Mill Valley
California, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Mill Valley, CA

January, like December, is another mild winter month in Mill Valley, California, with average temperature varying between 45.5°F (7.5°C) and 56.1°F (13.4°C). In January, the average high-temperature is practically the same as in December - a still moderate 56.1°F (13.4°C). Weather in January »

The last month of the winter, February, is another mild month in Mill Valley, California, with average temperature varying between 45.9°F (7.7°C) and 57.9°F (14.4°C). In Mill Valley, the average high-temperature is practically the same as in January - a still moderate 57.9°F (14.4°C). Weather in February »

The first month of the spring, March, is also a moderate month in Mill Valley, California, with average temperature ranging between max 59.4°F (15.2°C) and min 46.9°F (8.3°C). In March, the average high-temperature is practically the same as in February - a still moderate 59.4°F (15.2°C). Weather in March »

April in Mill Valley, California, is an enjoyable spring month, with average temperature varying between 62.8°F (17.1°C) and 48.6°F (9.2°C). In Mill Valley, the average high-temperature is practically the same as in March - a comfortable 62.8°F (17.1°C). Weather in April »

The last month of the spring, May, is another comfortable month in Mill Valley, California, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 50.4°F (10.2°C). In Mill Valley, California, the average high-temperature is almost the same as in April - a still comfortable 64.9°F (18.3°C). Weather in May »

The first month of the summer, June, is an agreeable month in Mill Valley, California, with average temperature ranging between max 69.1°F (20.6°C) and min 53.2°F (11.8°C). In June, the average high-temperature is essentially the same as in May - an agreeable 69.1°F (20.6°C). Weather in June »

July, the same as June, in Mill Valley, California, is an agreeable summer month, with average temperature fluctuating between 54.3°F (12.4°C) and 70.5°F (21.4°C). In July, the average high-temperature is essentially the same as in June - a still pleasant 70.5°F (21.4°C). Weather in July »

August, the last month of the summer, in Mill Valley, is also an agreeable month, with average temperature ranging between max 71.2°F (21.8°C) and min 55.4°F (13°C). In August, the average high-temperature is almost the same as in July - a still pleasant 71.2°F (21.8°C). Weather in August »

September, the first month of the autumn, in Mill Valley, is still a pleasant month, with average temperature fluctuating between 72.3°F (22.4°C) and 56.1°F (13.4°C). With an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.1°F (13.4°C), September is the warmest month. Weather in September »

October, the same as September, in Mill Valley, California, is an agreeable autumn month, with average temperature fluctuating between 54.3°F (12.4°C) and 68.9°F (20.5°C). In October, the average high-temperature is relatively the same as in September - a still agreeable 68.9°F (20.5°C). Weather in October »

November, the last month of the autumn, in Mill Valley, is also an enjoyable month, with average temperature ranging between min 49.6°F (9.8°C) and max 61.5°F (16.4°C). In Mill Valley, California, the average high-temperature marginally drops, from an agreeable 68.9°F (20.5°C) in October, to an enjoyable 61.5°F (16.4°C). Weather in November »

December, the first month of the winter, in Mill Valley, is still a mild month, with average temperature varying between 55.4°F (13°C) and 45.3°F (7.4°C). December is the coldest month, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C). Weather in December »

How much does it rain in Mill Valley?

Throughout the year, there are 48 rainfall days, and 3.94" (100mm) of precipitation is accumulated.

When is the lowest UV index in Mill Valley?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.

What is the rainiest month in Mill Valley?

February is the month with the most rainfall. Rain falls for 5.3 days and accumulates 0.87" (22mm) of precipitation.

What is the most humid month in Mill Valley?

The most humid month in Mill Valley is March, with an average relative humidity of 77%.

What are the months with the highest UV index in Mill Valley?

April, June through September, with an average maximum UV index of 5, are months with the highest UV index.

What is the driest month in Mill Valley?

June through September are months with the least rain when the rain falls for 1.2 days and typically aggregates up to 0.04" (1mm) of rain.

When are the longest days in Mill Valley?

The month with the longest days in Mill Valley is June, with an average of 14.8h of daylight.

What month has the most sunshine in Mill Valley?

With an average of 11.2h of sunshine, July has the most sunshine of the year in Mill Valley, California.

What is the warmest month in Mill Valley?

With an average high-temperature of 72.3°F (22.4°C) and an average low-temperature of 56.1°F (13.4°C), September is the warmest month in Mill Valley.

What is the least humid month in Mill Valley?

October is the least humid month, with an average relative humidity of 68%.

What is the coldest month in Mill Valley?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C), December is the coldest month.

What is the month with the shortest days in Mill Valley?

With an average of 9.6h of daylight, December has the shortest days of the year.

What is the month with the least sunshine in Mill Valley?

December has the least sunshine of the year, with an average of 5.5h of sunshine.
Average temperature - Mill Valley, CA
Average rainfall - Mill Valley, CA

The wettest month (with the highest rainfall) is February (0.87").
Driest months (with the lowest rainfall) are June, July, August and September (0.04").

Average rainfall days - Mill Valley, CA

The month with the highest number of rainy days is March (8.8 days).
Months with the lowest number of rainy days are June and August (1.2 days).

Average daylight / Average sunshine - Mill Valley, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.6h).

The month with most sunshine is July (Average sunshine: 11.2h).
The month with least sunshine is December (Average sunshine: 5.5h).

Average UV index - Mill Valley, CA

Months with the highest UV index are April, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).