August weather forecast and climate
San Clemente, CA

Weather in August

August, the last month of the summer, in San Clemente, is also a moderately hot month, with average temperature varying between 63.5°F (17.5°C) and 77.2°F (25.1°C).

Temperature

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

Humidity

The average relative humidity in San Clemente is 70%.

Rainfall

In August, in San Clemente, California, the rain falls for 2.8 days. Throughout August, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in San Clemente, there are 51.1 rainfall days, and 3.66" (93mm) of precipitation is accumulated.

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

Sunshine

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

UV index

Months with the highest UV index are July through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in August in San Clemente?

In August, the average relative humidity is 70%.

How much does it rain in San Clemente in August?

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

When is the ocean warmest in San Clemente?

August is the month with the warmest seawater, 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 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).

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

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

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

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

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

In San Clemente, California, the average sunshine in August is 11.8h.

When is 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.

What is the UV index reading in August in San Clemente?

In August, the average daily maximum UV index in San Clemente, California, is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in August
San Clemente, CA

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).

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Average pressure in August
San Clemente, CA

Average pressure in August - San Clemente, CA
  • Average pressure in August: 29.89"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
San Clemente, CA

Average wind speed in August - San Clemente, CA
  • Average wind speed in August: 4.9mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (4.9mph).

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Average humidity in August
San Clemente, CA

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%).

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Average rainfall in August
San Clemente, CA

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 least rainfall) is June (0.08").

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Average rainfall days in August
San Clemente, CA

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 least rainy days is June (1.4 days).

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Average sea temperature in August
San Clemente, CA

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).
The coldest months (with the lowest average sea temperature) are January and February (58.9°F).

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Average daylight in August /
Average sunshine in August
San Clemente, CA

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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in August: 11.8h

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

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Average sunshine days in August
San Clemente, CA

Average sunshine days in August - San Clemente, CA
  • Average sunshine days in August: 25.3 days

The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (21.6 days).

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Average UV index in August
San Clemente, CA

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).

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Average cloud cover in August
San Clemente, CA

Average cloud cover in August - San Clemente, CA
  • Average cloud cover in August: 11

Months with the most cloud cover are March and May (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 11).

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Average visibility in August
San Clemente, CA

Average visibility in August - San Clemente, 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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