Thanksgiving in San Francisco and the Bay Area is one of the more agreeable holiday weather experiences in the country, largely because it arrives at a climatically stable time of year. Late November sits in the transition from the Bay Area's brief warm fall period into the wet season, and the result is a range of possible conditions: clear and cool with temperatures in the mid-50s to low 60s, or wet with a November storm system moving through. The one thing Thanksgiving in the Bay Area almost never is: severely cold. Freezing temperatures on Thanksgiving Day in San Francisco are essentially unknown, and even the rainiest Thanksgiving is a mild, temperate affair compared to what most of the country experiences in late November.
Typical Thanksgiving Temperatures
San Francisco's average high temperature in late November is in the low to mid-50s Fahrenheit, with average lows in the mid-40s. Actual Thanksgiving Day temperatures vary: warm years can see highs reach 60 to 65 degrees under clear skies, while stormy years bring highs in the upper 40s with rain. The fog that dominates summer is largely absent by late November. The marine layer is thin or nonexistent and the North Pacific High has weakened enough that the classic summer pattern of persistent coastal fog is not the norm.
What replaces summer fog in late November is the possibility of winter rain. The Bay Area wet season typically begins in October and November, and by Thanksgiving the storm track has usually shifted southward enough to deliver occasional rain events from the North Pacific. A Thanksgiving Day with steady rain and temperatures in the low 50s is a normal possibility, not an anomaly. Clear and cold Thanksgivings are equally possible. The holiday falls right in the transition zone between the dry season and the reliably wet period of December through February.
Inland Bay Area on Thanksgiving
The inland East Bay and South Bay experience similar Thanksgiving weather patterns but with their own variation. The temperature gradient that makes the inland valleys 15 to 25 degrees hotter than San Francisco in summer has diminished by late November. The marine layer is not the dominant forcing mechanism, and inland daytime highs are typically 5 to 10 degrees above San Francisco rather than 25 to 35 degrees above. A Thanksgiving Day with San Francisco at 56 degrees and Oakland at 60 degrees is typical. Livermore or Walnut Creek might reach 62 on a clear day.
Overnight temperatures in the inland valleys drop significantly below coastal temperatures in late November. Clear Thanksgiving nights see the inland areas cool to the upper 30s or low 40s through radiative cooling, while San Francisco stays in the upper 40s due to the bay's thermal mass. Frost is possible in the inland valleys on cold clear nights after Thanksgiving. In wine country, November frosts are expected and are part of the agricultural calendar. Growers have already harvested by then and the vines are going dormant.
Rain Probability and the Wet Season Start
Roughly one in three Thanksgiving weekends in the Bay Area sees measurable rain, with the probability higher in El Niño years when the jet stream is positioned favorably for California storm systems. Rain on Thanksgiving is not typically the heavy atmospheric river type that dominates January and February. November storms are often lighter, passing through in 12 to 24 hours rather than the multi-day events of peak wet season. A Thanksgiving rain that clears by Friday afternoon, leaving a washed-clean sky and cool, clear weather for the rest of the weekend, is a common pattern.
For travel purposes, Thanksgiving week is one of the busiest travel periods at SFO and OAK, but the weather delays that characterize summer mornings are much less common in late November. Winter storm systems can occasionally cause wind and turbulence issues, but the persistent morning fog ground delay programs that affect the airports in June through August are not a significant factor in November. The biggest Thanksgiving travel disruption in the Bay Area typically comes from the sheer volume of traffic rather than the weather.
Best Thanksgiving Activities in the Bay Area
Clear Thanksgiving days in the Bay Area are excellent for outdoor activities. The low angle of the November sun creates beautiful long-shadow light in the late afternoon, the crowds at popular parks and hiking trails are smaller than summer, and the air is clear after any recent rain has washed the atmosphere. The Marin Headlands, the East Bay hills, and the coastal parks south of San Francisco are all particularly appealing on clear late-November days when the grass is starting to turn green with the first rains and the views are at their sharpest. Even Thanksgiving Day with light rain has its appeal. Hiking in a cool drizzle through the redwoods is a distinct and worthwhile Bay Area experience.