ZIP code · San Marcos · Texas · United States

ZIP code 78667 — San Marcos

ZIP code 78667 serves San Marcos, Texas.

Postal code: 78667
Single source Value from one source, not cross-checked.
City: San Marcos
County: Hays
State: Texas
Country: United States
Coordinates: 30.0544, -98.0036 — 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/Chicago (UTC−6 / UTC−5 DST)
Area codes: 512, 737
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 78667 with another ZIP · ZIPs within 25 miles · distance from 78667

Climate — monthly normals

Warmest month Aug (avg high 95°F), coldest Jan (avg low 39°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	60	65	72	79	85	91	94	95	89	80	69	61
Avg low °F	39	43	49	56	64	70	72	72	66	58	48	41
Precip in	2.6	2.1	2.9	2.6	4.3	3.7	2.1	2.1	3.6	4.0	2.9	2.7

NOAA 1991–2020 climate normals from the nearest station: DRIPPING SPRINGS 6 E (11.4 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