August weather forecast
Pasadena, CA

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Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky
Pasadena City Hall in California, with neon-lit paths and natural gardens, under a perfect blue night sky

Weather in August

August in Pasadena sees a further rise in the temperature, continuing the summer trend with 87.1°F (30.6°C) being the highest temperature of the month. The prevailing warm climate and extended daylight hours offer an optimal environment for outdoor enthusiasts and nature lovers. From strolls in the park, picnics under clear skies, or simply basking in the sun, this weather encourages a dynamic lifestyle. While August retains the summer heat, the wind speed sees a slight decline, adding to the heat's intensity. Sunscreen and hats become daily essentials during the long, hot August days.

Temperature

Pasadena's temperatures tend to reach their peak averages in August, with a high of 87.1°F (30.6°C) and a low of 64.9°F (18.3°C).

Heat index

The heat index for August is calculated to be a hot 89.6°F (32°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.

Humidity

The average relative humidity in August is 49%.

Rainfall

In August, in Pasadena, the rain falls for 1.5 days. Throughout August, 0.12" (3mm) of precipitation is accumulated. In Pasadena, during the entire year, the rain falls for 50.1 days and collects up to 8.5" (216mm) of precipitation.

Daylight

In Pasadena, the average length of the day in August is 13h and 23min.
On the first day of August in Pasadena, sunrise is at 6:04 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:19 pm PDT.

Sunshine

The average sunshine in August in Pasadena is 12h.

UV index

The months with the highest UV index in Pasadena 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 exposure to the Sun's UV rays for the average person.
Note: In August, a daily maximum UV index of 6 leads to the following instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

What time of the year is the hottest in Pasadena?

August, with its high-temperature average of 87.1°F (30.6°C) and a low-temperature average of 64.9°F (18.3°C), is the warmest month in Pasadena.

How hot is it in Pasadena in August?

The average high-temperature and low-temperature in Pasadena, California, during August are 87.1°F (30.6°C) and 64.9°F (18.3°C) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is calculated to be 89.6°F (32°C).

What is the average humidity in August in Pasadena?

The average relative humidity in August is 49%.

How much does it rain in Pasadena in August?

In Pasadena, California, in August, it is raining for 1.5 days, with typically 0.12" (3mm) of accumulated precipitation.

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

In Pasadena, the average day length in August is 13h and 23min.

When are sunrise and sunset in August in Pasadena?

On the first day of August in Pasadena, California, sunrise is at 6:04 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:19 pm PDT.

How long on average sun shines in August in Pasadena?

The average sunshine duration in August in Pasadena, California, is 12h.

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

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

How high is the UV index in August in Pasadena?

The average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Pasadena, CA

Average temperature in August - Pasadena, CA
  • Average high temperature in August: 87.1°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in August: 64.9°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46.6°F).

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Average pressure in August
Pasadena, CA

Average pressure in August - Pasadena, CA
  • Average pressure in August: 29.89"Hg

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

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Average wind speed in August
Pasadena, CA

Average wind speed in August - Pasadena, CA
  • Average wind speed in August: 4.5mph

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
Pasadena, CA

Average humidity in August - Pasadena, CA
  • Average humidity in August: 49%

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in August
Pasadena, CA

Average rainfall in August - Pasadena, CA
  • Average rainfall in August: 0.12"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Pasadena, CA

Average rainfall days in August - Pasadena, CA
  • Average rainfall days in August: 1.5 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.1 days).

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

Average daylight in August / Average sunshine in August - Pasadena, CA
  • Average daylight in August: 13h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in August: 12h and 0min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).

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Average sunshine days in August
Pasadena, CA

Average sunshine days in August - Pasadena, CA
  • Average sunshine days in August: 27.2 days

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in August
Pasadena, CA

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

The 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
Pasadena, CA

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

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in August
Pasadena, CA

Average visibility in August - Pasadena, CA
  • Average visibility in August: 6mi

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

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Pasadena, California, USA

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