Weather
San Francisco, CA Weather Alert: Weekend Cooldown Oct 17-18
San Francisco, CA – A warm October stretch will give way to a noticeable weekend cooldown in San Francisco, where afternoon temperatures are expected to fall from 84 degrees Friday to just 67 Sunday.
By Natalie Rhodes · 2026-10-15T10:04:16.731Z
San Francisco, CA – A warm October stretch will give way to a noticeable weekend cooldown in San Francisco, where afternoon temperatures are expected to fall from 84 degrees Friday to just 67 Sunday. The 17 degree decline over two days will mark a significant change for residents enjoying the city's unusually warm mid October conditions. Sunshine will dominate the remainder of the workweek before cooler air settles across the city, bringing more seasonable conditions and eventually introducing a slight chance of rain early next week.
According to the National Weather Service's San Francisco Bay Area/Monterey office, temperatures in San Francisco are expected to reach approximately 82 degrees Thursday, Oct. 15, before climbing to 84 Friday, Oct. 16. Saturday remains warm with a projected high near 80, but a much more pronounced cooling trend arrives Sunday, Oct. 18, when the afternoon high is expected to reach only 67 degrees.
Weekend Brings a Significant Temperature Change Friday's projected 84 degree high will be the warmest reading in the supplied forecast, accompanied by sunny skies and generally light winds. East northeast winds around 6 mph are expected before becoming light and variable. Friday evening should remain clear, with temperatures gradually falling toward 58 degrees by early Saturday morning.
Saturday will provide another opportunity for outdoor activities before the larger temperature change takes hold. The National Weather Service expects sunny skies and a high near 80 degrees, followed by mostly clear conditions and a nighttime low around 57. Although temperatures will be slightly cooler than Friday, the city will remain relatively warm heading into Saturday evening.
By Sunday, the weather will feel noticeably different. Afternoon temperatures are expected to reach only 67 degrees, representing a 13 degree decline from Saturday and a 17 degree difference from Friday's projected peak. Sunshine is still expected, meaning the cooler weather is not accompanied by an immediate rain threat.
What the Cooling Trend Means for Residents The temperature transition could be particularly noticeable for residents traveling between neighborhoods, spending time along the waterfront or attending outdoor weekend events. Those planning activities near Ocean Beach, Golden Gate Park or the Embarcadero may want an additional layer available as temperatures decline.
For drivers using Interstate 80, U.S. Highway 101 or Interstate 280, the supplied forecast does not indicate any weather related road closures or significant travel hazards during the weekend. However, motorists and pedestrians should prepare for changing temperatures between Friday's warm conditions and Sunday's cooler afternoon.
The shift will continue Monday, when San Francisco's high is expected to fall to approximately 62 degrees. That would place daytime temperatures 22 degrees below Friday's forecast high, although the cooling unfolds gradually across several days rather than occurring in a single abrupt temperature collapse.
Rain Chances Enter the Picture Next Week The National Weather Service expects partly sunny skies Monday before temperatures recover slightly Tuesday, reaching approximately 65 degrees. A slight chance of rain enters the forecast Tuesday night and continues Wednesday, Oct. 21, when the high is expected to reach around 66 degrees.
No rainfall totals or precipitation probabilities were provided in the supplied forecast, and the potential showers remain several days away. Residents should monitor updated forecasts as the timing and likelihood of rain become clearer.
Will San Francisco's cooler weekend temperatures change your outdoor plans, or are you looking forward to a break from the warmth?
Five Day Weather Outlook Thursday 10/15: Sunny skies will bring afternoon temperatures near 82 degrees across San Francisco, with north winds of 5 to 8 mph becoming westerly during the afternoon. Clear conditions follow Thursday night, with a low around 59.
Friday 10/16: Sunshine continues as temperatures climb to approximately 84 degrees, the highest reading in the supplied forecast. East northeast winds around 6 mph become light and variable, with clear skies and a nighttime low near 58.
Saturday 10/17: Another sunny and warm afternoon is expected, with temperatures reaching around 80 degrees before the stronger weekend cooling trend arrives. Mostly clear conditions continue Saturday night, with temperatures dropping to approximately 57.
Sunday 10/18: A noticeable cooldown arrives as afternoon temperatures reach only 67 degrees, approximately 17 degrees below Friday's projected high. Sunny skies are expected during the day, followed by partly cloudy conditions and a low near 54.
Monday 10/19: Cooler weather continues across San Francisco, with partly sunny skies and an afternoon high near 62 degrees. Partly cloudy conditions are expected Monday night, with temperatures falling to approximately 54 degrees.
Extended Outlook Tuesday, Oct. 20, should bring mostly sunny skies and a high near 65 degrees, followed by partly cloudy conditions and a low around 55 Tuesday night. A slight chance of rain develops Tuesday night and continues Wednesday, Oct. 21, when temperatures are expected to reach approximately 66 degrees.