Monthly weather forecast and climate
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
January, the same as December, in San Francisco, California, is a moderate winter month, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 45.9°F (7.7°C). In January, the average high-temperature is relatively the same as in December - a still mild 56.3°F (13.5°C). Weather in January »

February, the last month of the winter, in San Francisco, is also a moderate month, with average temperature varying between 57.9°F (14.4°C) and 46.2°F (7.9°C). In February, the average high-temperature is relatively the same as in January - a still mild 57.9°F (14.4°C). Weather in February »

March, the first month of the spring, in San Francisco, is also a moderate month, 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 relatively the same as in February - a still moderate 60.1°F (15.6°C). Weather in March »

April is a comfortable spring month in San Francisco, California, with temperature in the range of an average low of 48.6°F (9.2°C) and an average high of 63.1°F (17.3°C). In April, the average high-temperature is essentially the same as in March - an enjoyable 63.1°F (17.3°C). Weather in April »

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

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 almost the same as in May - a pleasant 70.5°F (21.4°C). Weather in June »

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

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

The first month of the autumn, September, is also an agreeable month in San Francisco, California, with average temperature ranging between max 73.2°F (22.9°C) and min 56.7°F (13.7°C). With an average high-temperature of 73.2°F (22.9°C) and an average low-temperature of 56.7°F (13.7°C), September is the warmest month. Weather in September »

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

November, the last month of the autumn, in San Francisco, is also an enjoyable month, with average temperature varying between 61.7°F (16.5°C) and 50°F (10°C). In November, the average high-temperature marginally drops, from a pleasant 68.9°F (20.5°C) in October, to a comfortable 61.7°F (16.5°C). Weather in November »

December, the first month of the winter, in San Francisco, is also a moderate month, with average temperature varying between 45.9°F (7.7°C) and 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 »

How much does it rain in San Francisco?

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

When is the lowest UV index in San Francisco?

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

What is the wettest month in San Francisco?

February is the month with the most rainfall. Rain falls for 6 days and accumulates 1.38" (35mm) of precipitation.

What is the most humid month in San Francisco?

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

What are the months with the coldest ocean 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.

When are the longest days in San Francisco?

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

What is the driest month in San Francisco?

July through September are months with the least rain in San Francisco, California, 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, 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).

What is the month with the warmest ocean in San Francisco?

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

What is the least humid month in San Francisco?

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

What is the coldest month in San Francisco?

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

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

December has the shortest days of the year in San Francisco, with an average of 9.6h of daylight.

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

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

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").

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).

Average humidity - 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").

Average rainfall days - 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).

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).

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).

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).

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).