August weather forecast and climate
Fullerton, CA

Trees and neat lawns of the famous Muckenthaler Community Center in Fullerton, California
Trees and neat lawns of the famous Muckenthaler Community Center in Fullerton, California

Weather in August

The last month of the summer, August, is also a moderately hot month in Fullerton, California, with average temperature ranging between max 83.5°F (28.6°C) and min 65.5°F (18.6°C).

Temperature

The warmest month is August, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 65.5°F (18.6°C).

Heat index

The average heat index is evaluated at a tropical 86.4°F (30.2°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. 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 subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, differences in body mass, height, and shape). 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. 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.

Humidity

In August, the average relative humidity is 59%.

Rainfall

In Fullerton, California, during 2.2 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 52.5 rainfall days, and 7.09" (180mm) of precipitation is accumulated.

Daylight

In Fullerton, the average length of the day is 13.4h.

Sunshine

Months with the most sunshine are July and August, with an average of 12h of sunshine.

UV index

June through September, 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 unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in Fullerton?

August is the warmest month, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 65.5°F (18.6°C).

What is the temperature in August in Fullerton?

In August, the average high-temperature is 83.5°F (28.6°C), and the average low-temperature is 65.5°F (18.6°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, is appraised at 86.4°F (30.2°C).

What is the average humidity in August in Fullerton?

In Fullerton, California, the average relative humidity in August is 59%.

How much does it rain in Fullerton in August?

In Fullerton, in August, during 2.2 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How many hours of daylight does Fullerton have in August?

In August, the average length of the day in Fullerton is 13.4h.

What are the months with the most sunshine in Fullerton?

Months with the most sunshine in Fullerton, California, are July and August, with an average of 12h of sunshine.

How many hours of sunshine does Fullerton have in August?

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

When is the highest UV index in Fullerton?

Months with the highest UV index in Fullerton, California, are June through September, with an average maximum UV index of 6.

What is the UV index reading in August in Fullerton?

The average daily maximum UV index in August in Fullerton, California, is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in August
Fullerton, CA

Average temperature in August - Fullerton, CA
  • Average high temperature in August: 83.5°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (64°F).

  • Average low temperature in August: 65.5°F

The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in August
Fullerton, CA

Average pressure in August - Fullerton, CA
  • Average pressure in August: 29.89"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
Fullerton, CA

Average wind speed in August - Fullerton, CA
  • Average wind speed in August: 4.8mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).

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Average humidity in August
Fullerton, CA

Average humidity in August - Fullerton, CA
  • Average humidity in August: 59%

The month with the highest relative humidity is June (65%).
The month with the lowest relative humidity is November (51%).

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Average rainfall in August
Fullerton, CA

Average rainfall in August - Fullerton, CA
  • Average rainfall in August: 0.2"

The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Fullerton, CA

Average rainfall days in August - Fullerton, CA
  • Average rainfall days in August: 2.2 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.5 days).

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

Average daylight in August / Average sunshine in August - Fullerton, CA
  • Average daylight in August: 13.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in August: 12h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in August
Fullerton, CA

Average sunshine days in August - Fullerton, CA
  • Average sunshine days in August: 25.8 days

The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20.6 days).

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Average UV index in August
Fullerton, CA

Average UV index in August - Fullerton, CA
  • Average UV index in August: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in August
Fullerton, CA

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

Months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in August
Fullerton, CA

Average visibility in August - Fullerton, 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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