August weather forecast
San Clemente, CA

Share

Weather in August

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

Temperature

In the transition from July to August, San Clemente reports an average high-temperature of a still moderately hot 77.2°F (25.1°C), indicating a close resemblance to the prior month. During the month of August, an average low-temperature of 63.5°F (17.5°C) is recorded.

Humidity

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

Rainfall

In San Clemente, in August, during 2.8 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. 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

With an average ocean temperature of 68.2°F (20.1°C), August is the month with the warmest seawater.
Note: Swimming in 68.2°F (20.1°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).

Daylight

In San Clemente, the average length of the day in August is 13h and 21min.
On the first day of August, sunrise is at 6:03 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 7:16 pm PDT.

Sunshine

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

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 threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index of 6 during August translates into these guidelines:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Jul 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for San Clemente in August?

The high-temperature, in August, in San Clemente, records 77.2°F (25.1°C), while the low-temperature is 63.5°F (17.5°C).

What is the average humidity in August?

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

How many days does it rain in August?

In San Clemente, in August, it is raining for 2.8 days, with typically 0.2" (5mm) of accumulated precipitation.

What is the month with the warmest ocean?

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 August, the average water temperature is 68.2°F (20.1°C). Swimming in 68.2°F (20.1°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does San Clemente have in August?

In San Clemente, the average day length in August is 13h and 21min.

When is the sunrise / sunset in August?

In August, on the first day of the month, sunrise is at 6:03 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 7:16 pm PDT.

What is the month with the most sunshine?

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

How many hours of sunshine does San Clemente have in August?

In August, the average sunshine duration is 11.8h.

What are the months with the highest UV index?

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

How high is the UV index in August?

In August, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe 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
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

The 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 pressure in August
San Clemente, CA

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

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

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).

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%).

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").

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).

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).

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: 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: 11h and 5min

The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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).

Average UV index in August
San Clemente, CA

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

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

Average cloud cover in August
San Clemente, CA

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

The 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).

Average visibility in August
San Clemente, CA

Average visibility in August - San Clemente, 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).

San Clemente, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location