Address reportCitiesHawaii › Honolulu

Honolulu, HI

Earthquake hazard, typical weather and growing season from public federal data. Population 347,884.

Flood zone: it depends on the exact parcel

There is no such thing as a flood zone for a whole city. Two houses on the same street can sit in different zones, and it is the single fact here that changes most over a short distance. So this page does not guess one.

Look up a specific Honolulu address →

Earthquake hazard high

Design category D

High seismic hazard. Strong ground shaking is expected over the life of a building. Substantial seismic-resistant design, detailing, and inspection are required by code. The ASCE 7 Seismic Design Category here is D. (Short-period design value Ss ≈ 0.577 g — the standard headline measure of ground-shaking hazard.)

USGS Seismic Design Web Services (ASCE 7), assuming Site Class D — stiff or unknown soil. Real soil conditions can move the category either way.

Typical weather

80.8° in September, 63.1° in January

Thirty-year averages, not a forecast. Any individual year can differ substantially.

MonthHighLowRainSnow
Jan76°63.1°10.64"0"
Feb75.9°63.3°9.14"0"
Mar75.7°63.9°13.74"0"
Apr76°65.4°12.91"0"
May77.7°66.8°9.32"0"
Jun78.1°68.4°12.87"0"
Jul79°69.7°15.35"0"
Aug80.1°70.2°12.66"0"
Sep80.8°70°12.19"0"
Oct80.1°69.2°12.89"0"
Nov78°67.6°15.08"0"
Dec76.4°65.4°14.17"0"

NOAA/NCEI 1991–2020 U.S. Climate Normals — station MANOA LYON ARBO 785.2, HI US, 3 mi away.

Growing season zone 12b

The hardiness zone below is ZIP-level and stands on its own, but the frost dates come from KANALOHULUHULU 1075, HI US about 129.3 miles away — too far to state as this city's, so they are omitted.

2023 USDA Plant Hardiness Zone Map and NOAA/NCEI 1991–2020 frost normals.

What this page does not tell you

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