Modesto, CA

Average humidity in August - Modesto, CA
  • Average humidity in August: 40%

The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in August
Modesto, CA

Average rainfall in August - Modesto, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is March (1.3").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in August
Modesto, CA

Average rainfall days in August - Modesto, CA
  • Average rainfall days in August: 0.9 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in August / Average sunshine in August - Modesto, CA
  • Average daylight in August: 13.6h

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).

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Average sunshine days in August
Modesto, CA

Average sunshine days in August - Modesto, CA
  • Average sunshine days in August: 29.2 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (19.6 days).

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Average UV index in August
Modesto, CA

Average UV index in August - Modesto, CA
  • Average UV index in August: 7

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in August
Modesto, CA

Average cloud cover in August - Modesto, CA
  • Average cloud cover in August: 5

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in August
Modesto, CA

Average visibility in August - Modesto, 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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