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Weather for 78503 — Mcallen, TX

Conditions and forecast for the exact centre of ZIP code 78503 (26.177, -98.252), not a nearby airport.

70°

Mainly clear

Feels like:
70°
Humidity:
39%
Wind:
15 mph
Dew point:
44°

Source updated: 3:00:45 AM · WeatherSignal checked: 3:00:45 AM

Source: Open-Meteo (national weather-service models)

Next 12 hours in 78503

3 AM

70°

0%

4 AM

70°

0%

5 AM

69°

0%

6 AM

67°

0%

7 AM

66°

0%

8 AM

64°

0%

9 AM

63°

0%

10 AM

62°

0%

11 AM

61°

0%

12 PM

60°

0%

1 PM

60°

0%

2 PM

62°

0%

7 day forecast for 78503

  • Today

    73° / 60°

    0% rain · 17 mph wind

  • Sunday, Oct 18

    78° / 59°

    0% rain · 10 mph wind

  • Monday, Oct 19

    81° / 66°

    0% rain · 9 mph wind

  • Tuesday, Oct 20

    86° / 69°

    0% rain · 6 mph wind

  • Wednesday, Oct 21

    85° / 73°

    0% rain · 9 mph wind

  • Thursday, Oct 22

    85° / 70°

    0% rain · 6 mph wind

  • Friday, Oct 23

    85° / 67°

    0% rain · 8 mph wind

About ZIP code 78503

78503 covers Mcallen in Texas. Forecasts on this page are generated for the coordinates at the centre of the ZIP code, so small differences from a nearby city forecast are expected and usually correct.

Closest cities with full forecast pages: McAllen (2 mi), Brownsville (50 mi), Laredo (120 mi), Corpus Christi (124 mi).

Nearby ZIP codes

Severe weather warnings are issued by the National Weather Service for counties and polygons that may not line up with ZIP code boundaries. Always follow official warnings for your exact address.

Planning your week in Mcallen 78503, Texas

  • The warmest afternoon ahead is Tuesday, reaching about 86°F.
  • The coldest night ahead dips to about 59°F.
  • This is a dry stretch — most days show rain chances under 20%, good for outdoor plans.
  • The breeziest day looks like today, with sustained wind near 17 mph.
  • UV reaches 8 on the sunniest day — sunscreen is worth it if you will be outside around midday.

Common questions about Mcallen 78503, Texas weather

How accurate is the Mcallen 78503, Texas forecast?
The next 48 hours are usually reliable on temperature and sky cover, with timing that can shift by an hour or two. Days three and four are dependable for the overall pattern. Beyond that, treat the numbers as a planning direction rather than a promise — we label confidence on every day so you can judge for yourself.
What is the best day this week in Mcallen 78503, Texas?
No day in the current outlook has a rain chance above 40%, so conditions look favorable for outdoor plans across the week.
Where does this forecast come from?
Forecast values come from national weather model data, and official warnings come from the National Weather Service. We show the source and the last-updated time on every page, and we never invent a number the source did not publish — missing measurements are hidden, not guessed.
How often is this page updated?
The forecast refreshes whenever the source model publishes new data, typically several times a day. The freshness note near the top of the page shows exactly when the numbers you are looking at were issued.

More weather for Mcallen 78503, Texas

Weather in nearby cities

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