April 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 April

April, like March, is another mild spring month in Half Moon Bay, California, with average temperature varying between 50°F (10°C) and 58.6°F (14.8°C).

Temperature

In Half Moon Bay, the average high-temperature is essentially the same as in March - a still moderate 58.6°F (14.8°C). The average low-temperature, in Half Moon Bay, is 50°F (10°C).

Humidity

The average relative humidity in April is 77%.

Rainfall

In Half Moon Bay, during 7.2 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Half Moon Bay, during the entire year, the rain falls for 76.8 days and collects up to 8.54" (217mm) of precipitation.

Daylight

In April, the average length of the day in Half Moon Bay is 13.2h.

Sunshine

In Half Moon Bay, the average sunshine in April is 10h.

UV index

Months with the lowest UV index in Half Moon Bay are January through May, July, October through December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 April in Half Moon Bay?

In April, in Half Moon Bay, California, the average high-temperature is 58.6°F (14.8°C), and the average low-temperature is 50°F (10°C).

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

The average relative humidity in April in Half Moon Bay, California, is 77%.

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

In Half Moon Bay, California, in April, it is raining for 7.2 days, with typically 0.43" (11mm) of accumulated precipitation.

What is the average length of the day in April in Half Moon Bay?

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

How long on average sun shines in April in Half Moon Bay?

In April, the average sunshine is 10h.

What is the month with the lowest UV index in Half Moon Bay?

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

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

In April, the average daily maximum UV index in Half Moon Bay is 4. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in April
Half Moon Bay, CA

Average temperature in April - Half Moon Bay, CA
  • Average high temperature in April: 58.6°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 April: 50°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 April
Half Moon Bay, CA

Average pressure in April - Half Moon Bay, CA
  • Average pressure in April: 30.04"

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 April
Half Moon Bay, CA

Average wind speed in April - Half Moon Bay, CA
  • Average wind speed in April: 9.6mph

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 April
Half Moon Bay, CA

Average humidity in April - Half Moon Bay, CA
  • Average humidity in April: 77%

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 April
Half Moon Bay, CA

Average rainfall in April - Half Moon Bay, CA
  • Average rainfall in April: 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 April
Half Moon Bay, CA

Average rainfall days in April - Half Moon Bay, CA
  • Average rainfall days in April: 7.2 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 April /
Average sunshine in April
Half Moon Bay, CA

Average daylight in April / Average sunshine in April - Half Moon Bay, CA
  • Average daylight in April: 13.2h

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 April: 10h

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 April
Half Moon Bay, CA

Average sunshine days in April - Half Moon Bay, CA
  • Average sunshine days in April: 22 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 April
Half Moon Bay, CA

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

Average cloud cover in April - Half Moon Bay, CA
  • Average cloud cover in April: 30

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 April
Half Moon Bay, CA

Average visibility in April - Half Moon Bay, 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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