Climate and monthly weather forecast
San Francisco, CA

A beautiful dusk view of the Golden Gate Bridge in San Francisco, California
A beautiful dusk view of the Golden Gate Bridge in San Francisco, California

Weather in January

January, the same as December, in San Francisco, California, is another mild winter month, with average temperature ranging between min 45.9°F (7.7°C) and max 56.3°F (13.5°C). In San Francisco, California, the average high-temperature in January 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 San Francisco, is also a moderate month, with temperature in the range of an average low of 46.2°F (7.9°C) and an average high of 57.9°F (14.4°C). In February, the average high-temperature is essentially the same as in January - a still moderate 57.9°F (14.4°C). Weather in February »

Weather in March

The first month of the spring, March, is also a moderate month in San Francisco, California, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 60.1°F (15.6°C). In March, the average high-temperature is essentially the same as in February - a still moderate 60.1°F (15.6°C). Weather in March »

Weather in April

April is an enjoyable spring month in San Francisco, California, with average temperature fluctuating between 48.6°F (9.2°C) and 63.1°F (17.3°C). In April, the average high-temperature is almost the same as in March - an enjoyable 63.1°F (17.3°C). Weather in April »

Weather in May

The last month of the spring, May, is also an enjoyable month in San Francisco, California, with average temperature varying between 65.7°F (18.7°C) and 50.5°F (10.3°C). In May, the average high-temperature is almost the same as in April - a still enjoyable 65.7°F (18.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in San Francisco, California, with average temperature ranging between min 53.8°F (12.1°C) and max 70.5°F (21.4°C). In June, the average high-temperature is practically the same as in May - an agreeable 70.5°F (21.4°C). Weather in June »

Weather in July

July, the same as June, in San Francisco, California, is an agreeable summer month, with average temperature fluctuating between 72.1°F (22.3°C) and 55°F (12.8°C). In San Francisco, the average high-temperature is essentially the same as in June - a still agreeable 72.1°F (22.3°C). Weather in July »

Weather in August

August, the last month of the summer, in San Francisco, is another pleasant month, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 56.3°F (13.5°C). In San Francisco, California, the average high-temperature in August is practically the same as in July - a still pleasant 72.5°F (22.5°C). Weather in August »

Weather in September

September, the first month of the autumn, in San Francisco, is still a pleasant month, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 73.2°F (22.9°C). September is the warmest month, with an average high-temperature of 73.2°F (22.9°C) and an average low-temperature of 56.7°F (13.7°C). Weather in September »

Weather in October

October, like September, is an agreeable autumn month in San Francisco, California, with average temperature fluctuating between 55°F (12.8°C) and 68.9°F (20.5°C). In San Francisco, the average high-temperature in October is almost the same as in September - a still agreeable 68.9°F (20.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is another comfortable month in San Francisco, California, with average temperature fluctuating between 50°F (10°C) and 61.7°F (16.5°C). In November, the average high-temperature slightly decreases, from an agreeable 68.9°F (20.5°C) in October, to a comfortable 61.7°F (16.5°C). Weather in November »

Weather in December

December, the first month of the winter, in San Francisco, is still a mild month, with average temperature ranging between min 45.9°F (7.7°C) and max 55.8°F (13.2°C). The coldest month is December, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 45.9°F (7.7°C). Weather in December »
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FAQ

How many days does it rain in San Francisco?

Throughout the year, in San Francisco, California, there are 58.6 rainfall days, and 6.46" (164mm) of precipitation is accumulated.

When is the lowest UV index in San Francisco?

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

What is the wettest month in San Francisco?

The month with the most rainfall is February when the rain falls for 6 days and typically aggregates up to 1.38" (35mm) of precipitation.

What is the most humid month in San Francisco?

With an average relative humidity of 76%, March is the most humid month in San Francisco, California.

When is the ocean coldest in San Francisco?

April through June, with an average ocean temperature of 53.1°F (11.7°C), are months with the coldest seawater.

What is the month with the highest UV index in San Francisco?

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

When are the longest days in San Francisco?

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

What is the driest month in San Francisco?

July through September are months with the least rain when the rain falls for 2.3 days and typically aggregates up to 0.08" (2mm) of rain.

What month has the most sunshine in San Francisco?

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

What is the warmest month in San Francisco?

The warmest month is September, with an average high-temperature of 73.2°F (22.9°C) and an average low-temperature of 56.7°F (13.7°C).

When is the ocean warmest in San Francisco?

September is the month with the warmest seawater in San Francisco, with an average ocean temperature of 57.4°F (14.1°C).

What is the least humid month in San Francisco?

October is the least humid month in San Francisco, California, with an average relative humidity of 67%.

What is the coldest month in San Francisco?

The coldest month in San Francisco is December, with an average high-temperature of 55.8°F (13.2°C) and an average low-temperature of 45.9°F (7.7°C).

What is the month with the shortest days in San Francisco?

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

What is the month with the least sunshine in San Francisco?

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

Average temperature
San Francisco, CA

Average temperature - San Francisco, CA

The warmest month (with the highest average high temperature) is September (73.2°F).
The month with the lowest average high temperature is December (55.8°F).

The month with the highest average low temperature is September (56.7°F).
The coldest months (with the lowest average low temperature) are January and December (45.9°F).

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Average pressure
San Francisco, CA

Average pressure - San Francisco, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed
San Francisco, CA

Average wind speed - San Francisco, CA

The windiest month (with the highest average wind speed) is May (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.5mph).

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Average humidity
San Francisco, CA

Average humidity - San Francisco, CA

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (67%).

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Average rainfall
San Francisco, CA

Average rainfall - San Francisco, CA

The wettest month (with the highest rainfall) is February (1.38").
The driest months (with the least rainfall) are July, August and September (0.08").

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Average rainfall days
San Francisco, CA

Average rainfall days - San Francisco, CA

The month with the highest number of rainy days is March (9.3 days).
The month with the least rainy days is June (1.9 days).

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Average sea temperature
San Francisco, CA

Average sea temperature - San Francisco, CA

The best month for swimming (with the highest average sea temperature) is September (57.3°F).
The coldest months (with the lowest average sea temperature) are April and June (53°F).

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Average daylight / Average sunshine
San Francisco, CA

Average daylight / Average sunshine - San Francisco, 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
San Francisco, CA

Average sunshine days - San Francisco, CA

The month with the most sunshine days is October (25.8 days).
The month with the least sunshine days is March (20.8 days).

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Average UV index
San Francisco, CA

Average UV index - San Francisco, CA

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

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Average visibility
San Francisco, CA

Average visibility - San Francisco, 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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