San Jacinto County, Texas

What hazards hit San Jacinto County most?

The most frequent records are severe thunderstorm wind events: 88 since 1981. The rank column places the county among Texas's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has San Jacinto County had?

NOAA records 19 tornadoes in San Jacinto County from 1975 to 2013, the strongest rated F2, with 1 death and 9 injuries recorded in the county. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 21 tornadoes whose track touched San Jacinto County since 1950 (NOAA's county records number 19: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 1 person.

Map of the strongest tornado tracks in Texas.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in San Jacinto County?

The most recent record with damage, injuries or deaths is the August 26, 2017 flash flood (3 deaths and $421 million in damage in 2025 dollars).

Slow moving Tropical Storm Harvey produced very heavy rainfall and flooding over portions of San Jacinto County. Major lowland flooding occurred near the Trinity River and areas below Lake Livingston. There was a report of high water closing Marie Street in Shepherd with numerous reports of other flooded roadways around the county. Many roads and homes along the southern end of Lake Livingston were inundated. FM 3278 was inaccessible due to the inundation of flood waters. Major lowland flooding occurred on the Trinity River near Goodrich. Hundreds to thousands of homes received various levels of damage from flooding; from minor to being completely destroyed.There were 3 fatalities, all direct.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 728390)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for San Jacinto County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

Records by month in San Jacinto County. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for San Jacinto County

FEMA's register lists 32 declarations that include San Jacinto County: 23 major disasters, 8 emergencies and one fire management assistance declaration. Most were for hurricane (10) and flood (9).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has San Jacinto County had?

NOAA's Storm Events Database holds 49 flood or flash flood records for San Jacinto County from 1996 to 2024, on 40 days, with 3 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), San Jacinto County ranks 511th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $10.2 million on 491 claims filed in San Jacinto County; the most in one year was 87 in 1994. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for San Jacinto County

FEMA's National Risk Index rates San Jacinto County Relatively Low overall, with an expected annual loss of $14.1 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with San Jacinto County

1. Montgomery County 641
2. Liberty County 420
3. Polk County 364
4. Walker County 343
5. Trinity County 276
6. San Jacinto County 268

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in TexasEvery Texas tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in TexasThe state's severe thunderstorm wind events, by county, year and month
• The Texas recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in San Jacinto CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download San Jacinto County's FEMA declarations (CSV)32 rows: every declaration that named the county, for your own analysis