August weather forecast
El Cajon, CA

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Weather in August

August remains a prime summer month in El Cajon, with little alteration in the prevailing weather patterns. While the heat continues, the city experiences a negligible uptick in average temperature. Days remain sunny and long, encouraging both residents and tourists to explore the city's outdoor attractions. With cloud coverage remaining low, the vista of bright blue skies becomes a common spectacle. The maximum temperature for August stays consistent around 83.8°F (28.8°C), marking it as the month with the highest overall temperature while maintaining a warm nighttime low of 65.8°F (18.8°C).

Temperature

August is the month when El Cajon sees the highest average temperatures, with a high of 83.8°F (28.8°C) and a low of 65.8°F (18.8°C).

Heat index

August's heat index is calculated to be a hot 87.8°F (31°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.
Bear in mind that the heat index values are determined for shaded areas and light breezes. With 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' or 'feels like', quantifies the warmth felt when relative humidity is considered. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in August is 60%.

Rainfall

In El Cajon, in August, it is raining for 3.3 days, with typically 0.31" (8mm) of accumulated precipitation. In El Cajon, during the entire year, the rain falls for 56.1 days and collects up to 8.27" (210mm) of precipitation.

Daylight

In El Cajon, the average length of the day in August is 13h and 19min.
On the first day of the month, sunrise is at 6:02 am and sunset at 7:46 pm. On the last day of August, sunrise is at 6:22 am and sunset at 7:13 pm PDT.

Sunshine

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

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in El Cajon. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: In August, the maximum UV index of 6 suggests this advice:
Elude overexposure. Fair-skinned people could get burnt 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-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
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Frequently asked questions

What are the warmest months in El Cajon?

In El Cajon, August records the average highest temperatures, peaking at 83.8°F (28.8°C) and reaching a low of 65.8°F (18.8°C).

How hot is it in El Cajon in August?

In El Cajon, in August, the average high-temperature is 83.8°F (28.8°C), and the average low-temperature is 65.8°F (18.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 87.8°F (31°C).

What is the average humidity in August in El Cajon?

In El Cajon, the average relative humidity in August is 60%.

How much does it rain in El Cajon in August?

In El Cajon, during August, the rain falls for 3.3 days and regularly aggregates up to 0.31" (8mm) of precipitation.

What is the average length of the day in August in El Cajon?

In August, the average day length in El Cajon, California, is 13h and 19min.

What time are sunrise and sunset in August in El Cajon?

On the first day of August, sunrise is at 6:02 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:13 pm PDT.

How long on average sun shines in August in El Cajon?

In El Cajon, the average sunshine duration in August is 12h.

When is the highest UV index in El Cajon?

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

What is the UV index reading in August in El Cajon?

In August, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk 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
El Cajon, CA

Average temperature in August - El Cajon, CA
  • Average high temperature in August: 83.8°F

The warmest month (with the highest average high temperature) is August (83.8°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in August: 65.8°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (47.8°F).

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Average pressure in August
El Cajon, CA

Average pressure in August - El Cajon, CA
  • Average pressure in August: 29.88"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.87"Hg).

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Average wind speed in August
El Cajon, CA

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

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is October (4.3mph).

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Average humidity in August
El Cajon, CA

Average humidity in August - El Cajon, CA
  • Average humidity in August: 60%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (53%).

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Average rainfall in August
El Cajon, CA

Average rainfall in August - El Cajon, CA
  • Average rainfall in August: 0.31"

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
El Cajon, CA

Average rainfall days in August - El Cajon, CA
  • Average rainfall days in August: 3.3 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in August /
Average sunshine in August
El Cajon, CA

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in August: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in August
El Cajon, CA

Average sunshine days in August - El Cajon, CA
  • Average sunshine days in August: 23.9 days

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (21.9 days).

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Average UV index in August
El Cajon, CA

Average UV index in August - El Cajon, CA
  • Average UV index in August: 6

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

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Average cloud cover in August
El Cajon, CA

Average cloud cover in August - El Cajon, CA
  • Average cloud cover in August: 7

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in August
El Cajon, CA

Average visibility in August - El Cajon, 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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El Cajon, California, USA

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