August weather forecast and climate
Altadena, CA

Weather in August

August, the last month of the summer, in Altadena, is a tropical month, with average temperature varying between 64.4°F (18°C) and 86.2°F (30.1°C).

Temperature

With an average high-temperature of 86.2°F (30.1°C) and an average low-temperature of 64.4°F (18°C), August is the warmest month.

Heat index

The average heat index is appraised at a tropical 87.6°F (30.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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 'real feel', 'felt air temperature', 'apparent temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, pregnancy, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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.

Humidity

In Altadena, the average relative humidity in August is 48%.

Rainfall

In August, the rain falls for 2.3 days. Throughout August, 0.16" (4mm) of precipitation is accumulated. In Altadena, California, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.

Daylight

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

Sunshine

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

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation 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. 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 warmest month in Altadena?

The warmest month in Altadena is August, with an average high-temperature of 86.2°F (30.1°C) and an average low-temperature of 64.4°F (18°C).

What is the temperature in August in Altadena?

In August, in Altadena, California, the average high-temperature is 86.2°F (30.1°C), and the average low-temperature is 64.4°F (18°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, is calculated to 87.6°F (30.9°C).

What is the average humidity in August in Altadena?

In August, the average relative humidity in Altadena is 48%.

How much does it rain in Altadena in August?

In Altadena, in August, during 2.3 rainfall days, 0.16" (4mm) of precipitation is typically accumulated.

How many hours of daylight does Altadena have in August?

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

How long on average sun shines in August in Altadena?

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

What are the months with the highest UV index in Altadena?

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

What is the UV index intensity in August in Altadena?

In August, the average daily maximum UV index in Altadena, California, is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in August
Altadena, CA

Average temperature in August - Altadena, CA
  • Average high temperature in August: 86.2°F

The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (61°F).

  • Average low temperature in August: 64.4°F

The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in August
Altadena, CA

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

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
Altadena, CA

Average wind speed in August - Altadena, CA
  • Average wind speed in August: 4.6mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in August
Altadena, CA

Average humidity in August - Altadena, CA
  • Average humidity in August: 48%

Months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).

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Average rainfall in August
Altadena, CA

Average rainfall in August - Altadena, CA
  • Average rainfall in August: 0.16"

The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Altadena, CA

Average rainfall days in August - Altadena, CA
  • Average rainfall days in August: 2.3 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).

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

Average daylight in August / Average sunshine in August - Altadena, 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 June and July (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.9).

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Average sunshine days in August
Altadena, CA

Average sunshine days in August - Altadena, CA
  • Average sunshine days in August: 26.2 days

The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.3 days).

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Average UV index in August
Altadena, CA

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

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in August
Altadena, CA

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

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

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Average visibility in August
Altadena, CA

Average visibility in August - Altadena, 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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