Monthly weather forecast and climate
Millbrae, CA

Weather in January

January, the same as December, in Millbrae, California, is another mild winter month, with average temperature fluctuating between 56.3°F (13.5°C) and 47.5°F (8.6°C). In January, the average high-temperature is essentially the same as in December - a still moderate 56.3°F (13.5°C). Weather in January »

Weather in February

February, the last month of the winter, in Millbrae, is also a moderate month, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 57.6°F (14.2°C). In Millbrae, the average high-temperature is practically the same as in January - a still mild 57.6°F (14.2°C). Weather in February »

Weather in March

March, the first month of the spring, in Millbrae, is still a mild month, with temperature in the range of an average high of 58.8°F (14.9°C) and an average low of 48.2°F (9°C). In Millbrae, the average high-temperature in March is almost the same as in February - a still moderate 58.8°F (14.9°C). Weather in March »

Weather in April

April in Millbrae, California, is a comfortable spring month, with average temperature ranging between min 49.1°F (9.5°C) and max 61.3°F (16.3°C). In April, the average high-temperature is practically the same as in March - an enjoyable 61.3°F (16.3°C). Weather in April »

Weather in May

May, the last month of the spring, in Millbrae, is also an enjoyable month, with average temperature fluctuating between 50.5°F (10.3°C) and 63.1°F (17.3°C). In May, the average high-temperature is almost the same as in April - a still enjoyable 63.1°F (17.3°C). Weather in May »

Weather in June

The first month of the summer, June, is also an enjoyable month in Millbrae, California, with average temperature ranging between min 54°F (12.2°C) and max 67.6°F (19.8°C). In June, the average high-temperature is relatively the same as in May - a still enjoyable 67.6°F (19.8°C). Weather in June »

Weather in July

July in Millbrae, California, is an agreeable summer month, with average temperature varying between 69.6°F (20.9°C) and 55°F (12.8°C). In Millbrae, the average high-temperature in July is almost the same as in June - an agreeable 69.6°F (20.9°C). Weather in July »

Weather in August

August, the last month of the summer, in Millbrae, is another pleasant month, with average temperature varying between 69.4°F (20.8°C) and 56.5°F (13.6°C). In Millbrae, the average high-temperature is almost the same as in July - a still pleasant 69.4°F (20.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Millbrae, California, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 70.2°F (21.2°C). The warmest month is September, with an average high-temperature of 70.2°F (21.2°C) and an average low-temperature of 56.8°F (13.8°C). Weather in September »

Weather in October

October, like September, in Millbrae, California, is another enjoyable autumn month, with average temperature fluctuating between 55.6°F (13.1°C) and 67.1°F (19.5°C). In Millbrae, the average high-temperature is practically the same as in September - a comfortable 67.1°F (19.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an enjoyable month in Millbrae, California, with average temperature varying between 61.2°F (16.2°C) and 51.8°F (11°C). In November, the average high-temperature marginally drops, from 67.1°F (19.5°C) in October, to a still enjoyable 61.2°F (16.2°C). Weather in November »

Weather in December

December, the first month of the winter, in Millbrae, is also a moderate month, with average temperature varying between 55.6°F (13.1°C) and 47.8°F (8.8°C). With an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 47.8°F (8.8°C), December is the coldest month. Weather in December »
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FAQ

How many days does it rain in Millbrae?

Throughout the year, there are 81.5 rainfall days, and 12.8" (325mm) of precipitation is accumulated.

What is the wettest month in Millbrae?

February is the month with the most rainfall. Rain falls for 9 days and accumulates 2.44" (62mm) of precipitation.

What is the month with the lowest UV index in Millbrae?

February and December, with an average maximum UV index of 3, are months with the lowest UV index.

When are the longest days in Millbrae?

The month with the longest days in Millbrae is June, with an average of 14.7h of daylight.

When is the highest UV index in Millbrae?

June through September, with an average maximum UV index of 5, are months with the highest UV index in Millbrae, California.

What is the driest month in Millbrae?

July is the month with the least rainfall in Millbrae, California. Rain falls for 2.4 days and accumulates 0.08" (2mm) of precipitation.

What month has the most sunshine in Millbrae?

July has the most sunshine of the year, with an average of 11.8h of sunshine.

What is the most humid month in Millbrae?

August is the most humid month, with an average relative humidity of 78%.

What is the warmest month in Millbrae?

September is the warmest month, with an average high-temperature of 70.2°F (21.2°C) and an average low-temperature of 56.8°F (13.8°C).

What is the least humid month in Millbrae?

With an average relative humidity of 70%, October is the least humid month.

What is the coldest month in Millbrae?

December is the coldest month in Millbrae, California, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 47.8°F (8.8°C).

What is the month with the shortest days in Millbrae?

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

What is the month with the least sunshine in Millbrae?

With an average of 5.8h of sunshine, December has the least sunshine of the year.

Average temperature
Millbrae, CA

Average temperature - Millbrae, CA

The warmest month (with the highest average high temperature) is September (70.2°F).
The month with the lowest average high temperature is December (55.6°F).

The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).

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Average pressure
Millbrae, CA

Average pressure - Millbrae, 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
Millbrae, CA

Average wind speed - Millbrae, CA

The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).

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Average rainfall
Millbrae, CA

Average rainfall - Millbrae, CA

The wettest month (with the highest rainfall) is February (2.44").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days
Millbrae, CA

Average rainfall days - Millbrae, CA

The month with the highest number of rainy days is March (12.8 days).
Months with the least rainy days are June and July (2.4 days).

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Average daylight / Average sunshine
Millbrae, CA

Average daylight / Average sunshine - Millbrae, 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: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days
Millbrae, CA

Average sunshine days - Millbrae, CA

The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is March (16.3 days).

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Average UV index
Millbrae, CA

Average UV index - Millbrae, CA

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February and December (UV index 3).

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Average visibility
Millbrae, CA

Average visibility - Millbrae, 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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