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August Forecast – West Coast

Daily high temperatures are around 84°F, rarely falling below 78°F or exceeding 93°F. The highest daily average high temperature is 85°F on August 26.

Daily low temperatures are around 66°F, rarely falling below 61°F or exceeding 71°F. The highest daily average low temperature is 66°F on August 25.

For reference, on August 25, the hottest day of the year, temperatures in Los Angeles typically range from 66°F to 85°F, while on December 25, the coldest day of the year, they range from 48°F to 67°F.


The month of August in Los Angeles experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 10% throughout the month.

The clearest day of the month is August 23, with clear, mostly clear, or partly cloudy conditions 90% of the time.

For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Los Angeles, the chance of a wet day over the course of August is essentially constant, remaining around 1% throughout.

For reference, the year’s highest daily chance of a wet day is 21% on February 20, and its lowest chance is 0% on July 17.


To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in Los Angeles is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches.


Over the course of August in Los Angeles, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 55 minutes, implying an average daily decrease of 1 minute, 51 seconds, and weekly decrease of 12 minutes, 56 seconds.

The shortest day of the month is August 31, with 12 hours, 53 minutes of daylight and the longest day is August 1, with 13 hours, 49 minutes of daylight.

The earliest sunrise of the month in Los Angeles is 6:04 AM on August 1 and the latest sunrise is 21 minutes later at 6:26 AM on August 31.

The latest sunset is 7:53 PM on August 1 and the earliest sunset is 34 minutes earlier at 7:19 PM on August 31.

Daylight saving time is observed in Los Angeles during 2021, but it neither starts nor ends during August, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:42 AM and sets 14 hours, 26 minutes later, at 8:07 PM, while on December 21, the shortest day of the year, it rises at 6:54 AM and sets 9 hours, 53 minutes later, at 4:47 PM.


We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Los Angeles is essentially constant during August, remaining within 1% of 6% throughout.

The highest chance of a muggy day during August is 7% on August 4.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 7% of the time, while on November 10, the least muggy day of the year, there are muggy conditions 0% of the time.


DatesWeather Conditions
Aug 1-3Sunny, cool
Aug 4-12A few showers; cold inland, warm coast
Aug 13-20Isolated showers; cool inland, warm coast
Aug 21-26Sunny, warm
Aug 27-31Scattered showers; cool north, warm south
Augusttemperature 70° (1° below avg.)
precipitation 0.35″ (0.5″ above avg. north, avg. south)