August weather forecast and climate
La Mesa, CA

Weather in August

August, the last month of the summer, in La Mesa, is another warm month, with average temperature fluctuating between 65.8°F (18.8°C) and 82.6°F (28.1°C).

Temperature

With an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 65.8°F (18.8°C), August is the warmest month.

Heat index

In August, the average heat index is evaluated at 85.6°F (29.8°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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', 'felt air temperature', 'real feel', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, wind). 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 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 62%.

Rainfall

In La Mesa, during August, the rain falls for 2.8 days and regularly aggregates up to 0.28" (7mm) of precipitation. Throughout the year, there are 54.5 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

Daylight

The average length of the day in August is 13.3h.

Sunshine

In La Mesa, the average sunshine is 11.9h.

UV index

Months with the highest UV index in La Mesa are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the warmest month in La Mesa?

The warmest month in La Mesa, California, is August, with an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 65.8°F (18.8°C).

What is the temperature in August in La Mesa?

The average high-temperature, in August, in La Mesa, is 82.6°F (28.1°C), while the average low-temperature is 65.8°F (18.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, is appraised at 85.6°F (29.8°C).

What is the average humidity in August in La Mesa?

The average relative humidity in August in La Mesa, California, is 62%.

How much does it rain in La Mesa in August?

In La Mesa, in August, during 2.8 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

What is the average length of the day in August in La Mesa?

In August, the average length of the day in La Mesa is 13.3h.

How many hours of sunshine does La Mesa have in August?

The average sunshine in August in La Mesa, California, is 11.9h.

When is the highest UV index in La Mesa?

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

What is the UV index reading in August in La Mesa?

In August, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation.

Average temperature in August
La Mesa, CA

Average temperature in August - La Mesa, CA
  • Average high temperature in August: 82.6°F

The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (64.2°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 February (48.7°F).

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Average pressure in August
La Mesa, CA

Average pressure in August - La Mesa, CA
  • Average pressure in August: 29.88"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in August
La Mesa, CA

Average wind speed in August - La Mesa, CA
  • Average wind speed in August: 4.7mph

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).

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Average humidity in August
La Mesa, CA

Average humidity in August - La Mesa, CA
  • Average humidity in August: 62%

The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (55%).

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Average rainfall in August
La Mesa, CA

Average rainfall in August - La Mesa, CA
  • Average rainfall in August: 0.28"

The wettest month (with the highest rainfall) is February (1.3").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in August
La Mesa, CA

Average rainfall days in August - La Mesa, CA
  • Average rainfall days in August: 2.8 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in August /
Average sunshine in August
La Mesa, CA

Average daylight in August / Average sunshine in August - La Mesa, CA
  • Average daylight in August: 13.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in August: 11.9h

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

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Average sunshine days in August
La Mesa, CA

Average sunshine days in August - La Mesa, CA
  • Average sunshine days in August: 25.7 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21 days).

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Average UV index in August
La Mesa, CA

Average UV index in August - La Mesa, 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
La Mesa, CA

Average cloud cover in August - La Mesa, CA
  • Average cloud cover in August: 8

The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in August
La Mesa, CA

Average visibility in August - La Mesa, 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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