Last updated: February 24, 2025
In Mill Valley, United States, August showcases a delightful weather profile characterized by warm temperatures and minimal precipitation. The maximum temperature reaches a sizzling 32°C (90°F), while the average temperature settles at a pleasant 18°C (64°F), providing a comfortable climate for outdoor activities. With a minimum temperature of 11°C (52°F), the evenings remain refreshingly cool. Notably, August experiences a scant 1 mm (0.1 in) of precipitation over 0 days, making it an ideal time for sun-soaked adventures. The humidity level hovers at 87%, adding a subtle touch of mugginess to the summery ambiance. Whether enjoying scenic hikes or relaxing in the sun, August is a splendid month to explore Mill Valley's natural beauty.
In August, Mill Valley's temperatures reflect the peak of summer, with a pleasant average of 18°C (64°F) that invites outdoor activities. The minimum temperature hovers at a comfortable 11°C (52°F), while daytime highs can soar to a warm 32°C (90°F). This month marks a subtle transition, as the city begins to cool slightly from the heat of July, where the maximum temperature barely drops to 30°C (87°F). The overall warmth and moderate temperatures create a delightful environment perfect for enjoying the area's stunning natural beauty, making August an ideal time for exploration and relaxation.
In Mill Valley, August marks a notable dip in precipitation, with only 1 mm (0.1 in) recorded throughout the month, and remarkably, there are no rainy days to speak of. This minimal rainfall aligns with the gradually drying trend seen since early summer, where June and July also register just 2 mm each. The dry spell emphasizes August's transition into the warmer months, culminating a period of reduced precipitation that began after the wetter months of January and February. As the season progresses, the pattern of dry conditions continues, with rain reemerging only in October. This trend highlights Mill Valley's typical Mediterranean climate, characterized by distinct wet and dry seasons.
In August, Mill Valley experiences a notable peak in humidity, sitting at 87%, which is consistent with the trend seen in July. The summer months, particularly from June through August, show a relative increase in humidity levels, creating a lush and vibrant atmosphere. This mid-year spike contrasts markedly with the drier conditions of late fall and winter, where humidity dips to around 79% by November and December. Overall, the fluctuating humidity levels not only define the region's seasonal character but also contribute to its rich greenery and picturesque landscapes, making Mill Valley a stunning summer destination.
In August, Mill Valley experiences a very high UV Index of 10, signaling a peak in sun intensity that requires caution during outdoor activities. This is a continuation of the intense UV exposure seen in the summer months, with a burn time of just 15 minutes for unprotected skin. The trend through the summer reveals an escalation from moderate UV levels in the earlier months of the year to an extreme peak in June and July, before slightly tapering off as autumn approaches. As you enjoy August's sunny days, it's crucial to stay mindful of sun protection to prevent burns and long-term skin damage. For more detailed insights on UV exposure, visit Mill Valley UV Index.
UV Risk Categories
In Mill Valley, August is a beacon of sunshine, boasting 348 hours of brilliant sunlight, which reflects a gradual decline from the peak of July’s 386 hours. This vibrant month sits comfortably within a summery trend, following a series of steadily increasing sunny days from January’s meager 148 hours to the lush heights of summer. From the gradual ascent starting in March, with 263 hours, to the warm finds of late spring and early summer, it's clear that Mill Valley thrives during these sunlit months. As the year progresses towards fall, the daylight gently recedes, giving way to September's 312 hours—a reminder that while August shines brightly, the enchanting warmth of summer is just beginning to wane.
In August, Mill Valley enjoys a 60% chance of sunny weather, making it one of the more favorable months for outdoor activities. This figure reflects a gradual decline from the vibrant 75% likelihood of sunshine in May, followed by fluctuations in the summer months that peak in early summer and dip as fall approaches. The trend demonstrates that while August is not the sunniest month of the year, it still provides a reassuringly bright backdrop for summer outings, with plenty of opportunities to soak up the sun before the cooler months set in. As summer transitions to fall, the likelihood of sunny days remains relatively stable, offering ideal weather for enjoying the natural beauty of Mill Valley.
In August, Mill Valley experiences a moderate decline in daylight, with the sun gracing the skies for approximately 13 hours. This marks a gentle transition from the height of summer in July, when daylight peaked at 14 hours. As the month progresses, the gradual shortening of days sets the stage for the upcoming fall, echoing the trend seen throughout the year. Starting from a low of 9 hours in January, the daylight hours swell to their summer zenith before tapering off, illustrating the natural rhythm of the seasons. August's daylight is still abundant, allowing residents to enjoy the lingering warmth and vibrant natural beauty, all while hinting at the cozy days of autumn ahead.
In Mill Valley, August greets residents with a gentle breeze, characterized by an average wind speed of 3.5 m/s (8 mph). This slight decline from July's 3.8 m/s (9 mph) signals the transition towards the quieter months of fall. Observing the annual trend, wind speeds tend to peak during the blooming spring months, reaching 4.8 m/s (11 mph) in May, and then gradually taper off as the year progresses. By the time November rolls around, the winds calm further, averaging just 2.2 m/s (5 mph). Such patterns create a serene backdrop for the lush landscape of Mill Valley, inviting locals and visitors alike to relish the tranquil summer nights before the autumn chill sets in.
The weather in Mill Valley 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 Mill Valley and find detailed weather information for every month.
August and January present starkly contrasting weather conditions. In August, the temperatures range from a mild 11°C (52°F) at night to a blistering 32°C (90°F) during the day, with minimal precipitation of just 1 mm over the course of the month, leading to pleasantly dry conditions and high humidity at 87%. Conversely, January features cooler temperatures, with lows dipping to 0°C (33°F) and highs reaching only 23°C (73°F). This month is significantly wetter, boasting 111 mm (4.4 in) of rain spread across 8 days, while the humidity remains relatively similar at 85%. For more detailed insights on January weather, you can visit Mill Valley weather in January.
August and February present strikingly different weather conditions. In August, temperatures range from a minimum of 11°C (52°F) to a maximum of 32°C (90°F), with an average of 18°C (64°F). This month is characterized by dry weather, receiving only 1 mm (0.1 in) of precipitation and 0 rainy days, while humidity is relatively high at 87%. In contrast, February experiences cooler temperatures, with a minimum of 2°C (35°F) and a maximum of 23°C (73°F), averaging 11°C (52°F). The month is much wetter, with 116 mm (4.6 in) of precipitation over about 8 days, and a slightly lower humidity level of 82%. For more details, you can visit Mill Valley weather in February.
August and March present notably contrasting weather patterns. August tends to be warmer, with average temperatures ranging from a minimum of 11°C (52°F) to a maximum of 32°C (90°F), and an impressively dry profile, averaging only 1 mm of precipitation over the month. In stark contrast, March experiences cooler temperatures, with averages between 4°C (39°F) and 24°C (75°F), accompanied by significantly higher precipitation levels, totaling 80 mm (3.1 in) over approximately 10 days. The humidity remains fairly high in both months, with August at 87% and March at 82%. For more detailed insights, you can check the Mill Valley weather in March.
When comparing the weather in August and April, it's clear that August is significantly warmer and drier. In August, temperatures range from a minimum of 11°C (52°F) to a maximum of 32°C (90°F), with an average of 18°C (64°F). The month experiences virtually no precipitation, with humidity levels at 87%. In contrast, April features cooler temperatures, with a minimum of 4°C (40°F) and a maximum of 28°C (83°F), averaging around 14°C (57°F). This month sees more rainfall, with a total of 35 mm (1.4 in) spread over five days and a lower humidity of 79%. For more details on April weather, you can visit Mill Valley weather in April.
When comparing the weather in August and May, it’s evident that August tends to be warmer and drier. In August, temperatures range from a minimum of 11°C (52°F) to a maximum of 32°C (90°F), with an average high of 18°C (64°F) and no recorded precipitation. In contrast, May experiences slightly cooler temperatures, ranging from 7°C (45°F) to 30°C (86°F), with an average high of around 15°C (60°F) and 20 mm (0.8 in) of rainfall spread over two days. Humidity is higher in August at 87%, compared to May’s 83%. For a detailed look at the weather specifics in May, you can check Mill Valley weather in May.
When comparing the weather in August and June, both months exhibit similar maximum temperatures, peaking at 32°C (90°F). However, August tends to be slightly warmer overall, with an average temperature of 18°C (64°F) compared to June’s 17°C (63°F). Interestingly, both months experience low levels of precipitation, but August records only 1 mm (0.1 in) compared to June’s 2 mm (0.1 in), and both have no rainy days. Humidity levels are also relatively comparable, with August at 87% and June slightly lower at 84%. For a more detailed look at June's weather patterns, you can visit Mill Valley weather in June.
In comparing the weather between July and August, August generally showcases slightly warmer temperatures, with average highs reaching up to 32°C (90°F) compared to July's maximum of 30°C (87°F). Both months experience similar humidity levels at 87%, creating a consistently muggy atmosphere. Interestingly, while July recorded 2 mm (0.1 in) of precipitation, August boasted completely dry conditions with no recorded rainfall, emphasizing August's drier climate. For more specific insights, you can check Mill Valley weather in July.
August typically features mild temperatures, with a minimum of 11°C (52°F) and an average of 18°C (64°F), reaching up to a maximum of 32°C (90°F). The month is characterized by very low precipitation, averaging just 1 mm (0.1 in) and experiencing no rainy days, while humidity remains relatively high at 87%. In contrast, September sees slightly cooler nights with a minimum temperature of 9°C (49°F) and a similar average of 18°C (65°F). Notably, September can reach higher daytime temperatures, peaking at 36°C (98°F). Precipitation increases slightly to 2 mm (0.1 in), although there are still no rainy days, and humidity remains nearly unchanged at 86%. For more detailed information, you can check Mill Valley weather in September.
In comparing the weather between August and October, both months exhibit warm temperatures, but October introduces a notable drop in the minimum and average temperatures. August typically sees a minimum of 11°C (52°F) and an average of 18°C (64°F), while October's figures are lower, with a minimum of 6°C (44°F) and an average of 16°C (62°F). Despite both months having similar maximum temperatures around 31°C (88°F), October experiences increased precipitation, receiving about 30 mm (1.2 in) over 2 days, contrasting sharply with August’s dry climate of negligible precipitation. Additionally, humidity levels decrease slightly in October to 80%, compared to August's higher 87%. For more detailed insights into October's weather, you can check out Mill Valley weather in October.
August and November showcase striking differences in weather conditions. In August, temperatures range from a cool 11°C (52°F) at night to a warm 32°C (90°F) during the day, with an average of 18°C (64°F). The month is characterized by minimal precipitation, totaling just 1 mm and experiencing no rain days, while humidity remains high at 87%. In contrast, November sees a more temperate climate with temperatures ranging from a chilly 3°C (37°F) to a pleasant 25°C (77°F), and an average of 13°C (55°F). This month experiences significantly more rainfall, accumulating 48 mm over 5 days, with humidity levels dropping slightly to 79%. For a detailed look at November's weather, visit Mill Valley weather in November.
August and December exhibit significant differences in weather patterns. During August, temperatures can soar, with a minimum of 11°C (52°F) and a maximum of 32°C (90°F), alongside very low precipitation and high humidity at 87%. In contrast, December features cooler temperatures, ranging from a minimum of 3°C (38°F) to a maximum of 22°C (72°F). This month experiences considerably more precipitation, totaling 98 mm (3.9 in) over 9 days, and slightly lower humidity at 79%. For more detailed information about December weather, you can visit Mill Valley weather in December.
In August, Mill Valley experiences a delightful transformation in weather, characterized by warm, sunny days and minimal precipitation, setting it apart from the cooler and wetter months that precede it. With average temperatures hovering around a pleasant 18°C (64°F) and peaks reaching up to 32°C (90°F), residents and visitors can enjoy the great outdoors under clear skies and low humidity levels of 87%. This month’s charm lies in its lack of rainfall, allowing for plenty of outdoor activities and events without the interruptions of dreary weather. For those interested in a deeper dive into the weather patterns throughout the year, visit Mill Valley Climate.