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Mercedes, TX 78570 Weather

Tonight: Partly Cloudy, low 69°F. Hourly and 10-day forecast from the National Weather Service. Times are local (CDT).

Mercedes, TX 78570 current weather

82°F

Mostly Cloudy

Forecast for this hour. No recent report from a nearby station.

H -- / L 69°

  • No rain expected in the next 12 hours

No recent station report. NWS hourly forecast updated 10/29/2026, 4:24 PM PT

Hourly forecast

NWS, updated 10/29/2026, 4:24 PM PT

  1. Now82°
  2. 7 PM80°
  3. 8 PM77°
  4. 9 PM76°
  5. 10 PM75°
  6. 11 PM74°
  7. 12 AM73°Fri
  8. 1 AM72°
  9. 2 AM72°
  10. 3 AM71°
  11. 4 AM70°
  12. 5 AM70°
  13. 6 AM69°
  14. 7 AM70°
  15. 8 AM70°
  16. 9 AM73°
  17. 10 AM79°
  18. 11 AM82°
  19. 12 PM85°
  20. 1 PM87°
  21. 2 PM88°
  22. 3 PM89°
  23. 4 PM89°
  24. 5 PM88°
  25. 6 PM87°
  26. 7 PM84°
  27. 8 PM80°
  28. 9 PM78°
  29. 10 PM77°
  30. 11 PM76°
  31. 12 AM75°Sat
  32. 1 AM74°
  33. 2 AM73°
  34. 3 AM73°
  35. 4 AM72°
  36. 5 AM71°
  37. 6 AM71°
  38. 7 AM70°
  39. 8 AM71°
  40. 9 AM75°
  41. 10 AM80°
  42. 11 AM84°
  43. 12 PM86°
  44. 1 PM88°
  45. 2 PM90°
  46. 3 PM91°
  47. 4 PM91°
  48. 5 PM90°

10-day forecast

Tap a day for details

  • Today10/29Low 69°High

    Tonight: Partly cloudy, with a low around 69. East southeast wind 5 to 14 mph, with gusts as high as 23 mph.

    Partly Cloudy
  • Fri10/30Low 70°High 90°

    Friday: Mostly sunny, with a high near 90. East southeast wind 5 to 12 mph, with gusts as high as 21 mph.

    Friday Night: Mostly clear, with a low around 70. Southeast wind 2 to 12 mph.

    Mostly Sunny
  • Sat10/31Low 71°High 91°

    Saturday: Mostly sunny, with a high near 91. East southeast wind 1 to 9 mph.

    Saturday Night: Mostly clear, with a low around 71. East wind 2 to 12 mph.

    Mostly Sunny
  • Sun11/1Low 72°High 91°

    Sunday: Mostly sunny. High near 91, with temperatures falling to around 87 in the afternoon. East wind 2 to 13 mph, with gusts as high as 21 mph.

    Sunday Night: Partly cloudy, with a low around 72. East southeast wind 5 to 13 mph, with gusts as high as 21 mph.

    Mostly Sunny
  • Mon11/2Low 73°High 92°

    Monday: Mostly sunny, with a high near 92. Southeast wind 6 to 16 mph, with gusts as high as 26 mph.

    Monday Night: Mostly clear, with a low around 73. South southeast wind 12 to 16 mph, with gusts as high as 26 mph.

    Mostly Sunny
  • Tue11/313% chance of precipitationLow 68°High 90°

    Tuesday: Mostly sunny, with a high near 90. Southeast wind 12 to 15 mph, with gusts as high as 29 mph.

    Tuesday Night: Mostly clear, with a low around 68. North northeast wind 5 to 13 mph, with gusts as high as 22 mph.

    Mostly Sunny
  • Wed11/4Low 64°High 86°

    Wednesday: Sunny, with a high near 86.

    Wednesday Night: Mostly clear, with a low around 64.

    Sunny
  • Thu11/5Low High 85°

    Thursday: Sunny, with a high near 85.

    Sunny
  • Fri11/6Model blendLow 68°High 86°

    Friday: Mostly sunny. High near 86°. Low that night near 68°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sat11/7Model blend27% chance of precipitationLow 69°High 86°

    Saturday: Partly cloudy, slight chance of rain. High near 86°. Low that night near 69°. About 0.02 in of precipitation.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 26.169, -97.906 from the NWS BRO office, updated 10/29/2026, 4:24 PM PT · Official forecast on weather.gov

Days 9 to 10: NOAA National Blend of Models, station KTXW (Weslaco/Mid Valley Arpt, 4 mi), model run 10/29/2026, 3:00 PM CDT

Forecaster's discussionIssued 10/29/2026, 12:30 PM CDT

: New DISCUSSION, AVIATION, MARINE:

Key messages

Updated at 1217 PM CDT Thu Oct 29 2026

- Highest rain chances across the brush country today with drier conditions expected this weekend into early next week.

- Above normal temperatures are expected by this weekend, with a cold front expected to bring cooler temperatures late Tuesday.

- A Coastal Flood Statement is in effect until 7 AM Friday for the Lower Texas Coast beaches and may need to be extended into Sunday.

Discussion

Issued at 1217 PM CDT Thu Oct 29 2026

Abundant tropical moisture continues to work into Texas from the west, with showers just edging into Zapata County. Expect the heaviest activity to remain generally north of the CWA, with a few showers sneaking into Jim Hogg and Starr counties. An isolated sea breeze shower or two may develop across the RGV this afternoon. Above normal temperatures and drier conditions arrive by Friday, maintain a very warm Halloween weekend, and continue into early next week. A potent low pressure system swings through the Southern Plans Monday into Tuesday, kicking up a warm and breezy Monday before sending a cold front through Deep South Texas on Tuesday with cooler temperatures into Wednesday.

Persistent easterly flow across the Gulf and elevated astronomical tides continue to narrow beaches during high tide cycles into the weekend. Coastal Flood Statements may need to be extended into Sunday morning. Expect elevated rip currents into the weekend as well with the easterly long-period swell.

Aviation

(18Z TAFS) Issued at 1217 PM CDT Thu Oct 29 2026

VFR conditions are expected to generally prevail through the TAF period with a southeasterly breeze this afternoon and again Friday afternoon and a low to medium chance of a passing shower or two mid-afternoon near MFE. Brief MVFR ceilings are possible in any heavier shower.

Marine

Issued at 1217 PM CDT Thu Oct 29 2026

Persistent long-period easterly swell continues along the western Gulf waters with generally favorable marine conditions and low to moderate seas. As the pressure gradient strengthens early next week, winds across the bay may approach Small Craft Caution conditions. A cold front arrives on Tuesday with SCEC conditions possible into mid next week.

Preliminary point temps/pops

BROWNSVILLE 71 88 73 89 / 0 10 0 0 HARLINGEN 68 89 70 90 / 0 10 0 10 MCALLEN 72 92 72 94 / 10 0 0 0 RIO GRANDE CITY 69 90 70 93 / 10 10 0 0 SOUTH PADRE ISLAND 74 82 75 82 / 0 10 0 0 BAYVIEW/PORT ISABEL 70 86 71 86 / 0 10 0 10

Watches, warnings and advisories

TX: None. GM: None.

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now82°Mostly Cloudy5%14 mph
  2. 7 PM80°Mostly Cloudy3%13 mph
  3. 8 PM77°Mostly Cloudy3%10 mph
  4. 9 PM76°Mostly Cloudy4%8 mph
  5. 10 PM75°Partly Cloudy3%7 mph
  6. 11 PM74°Partly Cloudy3%7 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

Will it rain in Mercedes, TX 78570 in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What is the 10-day forecast for Mercedes, TX 78570?
The first 8 days come from the National Weather Service forecast. Days 9 to 10 (Nov 6 to Nov 7) come from the NOAA National Blend of Models, with highs near 86°F. Model guidance this far out often changes.
What time is sunrise and sunset in Mercedes, TX 78570 today?
Sunrise is about 7:38 AM CDT and sunset is about 6:51 PM CDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Mercedes, TX 78570?
At Weslaco, the 1991 to 2020 normal high in October is 87°F and the normal low is 66°F.

Nearby hazards

Texas hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

UV and air quality forecast

EPA and AirNow

AQI forecast today (Brownsville-McAllen)
GoodPM2.5
AQI forecast tomorrow (Brownsville-McAllen)
GoodPM2.5

UV index guide · Air quality

Drought

By county

Hidalgo County, week of 10/27/2026

100% of the county is in moderate drought or worse.

Sun and moon

Local time, center of the area

Sunrise
7:38 AM
Sunset
6:51 PM
Daylight
11 hr 13 min
Moon
Waning Gibbous 84% lit
First light (civil dawn)
7:15 AM
Last light (civil dusk)
7:15 PM
Moonrise
9:50 PM
Moonset
11:25 AM

Normal October weather

Climate

Normal October high 87°, low 66°, precipitation 2.84 in for the month. 1991 to 2020 normals at Weslaco, 4 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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