Monthly 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 January

January, like December, is a moderate winter month in Half Moon Bay, California, with average temperature ranging between max 56.1°F (13.4°C) and min 49.1°F (9.5°C). In January, the average high-temperature is relatively the same as in December - a still mild 56.1°F (13.4°C). Weather in January »

Weather in February

February, the last month of the winter, in Half Moon Bay, is another mild month, with temperature in the range of an average low of 48.7°F (9.3°C) and an average high of 56.7°F (13.7°C). In February, the average high-temperature is relatively the same as in January - a still moderate 56.7°F (13.7°C). Weather in February »

Weather in March

March, the first month of the spring, in Half Moon Bay, is also a moderate month, with average temperature ranging between max 57.7°F (14.3°C) and min 49.3°F (9.6°C). In Half Moon Bay, the average high-temperature in March is practically the same as in February - a still moderate 57.7°F (14.3°C). Weather in March »

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). In Half Moon Bay, the average high-temperature is essentially the same as in March - a still moderate 58.6°F (14.8°C). Weather in April »

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). In May, the average high-temperature is relatively the same as in April - a still mild 60.4°F (15.8°C). Weather in May »

Weather in June

June, the first month of the summer, in Half Moon Bay, is a comfortable month, with average temperature ranging between max 63.7°F (17.6°C) and min 53.6°F (12°C). In June, the average high-temperature is practically the same as in May - a comfortable 63.7°F (17.6°C). Weather in June »

Weather in July

July, the same as June, is another enjoyable summer month in Half Moon Bay, California, with average temperature varying between 65.1°F (18.4°C) and 54.3°F (12.4°C). In Half Moon Bay, California, the average high-temperature is relatively the same as in June - a still comfortable 65.1°F (18.4°C). Weather in July »

Weather in August

The last month of the summer, August, is another comfortable month in Half Moon Bay, California, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 55.9°F (13.3°C). In Half Moon Bay, the average high-temperature in August is practically the same as in July - a still comfortable 65.8°F (18.8°C). Weather in August »

Weather in September

September, the first month of the autumn, in Half Moon Bay, is still a comfortable month, with average temperature ranging between min 56.7°F (13.7°C) and max 66.9°F (19.4°C). The warmest month is September, with an average high-temperature of 66.9°F (19.4°C) and an average low-temperature of 56.7°F (13.7°C). Weather in September »

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

Weather in November

The last month of the autumn, November, is also a moderate month in Half Moon Bay, California, with temperature in the range of an average low of 52.9°F (11.6°C) and an average high of 60.3°F (15.7°C). In November, the average high-temperature is almost the same as in October - a moderate 60.3°F (15.7°C). Weather in November »

Weather in December

December, the first month of the winter, in Half Moon Bay, is also a moderate month, with average temperature fluctuating between 55.6°F (13.1°C) and 49.3°F (9.6°C). December is the coldest month, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 49.3°F (9.6°C). Weather in December »
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FAQ

How many days does it rain in Half Moon Bay?

Throughout the year, in Half Moon Bay, there are 76.8 rainfall days, and 8.54" (217mm) of precipitation is accumulated.

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

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

What is the wettest month in Half Moon Bay?

February is the month with the most rainfall. Rain falls for 7.5 days and accumulates 1.61" (41mm) of precipitation.

What is the driest month in Half Moon Bay?

June and July are months with the least rain when the rain falls for 3 days and typically aggregates up to 0.12" (3mm) of rain.

When are the longest days in Half Moon Bay?

With an average of 14.7h of daylight, June has the longest days of the year.

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

Months with the highest UV index in Half Moon Bay are June, August and September, with an average maximum UV index of 5.

What month has the most sunshine in Half Moon Bay?

The month with the most sunshine is July, with an average of 11.4h of sunshine.

What is the most humid month in Half Moon Bay?

August is the most humid month in Half Moon Bay, California, with an average relative humidity of 82%.

What is the warmest month in Half Moon Bay?

With an average high-temperature of 66.9°F (19.4°C) and an average low-temperature of 56.7°F (13.7°C), September is the warmest month in Half Moon Bay, California.

What is the least humid month in Half Moon Bay?

November and December, with an average relative humidity of 72%, are the least humid months.

What is the coldest month in Half Moon Bay?

With an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 49.3°F (9.6°C), December is the coldest month in Half Moon Bay, California.

What is the month with the shortest days in Half Moon Bay?

The month with the shortest days in Half Moon Bay, California, is December, with an average of 9.6h of daylight.

What is the month with the least sunshine in Half Moon Bay?

With an average of 5.7h of sunshine, December has the least sunshine of the year.

Average temperature
Half Moon Bay, CA

Average temperature - Half Moon Bay, CA

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).

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
Half Moon Bay, CA

Average pressure - Half Moon Bay, CA

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
Half Moon Bay, CA

Average wind speed - Half Moon Bay, CA

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
Half Moon Bay, CA

Average humidity - Half Moon Bay, CA

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
Half Moon Bay, CA

Average rainfall - Half Moon Bay, CA

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
Half Moon Bay, CA

Average rainfall days - Half Moon Bay, CA

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 / Average sunshine
Half Moon Bay, CA

Average daylight / Average sunshine - Half Moon Bay, CA

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

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
Half Moon Bay, CA

Average sunshine days - Half Moon Bay, CA

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
Half Moon Bay, CA

Average UV index - Half Moon Bay, CA

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 visibility
Half Moon Bay, CA

Average visibility - Half Moon Bay, CA

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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