ZIP code · La Mesa · California · United States

ZIP code 91944 — La Mesa

ZIP code 91944 serves La Mesa, California.

Postal code: 91944
Single source Value from one source, not cross-checked.
City: La Mesa
County: San Diego
State: California
Country: United States
Coordinates: 32.7678, -117.0231 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 10b (35 to 40 °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: 619, 858
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 91944 with another ZIP · ZIPs within 25 miles · distance from 91944

Climate — monthly normals

Warmest month Aug (avg high 89°F), coldest Dec (avg low 42°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	69	69	71	75	76	81	86	89	87	81	75	69
Avg low °F	43	44	48	51	56	59	63	65	62	56	47	42
Precip in	2.3	2.6	1.9	0.8	0.3	0.1	0.2	0.0	0.1	0.5	1.0	1.8

NOAA 1991–2020 climate normals from the nearest station: EL CAJON (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