San Clemente
California, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
San Clemente, CA

The last month of the summer, August, is another warm month in San Clemente, California, with temperature in the range of an average low of 63.5°F (17.5°C) and an average high of 77.2°F (25.1°C).

Temperature

In San Clemente, the average high-temperature in August is almost the same as in July - a still moderately hot 77.2°F (25.1°C). The average low-temperature, in August, is 63.5°F (17.5°C).

Humidity

The average relative humidity in San Clemente is 70%.

Rainfall

In San Clemente, during August, the rain falls for 2.8 days and regularly aggregates up to 0.2" (5mm) of precipitation. In San Clemente, during the entire year, the rain falls for 51.1 days and collects up to 3.66" (93mm) of precipitation.

Ocean temperature

August is the month with the warmest seawater in San Clemente, with an average ocean temperature of 68.2°F (20.1°C).
Note: For swimming, a surface water temperature of 68.2°F (20.1°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In San Clemente, the average length of the day in August is 13.3h.

Sunshine

July and August, with an average of 11.8h of sunshine, are months with the most sunshine in San Clemente, California.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
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. 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.

What is the temperature in August in San Clemente?

In San Clemente, in August, the average high-temperature is 77.2°F (25.1°C), and the average low-temperature is 63.5°F (17.5°C).

What is the average humidity in August in San Clemente?

In August, the average relative humidity in San Clemente, California, is 70%.

How many days does it rain in August in San Clemente?

In San Clemente, during August, the rain falls for 2.8 days and regularly aggregates up to 0.2" (5mm) of precipitation.

What is the month with the warmest ocean in San Clemente?

The month with the warmest seawater in San Clemente is August, with an average ocean temperature of 68.2°F (20.1°C).

What is the ocean temperature in August in San Clemente?

In San Clemente, the average seawater temperature in August is 68.2°F (20.1°C). For most, swimming in 68.2°F (20.1°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in August in San Clemente?

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

What is the month with the most sunshine in San Clemente?

July and August, with an average of 11.8h of sunshine, are months with the most sunshine in San Clemente, California.

How long on average sun shines in August in San Clemente?

The average sunshine in August is 11.8h.

What is the month with the highest UV index in San Clemente?

July through September, with an average maximum UV index of 6, are months with the highest UV index in San Clemente, California.

How high is the UV index in August in San Clemente?

The average daily maximum UV index in August in San Clemente is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays.
Average temperature in August - San Clemente, CA
  • Average high temperature in August: 77.2°F

The warmest month (with the highest average high temperature) is September (77.4°F).
The month with the lowest average high temperature is December (62.6°F).

  • Average low temperature in August: 63.5°F

Months with the highest average low temperature are August and September (63.5°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

Average humidity in August - San Clemente, CA
  • Average humidity in August: 70%

The month with the highest relative humidity is June (75%).
The month with the lowest relative humidity is November (60%).

Average rainfall in August - San Clemente, CA
  • Average rainfall in August: 0.2"

The wettest month (with the highest rainfall) is December (0.71").
The driest month (with the lowest rainfall) is June (0.08").

Average rainfall days in August - San Clemente, CA
  • Average rainfall days in August: 2.8 days

The month with the highest number of rainy days is March (7.3 days).
The month with the lowest number of rainy days is June (1.4 days).

Average sea temperature in August - San Clemente, CA
  • Average sea temperature in August: 68.3°F

The best month for swimming (with the highest average sea temperature) is August (68.3°F).
Coldest months (with the lowest average sea temperature) are January and February (58.9°F).

Average daylight in August / Average sunshine in August - San Clemente, CA
  • Average daylight in August: 13.3h

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

  • Average sunshine in August: 11.8h

Months with most sunshine are July and August (Average sunshine: 11.8h).
The month with least sunshine is December (Average sunshine: 6.5h).

Average UV index in August - San Clemente, CA
  • Average UV index in August: 6

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