August Weather in San Diego, United States

Last updated: February 24, 2025

August in San Diego, United States is characterized by pleasantly warm weather, with maximum temperatures reaching up to 29°C (84°F) and an inviting average of 21°C (71°F). The nights bring refreshing cooler air, dropping to a minimum of 17°C (63°F). This month is particularly dry, recording only 1 mm of precipitation over zero rainy days, allowing for endless sunshine as locals and visitors alike enjoy outdoor activities. With a steady humidity level of 42%, the climate remains comfortable and appealing, making August an ideal time to experience the vibrant beauty of San Diego.

August Temperature in San Diego

In August, San Diego experiences a delightful embrace of summer warmth, with temperatures ranging from a mild 17°C (63°F) at night to a pleasant 29°C (84°F) during the day. The average temperature hovers around 21°C (71°F), creating an ideal backdrop for beach outings and outdoor activities. This warm pattern continues from the previous months, reflecting a steady rise in temperatures that peaks in both July and August. Notably, the minimum temperatures slightly increase compared to July, indicating the transition towards warmer days, while the maximum remains consistent, ensuring that the allure of summer is palpable. This blend of comfortably warm days and cool evenings makes August one of the finest months to bask in the sunshine and coastal charm of San Diego.

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.
JanFebMarAprMayJunJulAugSepOctNovDec575758616265697170686358
Data source: Temperature data for San Diego generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in San Diego

In August, San Diego experiences remarkably dry conditions, with precipitation measuring a mere 1 mm (0.0 in) and no recorded rainy days. This trend reflects the peak of summer in the region, where the city's Mediterranean climate brings an abundance of sunshine and minimal rainfall. Following a gradual decline from the wetter months of January through April, August's precipitation is among the lowest of the year, joining July in its drought-like status. As the summer heat intensifies, residents and visitors can expect clear skies and warm temperatures, setting the stage for leisurely outdoor activities. The subsequent months see a slight uptick in precipitation, signaling the transition towards the wetter autumn season.

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.
JanFebMarAprMayJunJulAugSepOctNovDec45553820162114132460
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in San Diego

In August, San Diego experiences its driest month, with humidity dropping to a refreshing 42%. This is a notable decline from the more humid winter months, like January at 72% and February at 77%, showcasing a trend towards drier conditions as summer progresses. Following the peak months of spring, where humidity levels hover around 46%, August stands out as the month when coastal breezes and increased temperatures combine to create a more comfortable atmosphere. As the season transitions into fall, humidity gently rises again in September to 52%, hinting at the return of the ocean's moisture. Overall, these fluctuations reflect San Diego's Mediterranean climate, characterized by warm, dry summers and a gradual increase in humidity as the year progresses.

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, allowing you to see how August's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Diego

In August, San Diego experiences a UV Index of 10, categorizing it as very high and demanding caution for sun lovers. As summer reaches its peak, the burn time decreases to just 15 minutes, emphasizing the need for protective measures. This month marks a slight dip from the intense extreme levels of 11 seen from May through July, but the sun's power remains formidable. With this trend of elevated UV levels throughout the summer months, it's essential to stay informed and prepared. For more details on sun safety, check out the San Diego UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
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.

August Sunshine in San Diego

In August, San Diego basks in a delightful 361 hours of sunshine, maintaining its status as a summer haven. This month follows the peak brightness of July, which boasted an impressive 376 hours. As the summer winds down, the sunshine hours begin to decline, yet August still enjoys a robust abundance of sun, laying the groundwork for the seamless transition into the milder yet still pleasant days of September with 318 hours. Overall, the trend reveals a steady accumulation of sunlight from the winter months, peaking in mid-summer, before gently tapering off as fall approaches, reflecting San Diego's reputation as a sun-soaked paradise throughout the year.

Monthly Sunshine Duration in San Diego: August Highlighted

The August sunshine duration represents the total number of hours San Diego experiences direct sunlight during the month of August, excluding cloudy or obstructed periods. This chart compares the sunshine duration of August with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec195h243h299h325h361h366h376h361h318h297h257h231h
Data source: San Diego August Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Diego During August

August in San Diego typically boasts a 60% chance of sunny weather, making it one of the more favorable months for sunshine. Following the sunnier months of June and July, which have 47% and 56% chances respectively, August maintains a stable level of sunshine while still slightly trailing behind the peak prevalence of sun observed in the earlier months and autumn. As summer transitions toward fall, the likelihood of sun subtly rises again in September (63%) and October (64%). Overall, August presents a delightful mid-summer opportunity to bask in the sun, aligning well with San Diego's reputation for pleasant weather.

Percentage of Sunny Days in August in San Diego

The chart illustrates the percentage of sunny days in San Diego throughout the year, with August highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often San Diego experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%63%50%42%47%56%60%63%64%63%47%
Data source: San Diego August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Diego in August

As August rolls into San Diego, the city's daylight duration stands at a generous 13 hours, reflecting a slight decrease from the sun-filled 14 hours of July. This transition marks the peak of summer, where longer days have been the norm since June. Following August, the days gradually shorten, with September bringing just 12 hours of daylight, signaling the approaching autumn. Throughout the year, San Diego showcases a rhythmic pattern in daylight duration, peaking in the summer months before tapering off towards winter. This consistent cycle not only enhances the region’s vibrant lifestyle but also allows residents and visitors alike to fully embrace the golden summer evenings before they give way to the cozier, shorter days of fall.

Average Daylight Hours in San Diego for August

The chart illustrates the variation in daylight duration in San Diego throughout the year, with August highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 15m11h 1m12h13h13h 50m14h 15m14h 1m13h 16m12h 19m11h 19m10h 27m10h 1m
Data source: San Diego daylight hours, calculated by summing the hours between sunrise and sunset for each day.

August Winds in San Diego

In August, San Diego experiences a steady average wind speed of 3.1 m/s (7 mph), maintaining the consistent breezy conditions seen throughout the summer months. This slight dip from July doesn't disrupt the charming coastal atmosphere, as the winds remain gentle yet refreshing. Interestingly, as we transition from the hotter days of summer to the cooler embrace of fall, the wind speeds show a tendency to drop in the coming months, with September carrying the same average but gradually declining towards the end of the year. Overall, San Diego's winds in August reflect a harmonious balance, ensuring that the city's vibrant outdoor lifestyle can thrive under a pleasant and invigorating breeze.

Average August Wind Speed in San Diego

The chart displays monthly wind speed patterns in San Diego, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.02.73.43.23.13.33.13.1 m/s3.12.82.43.2
Data source: San Diego August wind data, generated using information from the Copernicus Climate Change Service.

How August Weather in San Diego Compares to Other Months

The weather in San Diego changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in San Diego and find detailed weather information for every month.

In August, the weather is warm and dry, with temperatures averaging around 21°C (71°F) and reaching a maximum of 29°C (84°F), while enjoying very little precipitation—only 1 mm over the entire month. In contrast, January experiences cooler temperatures, with an average of 14°C (58°F) and highs of 25°C (77°F), along with significantly more rainfall, totaling 45 mm across approximately five wet days. Additionally, January's humidity sits at 72%, making it feel much more humid compared to the drier August, which has a humidity level of just 42%. For a detailed look at January weather patterns, you can check out San Diego weather in January.

When comparing the weather in August to that of February, it's clear that August is characterized by warmer temperatures and drier conditions. In August, temperatures range from a minimum of 17°C (63°F) to a maximum of 29°C (84°F), with an average of 21°C (71°F) and just 1 mm of precipitation over zero rainy days and a humidity level of 42%. Conversely, February experiences much cooler temperatures, ranging from a minimum of 7°C (45°F) to a maximum of 26°C (79°F), with an average temperature of 14°C (57°F). February is also significantly wetter, receiving 55 mm (2.2 in) of rain across six days and a higher humidity of 77%. For more detailed insights, you can check San Diego weather in February.

August weather in San Diego is characterized by warm temperatures, with a minimum of 17°C (63°F), an average of 21°C (71°F), and a maximum of 29°C (84°F). The month is dry, featuring only 1 mm of precipitation across no rainy days, and the humidity is relatively low at 42%. In contrast, March presents cooler conditions, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 26°C (80°F) and an average of 15°C (59°F). This month is significantly wetter, experiencing 38 mm of rainfall over approximately 8 days, alongside higher humidity levels at 67%. For more detailed insights on March weather, you can check out San Diego weather in March.

When comparing the weather in August and April, August typically boasts warmer temperatures, with averages ranging from a minimum of 17°C (63°F) to a maximum of 29°C (84°F), while April's averages are cooler, from a minimum of 11°C (53°F) to a maximum of 29°C (84°F). Precipitation in August is almost nonexistent, with only 1 mm recorded over 0 days, in stark contrast to April, which experiences approximately 20 mm of precipitation over 2 days. Additionally, humidity levels are lower in August at 42%, compared to a higher 56% in April, suggesting that August provides a drier and more comfortable atmosphere. For more detailed information, check out San Diego weather in April.

When comparing the weather in August and May, August stands out as a warmer month with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 29°C (84°F), while May has cooler averages with temperatures between 12°C (54°F) and 25°C (78°F). Precipitation is nearly nonexistent in August, recording just 1 mm (0.0 in) over the month, whereas May experiences more rainfall, with a total of 16 mm (0.6 in) spread across 4 days. Additionally, August has slightly lower humidity at 42%, compared to May's 46%. For more details on May weather, you can visit San Diego weather in May.

August generally offers warmer temperatures compared to June, with average lows of 17°C (63°F) in August compared to 14°C (58°F) in June. Both months can reach a maximum of 29°C (84°F), but August tends to be more consistently warm with an average temperature of 21°C (71°F), whereas June averages around 18°C (65°F). Precipitation is minimal in both months, with August receiving only 1 mm and June slightly higher at 2 mm, both having zero rainy days. Humidity is also lower in August at 42%, contrasted with June's 48%, making August feel a bit drier overall. For more details, you can check San Diego weather in June.

In comparing the weather of August and July, both months display similar temperature ranges, with August featuring a minimum of 17°C (63°F), an average of 21°C (71°F), and a maximum of 29°C (84°F), just a notch below July's 16°C (62°F) minimum, 21°C (69°F) average, and 29°C (85°F) maximum. Both months experience minimal precipitation, with August seeing just 1 mm (0.0 in) and July at 1 mm (0.1 in), and neither month recording any rainy days. However, August tends to be slightly less humid, with a humidity level of 42%, compared to July's 46%. For more detailed insights, check out San Diego weather in July.

In comparing the weather of August and September, we can observe some subtle differences. Both months share a similar minimum temperature of around 17°C (63°F) and an average temperature close to 21°C (71°F). However, September tends to be slightly warmer, with a maximum temperature reaching 31°C (88°F) compared to August's 29°C (84°F). Additionally, September experiences a marginal increase in humidity, rising to 52% from August's 42%. While both months receive minimal precipitation, September records a total of 3 mm, which is still quite low, especially since it has no days of rain. For more detailed information, you can check San Diego weather in September.

In comparing the weather between August and October, we see notable differences in temperature and humidity. August typically enjoys warmer temperatures, with a minimum of 17°C (63°F) and a maximum of 29°C (84°F), while October sees slightly cooler readings, with a minimum of 13°C (55°F) and a maximum of 32°C (90°F). Precipitation also increases in October, with a total of 13 mm (0.5 in) over 2 days, compared to virtually no precipitation in August. Additionally, October experiences higher humidity at 58%, compared to August’s 42%. For more details, check out San Diego weather in October.

August weather in San Diego is generally warm and dry, with temperatures ranging from a comfortable 17°C (63°F) at night to a high of 29°C (84°F) during the day. The humidity is relatively low at 42%, contributing to pleasant summer conditions, and there is virtually no precipitation. In contrast, November sees cooler temperatures, with a minimum of 10°C (51°F) and an average of 17°C (63°F), peaking at a maximum of 27°C (81°F). This month also experiences increased humidity at 66% and significantly more precipitation, accumulating to 24 mm (0.9 in) over two rainy days. For more detailed information, check this link: San Diego weather in November.

The weather in August is typically warm and dry, with temperatures ranging from a minimum of 17°C (63°F) to a pleasant maximum of 29°C (84°F), and only 1 mm of precipitation over the entire month. In contrast, December experiences cooler temperatures, with a minimum of 8°C (47°F) and a maximum of 24°C (76°F), while also bringing more moisture, totaling 60 mm of rainfall across about five days. Additionally, the humidity rises significantly in December to 74%, compared to the much drier 42% humidity in August. For more detailed insights, you can check San Diego weather in December.

Compare San Diego's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in San Diego

As August rolls into San Diego, visitors can expect warm and inviting weather that stands apart from the cooler months of the year. With plentiful sunshine and an average temperature around 21°C (71°F), this month offers the perfect backdrop for beach outings and outdoor adventures. Unlike the winter months when rain is more common, August boasts virtually no precipitation, allowing residents and tourists alike to enjoy every moment outdoors without the worry of interruptions from showers. The comfortable humidity levels of around 42% add to the pleasant experience, making it an ideal time to immerse yourself in the vibrant local culture. For more detailed insights, explore San Diego Climate.