April weather forecast and climate
Mill Valley, CA

Weather in April

April in Mill Valley, California, is a comfortable spring month, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 48.6°F (9.2°C).

Temperature

In Mill Valley, California, the average high-temperature is essentially the same as in March - a comfortable 62.8°F (17.1°C). In April, the average low-temperature is 48.6°F (9.2°C).

Humidity

The average relative humidity in April is 74%.

Rainfall

In Mill Valley, during 5.5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. In Mill Valley, during the entire year, the rain falls for 48 days and collects up to 3.94" (100mm) of precipitation.

Daylight

In April, the average length of the day is 13.2h.

Sunshine

In Mill Valley, the average sunshine in April is 10h.

UV index

Months with the highest UV index are April, June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: In April, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in April in Mill Valley?

In April, in Mill Valley, California, the average high-temperature is 62.8°F (17.1°C), and the average low-temperature is 48.6°F (9.2°C).

What is the average humidity in April in Mill Valley?

In Mill Valley, California, the average relative humidity in April is 74%.

How many days does it rain in April in Mill Valley?

In Mill Valley, California, in April, it is raining for 5.5 days, with typically 0.2" (5mm) of accumulated precipitation.

What is the average length of the day in April in Mill Valley?

In April, the average length of the day in Mill Valley, California, is 13.2h.

How long on average sun shines in April in Mill Valley?

In April, the average sunshine in Mill Valley, California, is 10h.

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 UV index reading in April in Mill Valley?

The average daily maximum UV index in April in Mill Valley is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in April
Mill Valley, CA

Average temperature in April - Mill Valley, CA
  • Average high temperature in April: 62.8°F

The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in April: 48.6°F

The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).

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Average pressure in April
Mill Valley, CA

Average pressure in April - Mill Valley, CA
  • Average pressure in April: 30.03"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in April
Mill Valley, CA

Average wind speed in April - Mill Valley, CA
  • Average wind speed in April: 7.6mph

The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).

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Average humidity in April
Mill Valley, CA

Average humidity in April - Mill Valley, CA
  • Average humidity in April: 74%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in April
Mill Valley, CA

Average rainfall in April - Mill Valley, CA
  • Average rainfall in April: 0.2"

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

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Average rainfall days in April
Mill Valley, CA

Average rainfall days in April - Mill Valley, CA
  • Average rainfall days in April: 5.5 days

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

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Average daylight in April /
Average sunshine in April
Mill Valley, CA

Average daylight in April / Average sunshine in April - Mill Valley, CA
  • Average daylight in April: 13.2h

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

  • Average sunshine in April: 10h

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

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Average sunshine days in April
Mill Valley, CA

Average sunshine days in April - Mill Valley, CA
  • Average sunshine days in April: 23.3 days

The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).

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Average UV index in April
Mill Valley, CA

Average UV index in April - Mill Valley, CA
  • Average UV index in April: 5

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).

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Average cloud cover in April
Mill Valley, CA

Average cloud cover in April - Mill Valley, CA
  • Average cloud cover in April: 30

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).

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Average visibility in April
Mill Valley, CA

Average visibility in April - Mill Valley, CA
  • Average visibility in April: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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