May weather forecast and climate
Mill Valley, CA

Weather in May

The last month of the spring, May, is also an enjoyable month in Mill Valley, California, with average temperature fluctuating between 64.9°F (18.3°C) and 50.4°F (10.2°C).

Temperature

In Mill Valley, the average high-temperature in May is almost the same as in April - a still enjoyable 64.9°F (18.3°C). In Mill Valley, in May, the average low-temperature is 50.4°F (10.2°C).

Humidity

In May, the average relative humidity is 75%.

Rainfall

In Mill Valley, it is raining for 3.3 days, with typically 0.28" (7mm) of accumulated precipitation. In Mill Valley, during the entire year, the rain falls for 48 days and collects up to 3.94" (100mm) of precipitation.

Daylight

In Mill Valley, the average length of the day in May is 14.2h.

Sunshine

The average sunshine in Mill Valley is 10h.

UV index

The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in May in Mill Valley?

In May, in Mill Valley, California, the average high-temperature is 64.9°F (18.3°C), and the average low-temperature is 50.4°F (10.2°C).

What is the average humidity in May in Mill Valley?

In May, the average relative humidity is 75%.

How much does it rain in Mill Valley in May?

In Mill Valley, during May, the rain falls for 3.3 days and regularly aggregates up to 0.28" (7mm) of precipitation.

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

In Mill Valley, California, the average length of the day in May is 14.2h.

How many hours of sunshine does Mill Valley have in May?

The average sunshine in May in Mill Valley is 10h.

What is the UV index intensity in May in Mill Valley?

The average daily maximum UV index in May in Mill Valley, California, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Mill Valley, CA

Average temperature in May - Mill Valley, CA
  • Average high temperature in May: 64.9°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 May: 50.4°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 May
Mill Valley, CA

Average pressure in May - Mill Valley, CA
  • Average pressure in May: 29.98"

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 May
Mill Valley, CA

Average wind speed in May - Mill Valley, CA
  • Average wind speed in May: 7.8mph

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 May
Mill Valley, CA

Average humidity in May - Mill Valley, CA
  • Average humidity in May: 75%

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 May
Mill Valley, CA

Average rainfall in May - Mill Valley, CA
  • Average rainfall in May: 0.28"

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 May
Mill Valley, CA

Average rainfall days in May - Mill Valley, CA
  • Average rainfall days in May: 3.3 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 May /
Average sunshine in May
Mill Valley, CA

Average daylight in May / Average sunshine in May - Mill Valley, CA
  • Average daylight in May: 14.2h

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 May: 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 May
Mill Valley, CA

Average sunshine days in May - Mill Valley, CA
  • Average sunshine days in May: 24.7 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 May
Mill Valley, CA

Average UV index in May - Mill Valley, CA
  • Average UV index in May: 4

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 May
Mill Valley, CA

Average cloud cover in May - Mill Valley, CA
  • Average cloud cover in May: 31

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 May
Mill Valley, CA

Average visibility in May - Mill Valley, CA
  • Average visibility in May: 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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