San Joaquin County weather alerts
There are no active weather alerts for San Joaquin County, CA right now.
Since 2016 the National Weather Service has issued about 999 alerts that included San Joaquin County, roughly 100 a year. The most common is the dense fog advisory (338 from 2016 to 2025). The last tornado warning was issued on April 10, 2026. 19 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include San Joaquin County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Amador County, Stanislaus County, Calaveras County, Contra Costa County.
San Joaquin County alert history
Alert events that included San Joaquin County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Dense Fog Advisory | 338 | 55 | November 6, 2026 |
| Wind Advisory | 198 | 7 | November 13, 2026 |
| Heat Advisory | 71 | 11 | October 3, 2026 |
| Freeze Warning | 60 | 4 | February 20, 2026 |
| Extreme Heat Watch | 54 | 0 | August 21, 2025 |
| Flood Advisory | 51 | 7 | November 12, 2026 |
| Flood Watch | 47 | 0 | December 24, 2025 |
| Freeze Watch | 46 | 1 | February 20, 2026 |
| Extreme Heat Warning | 44 | 1 | July 30, 2026 |
| Flood Warning | 31 | 0 | March 17, 2023 |
| High Wind Watch | 14 | 0 | December 24, 2025 |
| Frost Advisory | 13 | 0 | December 29, 2025 |
| High Wind Warning | 13 | 0 | December 24, 2025 |
| Severe Thunderstorm Warning | 4 | 8 | April 11, 2026 |
| Tornado Warning | 4 | 1 | April 10, 2026 |
| Red Flag Warning | 4 | 2 | May 16, 2026 |
| Fire Weather Watch | 3 | 2 | May 16, 2026 |
| Winter Weather Advisory | 2 | 0 | February 9, 2019 |
| Flash Flood Warning | 1 | 0 | February 21, 2017 |
| Winter Storm Warning | 1 | 0 | February 21, 2023 |
Tornado history in San Joaquin County
19 tornadoes have been recorded in San Joaquin County since 1950. That ranks 7 of 58 counties in California. The most recent was on April 21, 2022 (rated unknown).
Strongest tornadoes in San Joaquin County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| March 31, 1978 | F1 | San Joaquin County | 0.5 mi | 10 yd | 0 | 0 |
| April 19, 1988 | F1 | San Joaquin County | 0.2 mi | 23 yd | 0 | 0 |
| May 31, 1967 | F1 | San Joaquin County | 0.1 mi | 100 yd | 0 | 0 |
| April 27, 1970 | F0 | San Joaquin County | 1.5 mi | 50 yd | 0 | 0 |
| April 8, 2005 | F0 | San Joaquin County | 1.5 mi | 0 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 21, 2022 | ? | San Joaquin County | 0 mi | 16 yd | 0 | 0 |
| April 11, 2012 | EF0 | San Joaquin County | 0.3 mi | 5 yd | 0 | 0 |
| December 26, 2005 | F0 | San Joaquin County | 0.3 mi | 0 yd | 0 | 0 |
| April 8, 2005 | F0 | San Joaquin County | 1.5 mi | 0 yd | 0 | 0 |
| March 28, 1998 | F0 | San Joaquin County | 0.1 mi | 30 yd | 0 | 0 |
About San Joaquin County
- Population: 816,108 (2024 estimate)
- State: California
- NOAA Weather Radio SAME code: 006077 (how to use it)
- Cities: Stockton, Tracy