Last updated: February 24, 2025
In August, San Antonio experiences sizzling temperatures, with maximums soaring up to 40°C (103°F) and a comfortable average of 30°C (86°F). Nights offer a mild reprieve, as temperatures dip to a minimum of 20°C (69°F). This month also brings a touch of moisture, with 56 mm (2.2 in) of precipitation spread across 6 days. Relative humidity hovers around 58%, adding a bit of stickiness to the summer heat. Whether you're sipping a cold drink or enjoying the vibrant outdoor scene, August in San Antonio is a lively blend of sunshine and occasional rain.
In August, San Antonio reaches the peak of summer with temperatures that reflect the sweltering heat of the season. The average daily temperature soars to 30°C (86°F), complemented by minimums of 20°C (69°F) and maximums that can climb to a blistering 40°C (103°F). This month marks a slight increase in both the average and high temperatures compared to July, suggesting a gradual yet noticeable warming trend as summer hits its stride. As residents bask in the heat, they are also treated to the warm evenings that linger comfortably above 20°C. The consistent warmth of August encourages outdoor activities, even as the sun blazes down, making it a quintessential summer month in San Antonio.
In August, San Antonio experiences a moderate reduction in precipitation, with 56 mm (2.2 in) of rain falling over the course of 6 days. This trend follows a particularly wet May, which arrives at a peak of 130 mm (5.1 in), and is indicative of a shift towards drier conditions as summer winds down. The August rains provide a slight reprieve from the heat, contributing to the overall annual precipitation pattern that sees a notable increase from May through September before tapering off in the later months. This pattern highlights the transitional nature of San Antonio's climate, where the balance between wet and dry periods shapes the local environment.
In San Antonio, August marks a significant dip in humidity, reaching 58%, the lowest point of the year. This decrease is notable after the summer months of June and July, where humidity levels were considerably higher at 76% and 66%, respectively. As the region transitions from the sweltering heat of summer into the more temperate early fall, August offers a brief respite from the muggy conditions typical of earlier months. The overall trend throughout the year reveals a peak in humidity during the winter months, particularly in December at 86%, while the late summer months present an opportunity to enjoy drier air, making August a refreshing end to the season.
In August, San Antonio experiences a high UV Index of 12, categorizing exposure as extreme. This trend of increasing UV levels starts earlier in the year, peaking in the summer months, where both June and July also record a UV Index of 12. As a result, residents and visitors alike should remain vigilant, with a minimal burn time of just 10 minutes indicating the need for effective sun protection. Following August, the UV Index begins to taper off slightly, with September still maintaining an extreme level of 11. This consistent rise and subsequent gradual decline highlights the importance of sun safety as summer transitions into fall. For more details on sun exposure, check out San Antonio UV Index.
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As summer gently begins to wane in San Antonio, August boasts an impressive 330 hours of sunshine, continuing the trend of vibrant days that started in early summer. Following a peak in July with 344 hours of radiant sunlight, August remains a strong contender, offering plenty of opportunities for outdoor activities and enjoying the city’s lively atmosphere. The months leading up to August, especially June and July, showcased a warm progression of sunny hours, with each month basking in increasing light—276 hours in May blossoming into 325 hours by June. As the year transitions into fall, the sunshine gradually recedes, but August stands as a vivid reminder of summer’s lingering embrace in San Antonio.
In San Antonio, August experiences a 40% chance of sunny weather, a figure that reflects a subtle dip compared to the earlier summer months of June and July, both at 34%. While August may not be the sunniest month, it still offers a decent opportunity for clear skies, especially as the city transitions into the more favorable sunny conditions of September, which boasts a robust 61% chance. This trend highlights how summer in San Antonio can be somewhat unpredictable, but as the month progresses, the allure of sunnier days beckons for those looking to enjoy the outdoors.
In San Antonio, the month of August continues the trend of abundant sunshine, boasting an impressive 13 hours of daylight. This extended daylight mirrors the peak summer months of June and July, allowing residents and visitors alike to fully enjoy outdoor activities and events under the warm Texas sun. As summer edges towards its end, the daylight gradually begins to wane in September, signaling the end of the long, sun-soaked days that define the warmer months. The consistency of 13 hours of daylight throughout late spring and summer not only emphasizes the region's vibrant outdoor lifestyle but also the shifting patterns that lead into the cooler fall months.
In San Antonio, August marks a gently breezy end to the summer, with average wind speeds settling at a mild 2.6 m/s (6 mph). This trend of declining winds begins in July and continues into September, suggesting a tranquil atmosphere as the city shifts from hot summer days to the slight coolness of autumn. Interestingly, this period experiences some of the lightest winds of the year, creating a serene backdrop for outdoor activities. While the summer months see a gradual decrease in wind speed from a peak of 4.0 m/s (9 mph) in March, August's calmness perfectly complements the heat, inviting residents and visitors alike to indulge in San Antonio's vibrant culture amidst the gentle whisper of the August wind.
The weather in San Antonio 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 Antonio and find detailed weather information for every month.
In August, the weather is typically hot, with average temperatures around 30°C (86°F) and highs reaching up to 40°C (103°F), accompanied by moderate humidity levels of 58%. Rainfall is relatively low, with about 56 mm (2.2 inches) spread over six rainy days. In contrast, January brings cooler temperatures, with an average of 11°C (53°F) and a maximum of 27°C (81°F). The coldest nights can dip as low as -7°C (20°F), while the humidity increases to 79%, creating a stark difference in climate. Precipitation remains light in January, totaling 44 mm (1.7 inches) over six days. For more detailed information on January weather, visit San Antonio weather in January.
When comparing the weather in August and February, a stark contrast emerges. August boasts warmer temperatures with a minimum of 20°C (69°F) and an average high reaching 30°C (86°F), peaking at 40°C (103°F). In contrast, February experiences much cooler temperatures, with lows dipping to -12°C (10°F) and an average of only 13°C (55°F), while max temperatures can reach up to 31°C (87°F). Furthermore, February tends to be wetter, with precipitation recorded on 10 days and totaling 58 mm (2.3 in), compared to August's 6 days and 56 mm (2.2 in). February's higher humidity level of 79% adds to the chill in the air, while August maintains a more comfortable humidity of 58%. For more details, check out San Antonio weather in February.
August and March present quite a contrast in weather patterns. In August, temperatures soar with a minimum of 20°C (69°F), averaging around 30°C (86°F), and peaking at a scorching 40°C (103°F). The month sees about 56 mm (2.2 in) of precipitation over approximately 6 days, accompanied by a humidity level of 58%. In contrast, March experiences cooler temperatures, starting from a minimum of -3°C (27°F), averaging 18°C (65°F), and reaching a maximum of 33°C (91°F). Precipitation during March is slightly higher at 62 mm (2.5 in), occurring over 9 days, and the humidity is notably higher at 74%. For a deeper understanding of March's weather specifics, check out San Antonio weather in March.
August and April present contrasting weather patterns. In August, temperatures tend to soar, with averages around 30°C (86°F) and highs reaching up to 40°C (103°F), accompanied by a lower humidity of 58%. Precipitation is relatively minimal, totaling 56 mm (2.2 in) over about 6 days. In stark contrast, April features much cooler temperatures, with a minimum of 3°C (37°F) and an average of 21°C (70°F), peaking at 35°C (95°F). The humidity is significantly higher at 76%, and rainfall is more frequent, totaling 71 mm (2.8 in) over 8 days. For a detailed look at April’s weather, you can visit San Antonio weather in April.
When comparing the weather in August and May, one can see significant differences in temperature and humidity. August typically features higher temperatures with a minimum of 20°C (69°F), averaging 30°C (86°F), and peaking at 40°C (103°F). In contrast, May is cooler, with temperatures ranging from a minimum of 11°C (51°F) to an average of 25°C (77°F), and a maximum of 37°C (99°F). Additionally, humidity levels are notably higher in May at 81%, compared to 58% in August. Precipitation also varies, with May receiving more rain (130 mm over 15 days) than August (56 mm over 6 days). For more detailed information, check out San Antonio weather in May.
When comparing the weather in August and June, we see some notable differences. August typically has a slightly higher average temperature of 30°C (86°F) compared to June's average of 28°C (83°F). However, June features a maximum temperature that can reach up to 39°C (103°F), similar to August, but with a more humid environment, peaking at 76% humidity. On the precipitation front, June receives more rainfall, totaling 78 mm (3.1 in) over 12 days, whereas August has only 56 mm (2.2 in) over 6 days. For more detailed information on June weather, check out San Antonio weather in June.
In comparing the weather of August and July, August tends to be slightly warmer, with average temperatures reaching 30°C (86°F) compared to July's 29°C (85°F). However, July records a higher maximum temperature of 41°C (106°F) versus August's maximum of 40°C (103°F). Precipitation is also more significant in July, with 69 mm (2.7 in) recorded over 8 days, while August sees 56 mm (2.2 in) across 6 days. Additionally, July has a higher humidity level at 66%, compared to August's 58%. For more detailed information on July's climate, you can check San Antonio weather in July.
August weather is characterized by higher temperatures, with minimums around 20°C (69°F) and average highs reaching 30°C (86°F), peaking at 40°C (103°F). The month experiences relatively low precipitation, totaling 56 mm (2.2 in) over about 6 days, and humidity levels hover around 58%. In contrast, September brings a noticeable drop in minimum temperatures to 12°C (54°F), while the average temperature is still warm at 27°C (80°F). Although maximum temperatures can reach up to 39°C (102°F), the month is generally wetter, with 117 mm (4.6 in) of rain spreading over 10 days and slightly higher humidity at 65%. For a detailed overview of September weather, check out San Antonio weather in September.
The contrast between August and October weather is quite striking. In August, temperatures range from a minimum of 20°C (69°F) to a scorching maximum of 40°C (103°F), with an average temperature around 30°C (86°F). The month sees about 56 mm (2.2 in) of precipitation over six days, coupled with a humidity level of 58%. In sharp contrast, October experiences much cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 37°C (98°F), averaging 22°C (72°F). Rainfall increases to 89 mm (3.5 in) over ten days, and humidity rises to 74%. For more details on October weather patterns, you can check out San Antonio weather in October.
In August, temperatures in San Antonio soar with a minimum of 20°C (69°F), averaging around 30°C (86°F), and peaking at a scorching 40°C (103°F). The humidity is relatively moderate at 58%, and the city experiences about 56 mm (2.2 inches) of precipitation over six days. Conversely, November brings a dramatic shift in weather, with temperatures dropping significantly to a minimum of -4°C (25°F), averaging 16°C (61°F), and peaking at a more comfortable 32°C (90°F). While precipitation decreases to 46 mm (1.8 inches), the humidity rises to 81%, making the air feel chillier. For more detailed insights, check out San Antonio weather in November.
August and December present stark contrasts in weather patterns. In August, temperatures soar to an average of 30°C (86°F), with highs reaching up to 40°C (103°F), while the humidity sits at a comfortable 58%. On the other hand, December brings a significant drop in temperature, with averages around 13°C (56°F) and lows plunging to -3°C (27°F). The increased humidity in December at 86% also contributes to a chillier atmosphere, despite similar precipitation levels in both months—56 mm (2.2 in) in August compared to 57 mm (2.3 in) in December, with slightly more rainy days in December. For more details, you can check San Antonio weather in December.
As August settles in over San Antonio, the weather takes on a distinctive character, offering a blend of scorching heat and occasional relief. With maximum temperatures peaking at around 40°C (103°F), this month stands out as one of the hottest, contrasting sharply with the milder mornings and evenings typical of other times in the year. Despite high humidity levels of 58%, the occasional rainfall—over just six days—provides brief interludes from the sweltering climate, delivering much-needed moisture to the often parched surroundings. For a more detailed exploration of San Antonio's weather patterns throughout the year, be sure to check out San Antonio Climate.