Last updated: February 24, 2025
April in Mill Valley, United States, brings a delightful blend of mild temperatures and refreshing rainfall. With daytime highs reaching a pleasant 28°C (83°F) and an average of 14°C (57°F), residents can enjoy comfortable spring days. Nighttime lows dip to a cool 4°C (40°F), offering a crisp contrast. The month sees about 35 mm (1.4 in) of precipitation over 5 days, contributing to the area's lush landscape, while a humidity level of 79% adds a touch of freshness to the air. This harmonious mix of warmth and moisture creates a vibrant atmosphere, perfect for outdoor activities and appreciating nature's bloom.
April in Mill Valley, United States welcomes the onset of spring with delightful warmth, showcasing a significant rise in temperatures. The month begins with a minimum of 4°C (40°F), gradually climbing to an average of 14°C (57°F) and peaking at a maximum of 28°C (83°F). This striking increase from the earlier months of the year not only highlights the transition towards warmer days but also sets the stage for the lush greenery that characterizes the region in spring. Compared to March, where temperatures max out at 24°C (75°F), April offers a pleasing boost in warmth, making it an ideal time for outdoor activities and enjoying Mill Valley’s vibrant natural beauty. As the days grow longer and sunnier, visitors and locals alike can relish the perfect blend of comfortably cool mornings and pleasantly warm afternoons.
April in Mill Valley sees a significant drop in precipitation, measuring just 35 mm (1.4 in) over 5 days—a marked decrease from the wetter months preceding it. This decline sets the stage for a transition into the drier late spring and summer months, where rainfall dwindles even further, with only 20 mm (0.8 in) expected in May. Following the pattern established earlier in the year, the region experiences a notable reduction in both the amount of rain and the number of rainy days, indicating a shift towards a typically drier season that characterizes the climate of Mill Valley.
In April, Mill Valley begins to shift towards a more temperate climate, with the humidity dipping to 79%. This marks a gradual decline from the 85% peak in January, followed by consistent levels of 82% throughout February and March. As Spring progresses into May, humidity rises slightly to 83%, signaling the return of moisture in the air. Interestingly, this month serves as a transitional period, where the warmth of early summer begins to blend with the lingering freshness of winter, setting the stage for the higher humidity levels seen in the summer months. The overall trend indicates a typical fluctuation, with humidity levels peaking in the heart of summer before tapering off again in the fall and winter.
As April rolls into Mill Valley, the UV Index escalates to 9, categorized as very high, signaling a significant increase in sun intensity compared to earlier months. This means that the burn time is noticeably shorter, dropping to just 15 minutes before anyone could be at risk of skin damage. Following the trend from March's UV Index of 8, it's clear that spring heralds a sharp rise in UV exposure, paving the way for the even more intense rays of May at a striking 10. As the months progress towards summer, protecting your skin becomes increasingly crucial. For comprehensive UV forecasts and tips, explore more at Mill Valley UV Index.
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April in Mill Valley heralds the arrival of spring with a notable increase in sunshine, boasting 299 hours of sunlight—a delightful rise from 263 hours in March. This shift marks the beginning of a warm trend that continues into the sunnier months. As spring blossoms, sunlight hours progressively ramp up from April to May, with a striking 356 hours on the horizon. This upward trajectory peaks in the summer, where July enjoys the most hours of sunshine, making the vibrant sunny season a perfect time for outdoor adventures. As the year transitions into autumn, sunlight hours gradually decrease, yet April stands out as a pivotal moment of warmth and light that ushers in the thriving season ahead.
April marks a delightful transition into spring for Mill Valley, where the likelihood of sunny weather rises to a promising 66%. This trend reflects a steady increase in sunshine from the cooler winter months, where January starts at a modest 39%, and February sees a notable jump to 56%. As the days lengthen, March builds anticipation with 63% sunshine, paving the way for April's vibrant weather. Following this, May shines brightest, boasting an impressive 75% chance of sun. The warm embrace of late spring is just around the corner, making April an ideal time to enjoy the outdoors as the sunny days begin to prevail.
April marks a delightful shift in daylight duration for Mill Valley, with the sun gracing the skies for 13 hours each day. This increase is part of a gradual trend that began in the earlier months of the year, as the daylight lengthens from 9 hours in January to an impressive 14 hours by May. This steady progression not only heralds the arrival of spring but also invites residents and visitors alike to revel in outdoor activities under the brightening skies. Following April, daylight begins to taper off slightly in August, highlighting the seasonal ebb and flow, but for now, the lush landscapes of Mill Valley bask in the warmth of increasing light, making it a perfect time to explore the area's natural beauty.
As April arrives in Mill Valley, the wind begins to stir with a refreshing vigor, reaching an average speed of 4.1 m/s (9 mph). This increase marks a notable upward trend from the preceding months, particularly from the calmness of January, which recorded just 2.8 m/s (6 mph). The gentle breezes of early spring provide a contrast to the slightly stronger winds expected in May. While the months of March and April show a gradual rise, the wind speed will peak in May before tapering off again in the summer months. This seasonal shift not only invigorates the atmosphere but also heralds the transition into a vibrant spring, perfect for outdoor activities and enjoying the beauty of Mill Valley.
The weather in Mill Valley changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of April'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.
When comparing the weather in April and January, April tends to be milder and warmer with an average temperature of 14°C (57°F), while January's average temperature is cooler at 10°C (51°F). In April, temperatures can reach a maximum of 28°C (83°F), offering more sunshine and warmth than January, where the highest temperature only reaches 23°C (73°F). Precipitation is also notably higher in January, with 111 mm (4.4 in) of rain over 8 days compared to April’s 35 mm (1.4 in) over 5 days. Additionally, January's humidity is slightly higher at 85%, compared to April's 79%. For more insights, check out Mill Valley weather in January.
When comparing the weather in April and February, April typically offers warmer temperatures with a minimum of 4°C (40°F) and an average high of 28°C (83°F), while February sees slightly cooler temperatures ranging from a minimum of 2°C (35°F) to a maximum of 23°C (73°F). Precipitation levels also differ notably; February experiences much heavier rainfall at 116 mm (4.6 in) over 8 days, compared to April's 35 mm (1.4 in) over just 5 days. Humidity remains similar, with April at 79% and February slightly higher at 82%. For a more detailed look at February weather conditions, you can visit Mill Valley weather in February.
In comparing the weather of April and March, we see a slight increase in average temperatures in April, which range from a minimum of 4°C (40°F) to a maximum of 28°C (83°F), compared to March's temperatures of 4°C (39°F) to 24°C (75°F). April also experiences less precipitation, with 35 mm (1.4 in) over just five days, while March has significantly more, totaling 80 mm (3.1 in) across ten days. Humidity remains relatively consistent, with April at 79% and March slightly higher at 82%. For those interested in a more detailed look at March weather, visit Mill Valley weather in March.
April and May present a noticeable transition in weather conditions. In April, temperatures range from a minimum of 4°C (40°F) to a maximum of 28°C (83°F), with an average of 14°C (57°F). This month sees about 35 mm (1.4 in) of precipitation over approximately 5 days, accompanied by a humidity level of 79%. In contrast, May experiences slightly higher temperatures, with minimums of 7°C (45°F), average temperatures of 15°C (60°F), and maximums reaching 30°C (86°F). The precipitation decreases significantly to 20 mm (0.8 in) over just 2 days, while humidity rises to 83%. For more information, you can check Mill Valley weather in May.
April and June present distinct weather patterns. In April, temperatures range from a chilly 4°C (40°F) at night to a pleasant average of 14°C (57°F) during the day, peaking at 28°C (83°F) occasionally. This month also sees moderate precipitation of 35 mm (1.4 in) spread over about five days, coupled with a humidity level of 79%. In contrast, June enjoys milder temperatures, with nighttime lows of 10°C (51°F) and daytime averages around 17°C (63°F), reaching a high of 32°C (90°F). Notably, June benefits from significantly reduced rainfall, with only 2 mm (0.1 in) expected across the month, along with 0 days of recorded precipitation, though humidity slightly increases to 84%. For a more detailed look into June weather, you can refer to Mill Valley weather in June.
April and July exhibit distinct differences in weather patterns. In April, temperatures range from a low of 4°C (40°F) to a high of 28°C (83°F), with an average temperature of 14°C (57°F). This month experiences about 35 mm (1.4 in) of precipitation over 5 days, and humidity is at a moderate 79%. In contrast, July boasts warmer temperatures, with minimums around 11°C (52°F), an average temperature of 17°C (63°F), and a maximum of 30°C (87°F). Rainfall is significantly less in July, averaging just 2 mm (0.1 in) across the month, and no rainy days are reported, alongside a slightly higher humidity of 87%. For more detailed insights, check out Mill Valley weather in July.
April and August present quite contrasting weather patterns. April experiences cooler temperatures, with a minimum of 4°C (40°F) and an average of 14°C (57°F), while August brings in warmer conditions, starting at a minimum of 11°C (52°F) and averaging 18°C (64°F). Rainfall is more prevalent in April, with 35 mm (1.4 in) of precipitation occurring over 5 days, compared to the almost dry August, which sees only 1 mm (0.1 in) of rain over the entire month. Humidity levels are relatively high during both months, with April at 79% and August slightly higher at 87%. For more detailed insights, you can check Mill Valley weather in August.
April and September present distinct weather characteristics. In April, temperatures fluctuate between a minimum of 4°C (40°F) and a maximum of 28°C (83°F), with an average of 14°C (57°F). This month sees about 35 mm (1.4 in) of precipitation over five days and maintains a humidity level of 79%. In contrast, September boasts a warmer climate, with temperatures ranging from a minimum of 9°C (49°F) to a scorching maximum of 36°C (98°F) and an average of 18°C (65°F). Notably, September experiences significantly less precipitation at just 2 mm (0.1 in) across zero rainy days, accompanied by a higher humidity of 86%. For more details, you can check Mill Valley weather in September.
April and October offer contrasting yet pleasantly mild weather as spring transitions into autumn. In April, temperatures typically range from a minimum of 4°C (40°F) to a maximum of 28°C (83°F) with an average of 14°C (57°F). The month experiences about 35 mm (1.4 in) of rain over approximately 5 days, and the humidity sits at a comfortable 79%. In contrast, October tends to be slightly warmer, with temperatures ranging from a minimum of 6°C (44°F) to a maximum of 31°C (88°F), averaging at 16°C (62°F). Precipitation is lower in October, totaling around 30 mm (1.2 in) over just 2 days, while humidity is slightly higher at 80%. For a closer look at October's weather, check out Mill Valley weather in October.
April and November exhibit subtle yet notable differences in weather patterns. In April, temperatures range from a minimum of 4°C (40°F) to a maximum of 28°C (83°F), with an average temperature of 14°C (57°F). The month sees around 35 mm (1.4 in) of precipitation over five days, while humidity levels sit at 79%. Conversely, November experiences slightly cooler conditions, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 25°C (77°F), resulting in an average of 13°C (55°F). Precipitation increases to 48 mm (1.9 in), also occurring over five days, but the humidity remains constant at 79%. For a more detailed look, visit Mill Valley weather in November.
In comparing the weather between April and December, April typically enjoys warmer temperatures with a range from a chilly 4°C (40°F) to a pleasant high of 28°C (83°F), while December's temperatures are cooler, averaging around 10°C (51°F) and peaking at 22°C (72°F). Although both months share similar humidity levels at 79%, December tends to be wetter, receiving 98 mm (3.9 in) of precipitation over about 9 days, compared to April's 35 mm (1.4 in) over 5 days. Thus, while April may offer more sunshine, December presents a cooler and rainier climate. For more specific insights, you can check out Mill Valley weather in December.
April in Mill Valley marks a delightful transition into spring, featuring a refreshing mix of warmth and cool breezes. With an average temperature of 14°C (57°F), the month presents a noticeable contrast to the cooler winter months while still allowing for brisk days. Rainfall is moderate, with about 5 days of precipitation totaling 35 mm (1.4 in), nurturing the lush landscapes the area is known for. The humidity level, hovering around 79%, adds a touch of softness to the air, making outdoor exploration all the more enjoyable. For a deeper understanding of what to expect throughout the year, check out Mill Valley Climate.