October 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 October

October, the same as September, is another comfortable autumn month in Half Moon Bay, California, with average temperature ranging between min 55.9°F (13.3°C) and max 64.6°F (18.1°C).

Temperature

In Half Moon Bay, the average high-temperature is relatively the same as in September - a still enjoyable 64.6°F (18.1°C). In October, the average low-temperature is 55.9°F (13.3°C).

Humidity

In October, the average relative humidity is 74%.

Rainfall

In Half Moon Bay, during October, the rain falls for 4.9 days and regularly aggregates up to 0.43" (11mm) of precipitation. 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 October, the average length of the day is 11.2h.

Sunshine

In October, the average sunshine in Half Moon Bay is 6.9h.

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 estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: In October, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 October in Half Moon Bay?

In Half Moon Bay, California, in October, the average high-temperature is 64.6°F (18.1°C), and the average low-temperature is 55.9°F (13.3°C).

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

The average relative humidity in October is 74%.

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

In Half Moon Bay, in October, during 4.9 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.

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

In Half Moon Bay, the average length of the day in October is 11.2h.

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

In October, the average sunshine in Half Moon Bay, California, is 6.9h.

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 October in Half Moon Bay?

In October, the average daily maximum UV index in Half Moon Bay is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in October
Half Moon Bay, CA

Average temperature in October - Half Moon Bay, CA
  • Average high temperature in October: 64.6°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 October: 55.9°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 October
Half Moon Bay, CA

Average pressure in October - Half Moon Bay, CA
  • Average pressure in October: 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 October
Half Moon Bay, CA

Average wind speed in October - Half Moon Bay, CA
  • Average wind speed in October: 7.1mph

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 October
Half Moon Bay, CA

Average humidity in October - Half Moon Bay, CA
  • Average humidity in October: 74%

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 October
Half Moon Bay, CA

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

Average rainfall days in October - Half Moon Bay, CA
  • Average rainfall days in October: 4.9 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 October /
Average sunshine in October
Half Moon Bay, CA

Average daylight in October / Average sunshine in October - Half Moon Bay, CA
  • Average daylight in October: 11.2h

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 October: 6.9h

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 October
Half Moon Bay, CA

Average sunshine days in October - Half Moon Bay, CA
  • Average sunshine days in October: 24.6 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 October
Half Moon Bay, CA

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

Average cloud cover in October - Half Moon Bay, CA
  • Average cloud cover in October: 20

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 October
Half Moon Bay, CA

Average visibility in October - Half Moon Bay, CA
  • Average visibility in October: 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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