October weather forecast
Half Moon Bay, CA

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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, like September, in Half Moon Bay, California, is another comfortable autumn month, with an average temperature varying between 55.9°F (13.3°C) and 64.6°F (18.1°C).

Temperature

The dawn of October sees an average high-temperature of a still comfortable 64.6°F (18.1°C), subtly contrasting with September's 66.9°F (19.4°C). Nighttime temperatures in Half Moon Bay record an average of 55.9°F (13.3°C) throughout October.

Humidity

In October, the average relative humidity is 74%.

Rainfall

In Half Moon Bay, in October, it is raining for 4.9 days, with typically 0.43" (11mm) of accumulated precipitation. Throughout the year, 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 in October is 11h and 13min.
On the first day of the month, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of October, sunrise is at 7:34 am and sunset at 6:12 pm PDT.

Sunshine

In October, the average sunshine is 6.9h.

UV index

January through May, July, October through December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index of 4 during October translates into these guidelines:
Undertake precautions - Guarding against sun damage is counselled. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average October temperature in Half Moon Bay?

The high-temperature, in October, in Half Moon Bay, records 64.6°F (18.1°C), while the low-temperature is 55.9°F (13.3°C).

What is the average humidity in October?

The average relative humidity in October is 74%.

How many days does it rain in October?

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

What is the average length of the day in October?

The average day length in October in Half Moon Bay is 11h and 13min.

When are sunrise and sunset in October?

On the first day of October, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:12 pm PDT.

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

In October, the average sunshine duration is 6.9h.

When is the lowest UV index?

The months with the lowest UV index are January through May, July, October through December, with an average maximum UV index of 4.

What is the UV index reading in October?

In October, the average daily maximum UV index in Half Moon Bay is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

Average pressure in October
Half Moon Bay, CA

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

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

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).

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%).
The months with the lowest relative humidity are November and December (72%).

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").

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).

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: 11h and 1min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in October: 6h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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).
The months with the least sunshine days are March and August (18.8 days).

Average UV index in October
Half Moon Bay, CA

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

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

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).

Average visibility in October
Half Moon Bay, CA

Average visibility in October - Half Moon Bay, CA
  • Average visibility in October: 6mi

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

Half Moon Bay, California, USA

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