Last updated: February 24, 2025
In Mill Valley, October brings a delightful mix of mild temperatures and vibrant autumn scenery. With a maximum temperature reaching 31°C (88°F) and an average of 16°C (62°F), the weather remains pleasantly warm, while cool evenings drop to a minimum of 6°C (44°F). Despite the warmth, residents can expect a modest precipitation of 30 mm (1.2 in) over just two days, coupled with a humidity level hovering around 80%. This enchanting blend of conditions creates an inviting atmosphere for outdoor activities and enjoying the stunning fall foliage in this picturesque locale.
In Mill Valley, October ushers in a delightful transition with temperatures falling into a comfortable range. The average temperature settles at around 16°C (62°F), complemented by a minimum of 6°C (44°F) and a pleasant maximum of 31°C (88°F). This month marks a subtle shift towards cooler autumn air while still embracing the warmth of lingering late summer days. As the temperatures gradually decrease from September's heat, the evenings become crisp, creating an ideal backdrop for cozy gatherings and vibrant fall foliage. Thus, October in Mill Valley invites both warmth and refreshing coolness, perfect for enjoying the beautiful scenery and outdoor activities.
In Mill Valley, October marks a notable transition in the weather, with an average precipitation of 30 mm (1.2 in) typically falling over just 2 days. This increase in rainfall signals the onset of the wetter months ahead, following a notably dry summer where precipitation was minimal. While the amounts in October are relatively modest compared to the downpours seen earlier in the year, they herald a gradual shift back to the rainier pattern characteristic of the fall and winter seasons. Notably, the rainfall in October is significantly higher than the negligible amounts experienced in the summer, providing a refreshing change and replenishing the local environment as autumn settles in.
As October rolls in Mill Valley, the humidity experiences a gentle decline, settling at 80%. This marks a subtle transition from the peak levels observed in the summer months, where July and August averaged a high 87%. Following this summer humidity, September maintains a robust 86%, but by October, we see a shift toward drier air as fall settles in. This pattern reflects the gradual decrease in humidity that continues through the year, with November and December both recording a comfortable 79%. Overall, October in Mill Valley showcases a blend of lingering warmth and the refreshing onset of autumn, providing a brief reprieve before the winter months arrive.
As October unfolds in Mill Valley, the UV Index reflects a noticeable drop from the intense heights of summer. With a UV Index of 6, categorized as high, residents and visitors can expect a burn time of 25 minutes before sun protection becomes essential. This decrease from the extreme levels of 11 typical in July and August signifies a transition into milder fall weather, although caution is still warranted when enjoying the outdoors. The overall trend from January's moderate 3 to the peak summer indices highlights the importance of vigilance as the season shifts. For more detailed insights, check out the Mill Valley UV Index.
UV Risk Categories
In Mill Valley, October marks the transition into autumn, showcasing 280 hours of sunshine that beautifully bridge the warmth of summer and the crispness of fall. This month's sunlight hours reflect a gentle decline from the peak of July's 386 hours, yet remain significantly vibrant compared to the winter months ahead. Notably, the trend exhibits a steady increase from January's 148 hours to October, reaching a high point in June and July before gradually tapering off. As the sunlight softens, it sets the stage for the stunning autumn foliage that Mill Valley is renowned for, inviting residents and visitors alike to bask in the golden hues of this picturesque season.
As autumn settles in Mill Valley, the likelihood of sunny weather in October reflects a transition from the warmer months. With a 51% chance of sunshine, October offers a balanced blend of vibrant fall colors and occasional sunny days, mirroring the trends seen in the previous months. Following the peak sun exposure of May at 75%, sunshine starts to wane slightly in the latter half of the year. Yet, compared to the gloomier winter months like December, which sees only a 30% chance of sun, October stands out as an inviting time to enjoy the outdoors while soaking in the gorgeous scenery. Whether you're taking a stroll through the redwoods or savoring the crisp autumn air, you can still expect some bright moments amidst the changing seasons.
In Mill Valley, October marks the transition from the abundant daylight of summer to the more subdued light of autumn, with an average of 11 hours of daylight. This gradual decline follows a peak in May and June, where daylight stretches to 14 hours, creating a vibrant and lively atmosphere. As the year progresses, the daylight hours steadily decrease, reflecting a seasonal shift that is both beautiful and poignant. By the time we reach November and December, daylight dwindles to 10 and 9 hours respectively, as the shorter days embrace the cozy essence of winter. This rhythmic ebb and flow of daylight not only shapes the local landscape but also influences the rhythm of life in this picturesque town.
As October arrives in Mill Valley, the winds begin to whisper stories of autumn, with an average speed of 3.2 m/s (7 mph), slightly above the gentle breezes of September. This moderate increase hints at the transition towards winter months, when the winds drop to their lowest in November at 2.2 m/s (5 mph). Throughout the year, wind speeds show a gradual rise from early spring, peaking in May at 4.8 m/s (11 mph), before beginning to subside as the days grow shorter. The soft winds of October create a serene atmosphere, ideal for enjoying the vibrant fall foliage while foreshadowing the quieter, calmer conditions of the winter months ahead.
The weather in Mill Valley changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October'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.
In October, the weather is generally warmer, with temperatures ranging from a minimum of 6°C (44°F) to a maximum of 31°C (88°F) and an average of 16°C (62°F). The month experiences relatively low precipitation, averaging only 30 mm (1.2 in) over just 2 days, and has a humidity level of around 80%. In contrast, January ushers in colder temperatures, with a minimum of 0°C (33°F) and a maximum of 23°C (73°F), averaging 10°C (51°F). This winter month is significantly wetter, receiving 111 mm (4.4 in) of rainfall over 8 days, and humidity rises slightly to 85%. For more detailed insights, check out Mill Valley weather in January.
In comparing the weather of October and February, October generally offers warmer temperatures, with minimums around 6°C (44°F) and maximums reaching up to 31°C (88°F), resulting in an average of 16°C (62°F). In contrast, February experiences cooler weather, with minimum temperatures dropping to 2°C (35°F) and maximums capping at 23°C (73°F), averaging at 11°C (52°F). Precipitation also differs significantly, as October only sees about 30 mm (1.2 in) over just 2 days, while February is much wetter, with 116 mm (4.6 in) spread over 8 days, contributing to a higher humidity level of 82%. For more detailed insights, you can visit Mill Valley weather in February.
In October, the weather showcases a broader temperature range, with minimums around 6°C (44°F) and maximums reaching up to 31°C (88°F), while experiencing relatively low precipitation of 30 mm over just 2 days. The average temperature of 16°C (62°F) and humidity at 80% create a warm and inviting atmosphere. In contrast, March presents cooler temperatures, ranging from a minimum of 4°C (39°F) to a maximum of 24°C (75°F), with significantly higher precipitation at 80 mm spread across 10 days. The average temperature dips to 12°C (54°F) with slightly higher humidity at 82%, making the month feel more damp and less predictable. For a detailed look at what to expect, you can visit Mill Valley weather in March.
When comparing the weather in October and April, we see distinct differences in temperature and precipitation. October typically boasts a wider temperature range with a minimum of 6°C (44°F) and a maximum reaching up to 31°C (88°F), while April experiences slightly cooler temperatures, ranging from a minimum of 4°C (40°F) to a maximum of 28°C (83°F). Precipitation is more frequent in April, occurring over five days and totaling 35 mm (1.4 in), compared to October's two days of rain and 30 mm (1.2 in). Additionally, humidity levels are quite similar in both months, with October at 80% and April at 79%. For a closer look at the specific conditions in April, you can refer to Mill Valley weather in April.
In October, temperatures can vary significantly, ranging from a chilly 6°C (44°F) at night to a warm 31°C (88°F) during the day, with an average of 16°C (62°F). The month sees about 30 mm (1.2 in) of precipitation over two days, with humidity levels around 80%. In contrast, May experiences slightly warmer nights with a minimum temperature of 7°C (45°F) and a similar maximum of 30°C (86°F), averaging 15°C (60°F). May also has less rainfall, totaling 20 mm (0.8 in) over the same two days, with humidity just a bit higher at 83%. For a closer look at the specifics, check out Mill Valley weather in May.
The weather in October showcases a wider temperature range compared to June, with minimum temperatures dipping to 6°C (44°F) and maximums reaching 31°C (88°F). While October sees an average temperature of 16°C (62°F) and experiences some precipitation (30 mm over 2 days), June typically remains drier with just 2 mm of rain and no rainy days. Humidity levels are relatively high in both months, with October at 80% and June slightly higher at 84%. For a more detailed look at June's weather, you can explore Mill Valley weather in June.
In comparing October and July weather, October presents a wider temperature range with minimums dipping to 6°C (44°F) and maximums reaching 31°C (88°F), while July has a more stable range with minimums of 11°C (52°F) and maximums at 30°C (87°F). Despite October's higher maximum temperature, it tends to be cooler on average, sitting at 16°C (62°F) compared to July's average of 17°C (63°F). Precipitation is notably more frequent in October, with 30 mm falling over two days, unlike July, which sees almost no rainfall at just 2 mm over zero days. Humidity remains relatively high in both months, with October at 80% and July slightly higher at 87%. For a deeper look at July conditions, you can check out Mill Valley weather in July.
In comparing the weather of October and August, October experiences a wider range of temperatures, with minimums dipping to 6°C (44°F) and maximums reaching 31°C (88°F), while August maintains a higher minimum of 11°C (52°F) and peaks at 32°C (90°F). October also sees slightly more precipitation, totaling 30 mm (1.2 in) over 2 days, compared to August's virtually dry conditions with only 1 mm (0.1 in) and no recorded rainy days. Both months exhibit high humidity, with August at 87% and October at 80%, but the cooler temperatures in October can make the humidity feel more pronounced. For a detailed look at August's weather, you can check out Mill Valley weather in August.
In comparing the weather of October and September, we see a notable decrease in both average temperatures and maximum highs. October's temperatures range from a minimum of 6°C (44°F) to a maximum of 31°C (88°F), while September features higher temperatures, with a low of 9°C (49°F) and a peak that can soar to 36°C (98°F). Furthermore, October experiences slightly more precipitation, receiving about 30 mm over 2 days as opposed to September's minimal 2 mm with no rainy days at all. Despite this, September maintains a slightly higher humidity level at 86%, compared to October's 80%. For more detailed insights, you can check Mill Valley weather in September.
October experiences warmer temperatures, with average highs reaching up to 31°C (88°F), while November sees a noticeable drop, with an average maximum of 25°C (77°F). In terms of precipitation, November is wetter, recording 48 mm (1.9 in) over five days compared to October's 30 mm (1.2 in) on just two days. Despite the slightly higher levels of humidity in October at 80%, November remains close behind with 79%. For more detailed insights, you can check Mill Valley weather in November.
October typically presents a wider temperature range, with highs reaching up to 31°C (88°F) and averaging around 16°C (62°F). In contrast, December tends to be cooler, with maximum temperatures peaking at 22°C (72°F) and an average of just 10°C (51°F). Additionally, October experiences less rainfall, with only 30 mm (1.2 in) falling over just two days, while December sees significantly more precipitation at 98 mm (3.9 in) spread across nine days. Both months feature high humidity levels, although October is slightly more humid at 80%, compared to December's 79%. For a detailed look at the weather conditions specific to December, visit Mill Valley weather in December.
As October unfolds in Mill Valley, the weather presents a delightful blend of warmth and chill, distinguishing this month from the sweltering summer and cooler winter seasons. With an average temperature hovering around a comfortable 16°C (62°F), residents experience pleasant days, interspersed with cool nights that hint at the approaching winter. Despite a modest rainfall of just 30 mm over a couple of days, humidity levels rise to a notable 80%, adding a refreshing crispness to the autumn air. This unique combination of mild days and brisk nights enhances the vibrant fall foliage, making October a perfect time to enjoy the stunning landscapes. For more details on what to expect year-round, visit Mill Valley Climate.