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August Weather in San Diego, United States

Last updated: June 24, 2025

In San Diego, United States, the average temperature in August hovers around 30°C (87°F), with a minimum of 22°C (71°F) and a maximum peaking at a sweltering 40°C (105°F). Expect 52 mm (2.1 in) of precipitation across 8 days, while the average humidity settles at a comfortable 65%. Be prepared for warm and humid days!

August Temperature in San Diego

In August in San Diego, the average temperature is 30°C (87°F). Maximums can reach 40°C (105°F) and minimums can be as low as 22°C (71°F). This warm climate makes San Diego an ideal destination for sun-seekers and outdoor enthusiasts.

August Weather in San Diego: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, August typically has an average temperature of 30°C (87°F), with highs reaching up to 40°C (105°F) and lows dropping to around 22°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec586169748184858682756661
Data source: Temperature data for San Diego generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in San Diego

In San Diego in August, the total precipitation amount is 52 mm (2.1 in) over the course of 8 days.

August Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In San Diego, August typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec2724544199887952104443738
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Diego

In San Diego in August, humidity is 65%. With an average temperature of 30°C (87°F), this humidity feels like a warm blanket, wrapping around you as you step outside, making travel feel sticky and heavy but also invigorating, inviting you to seek out cool breezes and refreshing drinks.

August Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in San Diego is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Diego

In San Diego in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Diego.

Maximum UV Index Levels in San Diego for August

The chart shows the monthly maximum UV Index (UVI) for San Diego in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in San Diego typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111112121211975
Data source: San Diego August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in San Diego Compares to Other Months

Weather in San Diego varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in San Diego, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Diego, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (58°F)27 mm (1.1 inches)83%high
February Weather16°C (61°F)24 mm (1.0 inches)79%very high
March Weather21°C (69°F)54 mm (2.1 inches)76%very high
April Weather24°C (75°F)41 mm (1.6 inches)77%extreme
May Weather27°C (81°F)99 mm (3.9 inches)80%extreme
June Weather29°C (84°F)88 mm (3.4 inches)73%extreme
July Weather30°C (86°F)79 mm (3.1 inches)66%extreme
August Weather30°C (87°F)52 mm (2.1 inches)65%extreme
September Weather28°C (82°F)104 mm (4.1 inches)73%extreme
October Weather24°C (76°F)44 mm (1.7 inches)76%very high
November Weather19°C (66°F)37 mm (1.4 inches)80%high
December Weather16°C (61°F)38 mm (1.5 inches)86%moderate

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