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South San Francisco city, CA

ZIP 94128 — Climate & Environment

Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.

Low Snow Area

Climate, disaster risk, air quality, and environmental safety

Environment & Risk in ZIP Code 94128

Disaster Risk (FEMA NRI)

County-linked natural hazard risk from FEMA National Risk Index — useful for comparing insurance and disaster exposure.

FEMA’s National Risk Index rates natural-hazard risk for South San Francisco city, CA as Relatively High (composite score 99.2), which is among the highest nationally. The strongest component scores on US5 are flood (98.4) and wildfire (92.0). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Overall rating
Relatively High
Risk index
99.2
Flood risk
98.4
Wildfire risk
92.0
Earthquake risk
99.7
Tornado risk
30.6
Winter weather risk
3.4
Hail risk
11.4

Climate & Weather in ZIP Code 94128

Climate normals for South San Francisco city, CA show little to no average snow and around 19.6 inches of annual precipitation. Pair that with FEMA NRI hazard context (overall rating Relatively High) when evaluating long-term housing and insurance exposure.

7-day weather forecast

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Sunrise, sunset & moon

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Monthly Temperature

30-year climate normals (avg. monthly temperature)

Climate Data
Hardiness Zone
10a
Annual Snow Days
0
Annual Precipitation
19.64 in
FEMA NRI rating
Relatively High

Climate & Environment key statistics

Climate statistics
Climate
Hardiness zone10a
Annual precip (in)19.64
Snow days0
Risk & Air Quality statistics
Risk & Air Quality
NRI ratingRelatively High
NRI risk index99.2
Flood risk (NRI)98.4
Wildfire risk (NRI)92.0