ZIP code · Harlingen · Texas · United States
ZIP code 78551 — Harlingen
ZIP code 78551 serves Harlingen, Texas.
- Postal code
- 78551Single source Value from one source, not cross-checked.
- City
- Harlingen
- County
- Cameron
- State
- Texas
- Country
- United States
- Coordinates
- 26.2447, -97.7206 — precision precise (locality)
View on OpenStreetMap - USDA hardiness zone
- 10a (30 to 35 °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 code
- 956Telephone 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 78551 with another ZIP · ZIPs within 25 miles · distance from 78551
Climate — monthly normals
Warmest month Aug (avg high 98°F), coldest Jan (avg low 51°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 72 | 76 | 81 | 86 | 91 | 95 | 97 | 98 | 93 | 88 | 80 | 73 |
| Avg low °F | 51 | 55 | 60 | 66 | 72 | 76 | 77 | 77 | 74 | 67 | 59 | 53 |
| Precip in | 1.2 | 1.2 | 1.5 | 2.3 | 2.7 | 2.4 | 2.4 | 2.1 | 5.8 | 3.1 | 2.0 | 1.6 |
NOAA 1991–2020 climate normals from the nearest station: HARLINGEN (4.2 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