ZIP code · Atascadero · California · United States

ZIP code 93423 — Atascadero

ZIP code 93423 serves Atascadero, California.

Postal code: 93423
Single source Value from one source, not cross-checked.
City: Atascadero
County: San Luis Obispo
State: California
Country: United States
Coordinates: 35.4282, -120.7695 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 9a (20 to 25 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/Los_Angeles (UTC−8 / UTC−7 DST)
Area codes: 805, 820
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Tools: compare 93423 with another ZIP · ZIPs within 25 miles · distance from 93423

Climate — monthly normals

Warmest month Oct (avg high 73°F), coldest Dec (avg low 46°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	65	65	66	67	67	66	67	70	72	73	69	65
Avg low °F	46	48	49	49	52	54	57	57	56	54	50	46
Precip in	3.6	3.6	3.2	1.0	0.4	0.2	0.1	0.0	0.1	0.7	1.3	2.8

NOAA 1991–2020 climate normals from the nearest station: MORRO BAY FIRE DEPT (6.0 mi) · NOAA NCEI

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page