The best times to visit San Francisco for ideal weather are
March 26th to June 3rd
August 13th to November 25th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
San Francisco Travel Guide
Other San Francisco Travel Info
Weather in San Francisco
Average temperatures in San Francisco vary greatly. Considering humidity, temperatures feel nice most of the year, excluding some hot weeks in the summer, with a fair chance of precipitation about half of the year. The area is somewhat temperate — in the 46th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit San Francisco, the hottest months are January, December, and then February. See average monthly temperatures below. The warmest time of year is generally mid January where highs are regularly around 92.2°F (33.4°C) with temperatures rarely dropping below 67.8°F (19.9°C) at night.
San Francisco Temperatures (Fahrenheit)
San Francisco Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
San Francisco Perceived Temperature (F)
San Francisco Perceived Temperature (C)
Average San Francisco Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in San Francisco are July, June, and then August. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around late July. For example, on the week of July 23rd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late January and early February with an average of 2 days of significant precipitation the week of January 29th.
When can you find snow in San Francisco? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in San Francisco.
Snow on the Ground
The graph below shows the average snow on the ground in San Francisco (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
San Francisco has some high humidity months, with other comfortably humid months. The least humid month is December (53.9% relative humidity), and the most humid month is May (68.3%).
Wind in San Francisco is usually calm. The windiest month is September, followed by August and October. September’s average wind speed of around 8.2 knots (9.4 MPH or 15.2 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid to late September where average top sustained speeds reach 15.7 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in San Francisco.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||6.2||Light breeze||13.1||Significant breeze|
|Feb||6.1||Light breeze||12.5||Significant breeze|
|Mar||5.6||Light breeze||11.6||Significant breeze|
|Apr||5.5||Light breeze||11.4||Significant breeze|
|May||6.1||Light breeze||11.8||Significant breeze|
|Jun||5.9||Light breeze||12||Significant breeze|
|Jul||6.7||Light breeze||13||Significant breeze|
|Aug||8.1||Gentle breeze||15.2||Significant breeze|
|Sep||8.2||Gentle breeze||14.6||Significant breeze|
|Oct||7.4||Gentle breeze||13.8||Significant breeze|
|Nov||7.2||Gentle breeze||13.9||Significant breeze|
|Dec||6.7||Light breeze||13.4||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to San Francisco?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for Argentina; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 24, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in San Francisco, Argentina is August, followed by October and July. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit San Francisco in February. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall San Francisco Travel Experience by Season
Fall (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 86.5°F (30.3°C) and 66.7°F (19.3°C) with colder temperatures in the later months. Rain is somewhat common with 4 to 7 days of significant precipitation per month. Fall is the second busiest for tourism, which makes it a good time for those looking for things to do.
Winter (June through August)
The middle-year months have cold weather with high temperatures that are comfortable. These months see the least precipitation with about 2 days of precipitation per month. June – August is the busiest season for tourism in San Francisco, so lodging and other accommodations may cost more than usual.
Spring (September through November)
Spring daily highs range from 86.4°F (30.2°C) and 72.5°F (22.5°C), which will feel very nice given the humidity and wind. It rains or snows a significant amount: 4 to 6 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.
Summer (December through February)
Weather is perfect this time of year in San Francisco to be enjoyable for warm weather travelers. The average high during this season is between 92.2°F (33.4°C) and 83.5°F (28.6°C). On average, it rains or snows a fair amount: 6 to 7 times per month. These times of year are the slowest with tourists.