No freeze warning for San Francisco right now
Freeze Warning in San Francisco, CA? Protect Your Pipes Tonight
When a freeze reaches San Francisco, the pipes most at risk run through exterior walls, crawl spaces, attics and garages. Let those faucets drip, open the cabinet doors under sinks on outside walls, keep the heat at 55°F or higher and find your main shut-off now. If a pipe has already burst, shut the main and call (888) 840-6512: the line is answered 24/7 and reaches an IICRC-certified restoration company covering your ZIP, which gives you an arrival window for your address on the call. Most water damage jobs in San Francisco run $4,500–$38,000.
Press 1 for water damage or 2 for mold, then your 5-digit ZIP. The line goes quiet for about half a minute while it connects — that is normal, stay on. If it does not connect, call once more: companies taking calls change minute to minute.
Live status checked Nov 4, 11:18 PM ET · Source: National Weather Service, forecast zone CAZ006
San Francisco freeze status
No freeze, hard freeze or extreme cold alert covers San Francisco at the moment. The first hard freezes usually reach the northern states in late October and the South between December and February. This page updates on its own when the Weather Service issues one, and the official San Francisco forecast shows the overnight lows.
How often San Francisco gets cold enough to freeze pipes
In NOAA’s 1991–2020 normals for the nearest weather station, San Francisco averages 0.0 nights a year at or below 32°F and 0.0 at or below 20°F, the temperature at which pipes in unheated spaces start to freeze. A 20°F night does not come in a typical year, which is when unprotected pipes are most exposed. Compare San Francisco with 500 other U.S. cities.
San Francisco's weather and your pipes
San Francisco faces an unusual water damage profile: the city averages 22 inches of rain annually, but atmospheric river events (Pineapple Express storms) can dump 5—10 inches in 24 hours. The 2022—2023 atmospheric river season caused hundreds of millions in damage across SF. Victorian and Edwardian buildings (1880s—1910s) have galvanized steel pipes that have exceeded their 70-year lifespan. Flat-roof Victorians on the west side accumulate standing water during storms. Fog condensation contributes to chronic moisture intrusion in older building envelopes.
Before, during and after a freeze in San Francisco
1. Before it gets cold
Disconnect garden hoses, shut and drain outdoor spigots if you have an inside valve, and walk to your main shut-off so you can find it in the dark.
2. The night of the freeze
Let faucets on exterior walls drip, open the cabinet doors under those sinks, keep the thermostat at 55°F or higher even if you are away, and keep the garage door closed.
3. If a pipe freezes
Leave the faucet open and warm the pipe from the faucet end with a hair dryer or heating pad, never an open flame. If water does not return, look for a split before it thaws.
4. If a pipe bursts
Close the main shut-off, switch off power to wet rooms at the breaker, photograph everything, then get the water out and the structure dried before mold starts in 24 to 48 hours.
More for San Francisco
San Francisco County, California
San Francisco freeze questions
Is there a freeze warning in San Francisco tonight?
Not as of Nov 4, 11:18 PM ET. This page reads the National Weather Service feed for San Francisco's forecast zone every 30 minutes and changes the moment a freeze, hard freeze or extreme cold alert is issued.
At what temperature do pipes freeze in San Francisco?
Uninsulated pipes in unheated spaces are at risk once the air around them stays at or below about 20°F for several hours. In San Francisco, as anywhere, the pipes that freeze first run through exterior walls, crawl spaces, attics and garages. A pipe usually splits while frozen and floods when it thaws.
What should I do if a pipe bursts in San Francisco?
Shut off the main water valve, open the lowest faucet to drain the lines, turn off power to any wet room at the breaker panel, and photograph the damage. Then get the water out and the walls and floor dried with moisture meters: drywall, insulation and framing left wet for 24 to 48 hours are where mold starts.
Who do I call right now for water damage?
Call (888) 840-6512. The line is answered 24 hours a day, seven days a week, and connects you with an IICRC-certified water damage restoration company that serves your area. A recorded menu picks up first: choose water damage or mold, key in your 5-digit ZIP code, and hold through the short silence while the call is passed to the company.
Describe what you can see — where the water is coming from, how long it has been there, and whether it smells — the more specific you are, the faster the right company is on the line. If the source is a pipe or an appliance, shut the main water valve first. Have four things ready and the call goes quickly: the address, when the water started, what is wet now, and whether you have filed an insurance claim.
Still not sure which of these is your situation? (888) 840-6512 · toll-free · answered 24/7