May weather forecast and climate
Half Moon Bay, CA

A warm and sunny day on a scenic beach in Half Moon Bay, California
A warm and sunny day on a scenic beach in Half Moon Bay, California

Weather in May

The last month of the spring, May, is also a moderate month in Half Moon Bay, California, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 60.4°F (15.8°C).

Temperature

In May, the average high-temperature is relatively the same as in April - a still mild 60.4°F (15.8°C). In May, in Half Moon Bay, the average low-temperature is 51.4°F (10.8°C).

Humidity

In May, the average relative humidity in Half Moon Bay is 79%.

Rainfall

In Half Moon Bay, California, during May, the rain falls for 6.8 days and regularly aggregates up to 0.43" (11mm) of precipitation. Throughout the year, in Half Moon Bay, there are 76.8 rainfall days, and 8.54" (217mm) of precipitation is accumulated.

Daylight

In Half Moon Bay, the average length of the day is 14.2h.

Sunshine

The average sunshine in Half Moon Bay is 10.1h.

UV index

Months with the lowest UV index are January through May, July, October through December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in May 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Half Moon Bay?

In May, in Half Moon Bay, the average high-temperature is 60.4°F (15.8°C), and the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in May in Half Moon Bay?

In Half Moon Bay, the average relative humidity in May is 79%.

How much does it rain in Half Moon Bay in May?

In May, in Half Moon Bay, the rain falls for 6.8 days. Throughout May, 0.43" (11mm) of precipitation is accumulated.

How many hours of daylight does Half Moon Bay have in May?

In May, the average length of the day in Half Moon Bay, California, is 14.2h.

How many hours of sunshine does Half Moon Bay have in May?

The average sunshine in May is 10.1h.

What are the months with the lowest UV index in Half Moon Bay?

January through May, July, October through December, with an average maximum UV index of 4, are months with the lowest UV index in Half Moon Bay, California.

How high is the UV index in May in Half Moon Bay?

In May, the average daily maximum UV index in Half Moon Bay, 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
Half Moon Bay, CA

Average temperature in May - Half Moon Bay, CA
  • Average high temperature in May: 60.4°F

The warmest month (with the highest average high temperature) is September (66.9°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in May: 51.4°F

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).

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Average pressure in May
Half Moon Bay, CA

Average pressure in May - Half Moon Bay, CA
  • Average pressure in May: 29.99"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in May
Half Moon Bay, CA

Average wind speed in May - Half Moon Bay, CA
  • Average wind speed in May: 9.3mph

The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in May
Half Moon Bay, CA

Average humidity in May - Half Moon Bay, CA
  • Average humidity in May: 79%

The month with the highest relative humidity is August (82%).
Months with the lowest relative humidity are November and December (72%).

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Average rainfall in May
Half Moon Bay, CA

Average rainfall in May - Half Moon Bay, CA
  • Average rainfall in May: 0.43"

The wettest month (with the highest rainfall) is February (1.61").
The driest months (with the least rainfall) are June and July (0.12").

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Average rainfall days in May
Half Moon Bay, CA

Average rainfall days in May - Half Moon Bay, CA
  • Average rainfall days in May: 6.8 days

The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is June (3 days).

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Average daylight in May /
Average sunshine in May
Half Moon Bay, CA

Average daylight in May / Average sunshine in May - Half Moon Bay, CA
  • Average daylight in May: 14.2h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in May: 10.1h

The month with the most sunshine is July (Average sunshine: 11.4h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in May
Half Moon Bay, CA

Average sunshine days in May - Half Moon Bay, CA
  • Average sunshine days in May: 20.9 days

The month with the most sunshine days is October (24.6 days).
Months with the least sunshine days are March and August (18.8 days).

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Average UV index in May
Half Moon Bay, CA

Average UV index in May - Half Moon Bay, CA
  • Average UV index in May: 4

Months with the highest UV index are June, August and September (UV index 5).
Months with the lowest UV index are January, February, March, April, May, July, October, November and December (UV index 4).

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Average cloud cover in May
Half Moon Bay, CA

Average cloud cover in May - Half Moon Bay, CA
  • Average cloud cover in May: 31

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 18).

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Average visibility in May
Half Moon Bay, CA

Average visibility in May - Half Moon Bay, 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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