Natural hazards · Sienna

Sienna, TX natural hazards

Most of the natural-hazard damage FEMA expects in Sienna comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 36 claims here since 2016. 1 federal disaster brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Sienna?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Sienna to be higher than in 55% of U.S. communities, mostly from inland flooding and hurricanes.

Inland flooding41%Hurricanes25%Tornadoes19%Heat waves6%Cold waves5%Everything else5%

By hazard

What Sienna faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

41% of expected damage

Above average · higher than 55% of U.S. places

Recorded about 2 times a year in the area

Hurricanes

25% of expected damage

Well above average · higher than 88% of U.S. places

Recorded about once every 5 years in the area

Tornadoes

19% of expected damage

Above average · higher than 57% of U.S. places

Heat waves

6% of expected damage

Above average · higher than 66% of U.S. places

Recorded about 14 times a year in the area

Cold waves

5% of expected damage

Well above average · higher than 81% of U.S. places

Recorded about once every 2 years in the area

Lower here

HailIce stormsWinter weatherWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Sienna flood?

Every paid claim on a federal flood insurance policy in Sienna, from FEMA’s records.

36paid claims since 2016

$2.0Mpaid to owners

0homes flooded more than once

20162026

Biggest named events

Hurricane Harvey: 25 claims, $1.2M
Hurricane Beryl: 10 claims, $855K
Early summer severe storms: 1 claim, $3K

of homes in flood zones
are insured

of all homes
are insured

No community discount. Sienna isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Fort Bend County.

Disasters that hit Sienna

1 federal disaster brought FEMA money here

Disasters the President declared that paid out in Sienna itself: aid to households, or repair grants to Sienna.

Brought FEMA money into SiennaDeclared for Fort Bend County only

2024

Hurricane Beryl

4 households applied for aid $7K aid approved

Fort Bend County has had 22 natural disasters declared since 1953, most often hurricanes and floods.

Around Sienna

Sienna and the towns around it

Very lowLowModerateHighVery high

Missouri Citymostly inland floodingHigh

Arcolamostly inland floodingHigh

Siennamostly inland floodingModerate

About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.

Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Sienna covers 3 census tracts, combined by population.

Money that reached townFlood claims are matched to Sienna’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to Sienna. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across Sienna total about $8.5M a year, counting buildings, people and crops.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.