Natural hazards · Sunnyvale

Sunnyvale, TX natural hazards

Most of the natural-hazard damage FEMA expects in Sunnyvale comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 6 claims here since 1991. 2 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Sunnyvale?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Sunnyvale to be higher than in 53% of U.S. communities, mostly from inland flooding and heat waves.

Inland flooding40%Heat waves22%Hail15%Tornadoes12%Cold waves8%Everything else2%

By hazard

What Sunnyvale faces

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

Inland flooding

40% of expected damage

Above average · higher than 50% of U.S. places

Recorded about 5 times a year in the area

Heat waves

22% of expected damage

Below average · higher than 46% of U.S. places

Recorded about 19 times a year in the area

Hail

15% of expected damage

Well above average · higher than 97% of U.S. places

Recorded about 9 times a year in the area

Tornadoes

12% of expected damage

Well above average · higher than 94% of U.S. places

Recorded about once every 92 years in the area

Cold waves

8% of expected damage

Well above average · higher than 79% of U.S. places

Recorded about once a year in the area

Lower here

HurricanesIce 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 Sunnyvale flood?

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

6paid claims since 1991

$97Kpaid to owners

0homes flooded more than once

19912026

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Dallas County.

What’s been done with FEMA grants

5storm safe rooms built

Disasters that hit Sunnyvale

2 federal disasters brought FEMA money here

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

Brought FEMA money into SunnyvaleDeclared for Dallas County only

2024

Severe Storms, Straight-Line Winds, Tornadoes, and Flooding

62 households applied for aid $46K aid approved $269K to the Town of Sunnyvale for repairs

2021

Severe Winter Storms

99 households applied for aid $25K aid approved

Dallas County has had 23 natural disasters declared since 1953, most often hurricanes and severe storms.

Around Sunnyvale

Sunnyvale and the towns around it

Very lowLowModerateHighVery high

Garlandmostly heat wavesModerate

Sunnyvalemostly inland floodingModerate

Dallasmostly inland floodingModerate

Mesquitemostly heat wavesModerate

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. Sunnyvale covers 2 census tracts, combined by population.

Money that reached townFlood claims are matched to Sunnyvale’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Sunnyvale. 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 Sunnyvale total about $4.7M 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.