Observed 3:35 AM CDT at KTXW

Mercedes, TX weather

Clear and 67°19°.

Mostly agree

Now 67°19°

Clear

Wind: Calm; Gusts to 21 mph34 km/h around 4 PM
Dew point: 64°18°; Sticky
Humidity: 92%; Air 67°19°, dew point 64°18° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 5
Air quality: 39Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.07 inHg1018 hPa; Falling slowly · −0.02 inHg−0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

5°3° cooler than this time yesterday (71°22° then, 67°19° now)

Good hours for

Low 69°21° today at 6 AM
Above 80°27° today by 11 AM
Feels like 90°32°+ today 1–4 PM (peak 91°33°)
High 87°31° today at 2 PM
Below 80°27° tonight after 8 PM

TonightNear 70°21° · Clear
This morningUp to 82°28° by 11 AM · rain chance 10% · Partly cloudy
This afternoonNear 85°29° · rain chance 20% · feels like 91°33° · Partly cloudy
TonightDown to 71°22° by 4 AM · Mostly cloudy
Tomorrow morningUp to 82°28° by 11 AM · Cloudy
Tomorrow afternoonNear 84°29° · Cloudy
Tomorrow nightDown to 70°21° by 2 AM · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 4a	Clear	70°21° (likely 67°19° to 71°22°)	70°21°	0%	5 mph8 km/h from ESE, gusts 6 mph10 km/h	86%	18%	0
Sat 5a	Mostly clear	70°21° (likely 67°19° to 70°21°)	70°21°	0%	5 mph8 km/h from E, gusts 6 mph10 km/h	87%	29%	0
Sat 6a	Partly cloudy	69°21° (likely 68°20° to 70°21°)	69°21°	5%	6 mph10 km/h from E, gusts 8 mph12 km/h	90%	38%	0
Sat 7a	Clear	69°21° (likely 67°19° to 70°21°)	69°21°	10%, 0.01 in0.3 mm	6 mph10 km/h from E, gusts 8 mph13 km/h	91%	19%	0
Sat 8a	Sunny	70°21° (likely 67°19° to 72°22°)	70°21°	10%, 0.01 in0.3 mm	7 mph11 km/h from E, gusts 9 mph14 km/h	91%	25%	0
Sat 9a	Sunny	74°23° (likely 73°23° to 77°25°)	74°23°	5%, 0.01 in0.3 mm	7 mph11 km/h from ESE, gusts 11 mph17 km/h	86%	23%	1
Sat 10a	Partly sunny	79°26° (likely 79°26° to 81°27°)	82°28°	10%, 0.01 in0.3 mm	10 mph16 km/h from ESE, gusts 19 mph30 km/h	74%	22%	2
Sat 11a	Partly sunny	82°28° (likely 82°28° to 84°29°)	86°30°	10%, 0.01 in0.3 mm	14 mph23 km/h from ESE, gusts 18 mph30 km/h	67%	41%	4
Sat 12p	Sunny	85°29° (likely 83°28° to 86°30°)	89°32°	20%, 0.01 in0.3 mm	14 mph23 km/h from ESE, gusts 19 mph31 km/h	59%	38%	5
Sat 1p	Partly sunny	86°30° (likely 84°29° to 87°31°)	90°32°	10%	15 mph24 km/h from ESE, gusts 18 mph30 km/h	57%	41%	3
Sat 2p	Showers	87°31° (likely 85°29° to 88°31°)	90°32°	20%	15 mph24 km/h from ESE, gusts 19 mph30 km/h	55%	43%	3
Sat 3p	Showers	87°31° (likely 84°29° to 88°31°)	91°33°	20%	15 mph24 km/h from ESE, gusts 20 mph32 km/h	53%	46%	3
Sat 4p	Partly sunny	86°30° (likely 83°28° to 87°31°)	89°32°	10%	16 mph26 km/h from ESE, gusts 21 mph34 km/h	55%	37%	2
Sat 5p	Sunny	85°29° (likely 82°28° to 86°30°)	88°31°	10%	16 mph26 km/h from ESE, gusts 22 mph35 km/h	56%	34%	1
Sat 6p	Partly sunny	84°29° (likely 81°27° to 84°29°)	87°31°	5%	16 mph26 km/h from ESE, gusts 23 mph37 km/h	57%	30%	1
Sat 7p	Partly cloudy	80°27° (likely 79°26° to 81°27°)	82°28°	0%	14 mph23 km/h from ESE, gusts 23 mph38 km/h	65%	27%	0
Sat 8p	Partly cloudy	78°26° (likely 78°26° to 78°26°)	78°26°	0%	12 mph19 km/h from ESE, gusts 21 mph34 km/h	69%	32%	0
Sat 9p	Partly cloudy	77°25° (likely 76°24° to 77°25°)	77°25°	0%	9 mph14 km/h from ESE, gusts 17 mph27 km/h	74%	35%	0
Sat 10p	Partly cloudy	76°24° (likely 75°24° to 76°24°)	76°24°	0%	9 mph14 km/h from ESE, gusts 13 mph21 km/h	75%	40%	0
Sat 11p	Mostly cloudy	75°24° (likely 74°23° to 76°24°)	75°24°	0%	8 mph13 km/h from ESE, gusts 13 mph22 km/h	78%	49%	0
Sun 12a	Cloudy	74°23° (likely 72°22° to 75°24°)	74°23°	0%	7 mph11 km/h from ESE, gusts 13 mph20 km/h	78%	85%	0
Sun 1a	Cloudy	74°23° (likely 71°22° to 74°23°)	74°23°	5%	7 mph11 km/h from ESE, gusts 12 mph19 km/h	78%	88%	0
Sun 2a	Cloudy	73°23° (likely 71°22° to 74°23°)	73°23°	5%	7 mph11 km/h from ESE, gusts 12 mph20 km/h	78%	91%	0
Sun 3a	Cloudy	72°22° (likely 70°21° to 74°23°)	72°22°	5%	6 mph10 km/h from E, gusts 11 mph17 km/h	80%	91%	0
Sun 4a	Cloudy	71°22° (likely 70°21° to 73°23°)	71°22°	5%	7 mph11 km/h from E, gusts 11 mph17 km/h	81%	88%	0
Sun 5a	Cloudy	71°22° (likely 69°21° to 72°22°)	71°22°	5%	6 mph10 km/h from E, gusts 10 mph15 km/h	81%	86%	0
Sun 6a	Cloudy	71°22° (likely 69°21° to 72°22°)	71°22°	5%	7 mph11 km/h from E, gusts 9 mph15 km/h	81%	86%	0
Sun 7a	Cloudy	70°21° (likely 69°21° to 72°22°)	70°21°	5%	7 mph11 km/h from E, gusts 10 mph16 km/h	82%	88%	0
Sun 8a	Cloudy	71°22° (likely 70°21° to 73°23°)	71°22°	5%	7 mph11 km/h from E, gusts 9 mph15 km/h	82%	95%	0
Sun 9a	Cloudy	74°23° (likely 73°23° to 77°25°)	74°23°	0%	7 mph11 km/h from E, gusts 11 mph18 km/h	78%	97%	1
Sun 10a	Cloudy	79°26° (likely 78°26° to 80°27°)	79°26°	0%	10 mph16 km/h from ESE, gusts 13 mph21 km/h	67%	98%	2
Sun 11a	Cloudy	82°28° (likely 81°27° to 82°28°)	84°29°	0%	13 mph21 km/h from ESE, gusts 17 mph27 km/h	60%	98%	3
Sun 12p	Cloudy	84°29° (likely 83°28° to 84°29°)	86°30°	0%	13 mph21 km/h from ESE, gusts 17 mph27 km/h	54%	98%	2
Sun 1p	Cloudy	85°29° (likely 83°28° to 85°29°)	87°31°	0%	13 mph21 km/h from ESE, gusts 15 mph25 km/h	51%	97%	3
Sun 2p	Cloudy	86°30° (likely 79°26° to 86°30°)	88°31°	0%	13 mph21 km/h from ESE, gusts 16 mph26 km/h	49%	98%	3
Sun 3p	Cloudy	86°30° (likely 79°26° to 86°30°)	87°31°	0%	13 mph21 km/h from ESE, gusts 17 mph27 km/h	48%	95%	2
Sun 4p	Cloudy	85°29° (likely 81°27° to 85°29°)	86°30°	0%	13 mph21 km/h from E, gusts 16 mph26 km/h	49%	98%	1
Sun 5p	Cloudy	84°29° (likely 79°26° to 84°29°)	85°29°	0%	14 mph23 km/h from E, gusts 16 mph26 km/h	51%	97%	1
Sun 6p	Cloudy	82°28° (likely 79°26° to 82°28°)	83°28°	0%	13 mph21 km/h from E, gusts 15 mph25 km/h	55%	97%	1
Sun 7p	Cloudy	79°26° (likely 78°26° to 80°27°)	79°26°	0%	12 mph19 km/h from E, gusts 18 mph28 km/h	62%	96%	0
Sun 8p	Cloudy	76°24° (likely 76°24° to 78°26°)	77°25°	0%	9 mph14 km/h from E, gusts 17 mph27 km/h	68%	92%	0
Sun 9p	Cloudy	75°24° (likely 75°24° to 76°24°)	75°24°	0%	7 mph11 km/h from E, gusts 13 mph21 km/h	73%	94%	0
Sun 10p	Cloudy	74°23° (likely 73°23° to 75°24°)	74°23°	0%	5 mph8 km/h from E, gusts 10 mph17 km/h	77%	91%	0
Sun 11p	Cloudy	73°23° (likely 72°22° to 74°23°)	73°23°	0%	3 mph5 km/h from E, gusts 10 mph16 km/h	80%	85%	0
Mon 12a	Cloudy	72°22° (likely 71°22° to 73°23°)	72°22°	0%	3 mph5 km/h from E, gusts 10 mph16 km/h	81%	92%	0
Mon 1a	Cloudy	71°22° (likely 71°22° to 73°23°)	71°22°	0%	3 mph5 km/h from E, gusts 9 mph15 km/h	82%	67%	0
Mon 2a	Mostly cloudy	70°21° (likely 70°21° to 72°22°)	70°21°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	83%	47%	0
Mon 3a	Mostly cloudy	70°21° (likely 68°20° to 72°22°)	70°21°	0%	3 mph5 km/h from E, gusts 6 mph9 km/h	84%	28%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Partly sunny. High 88°31°, low 69°21°. Typical 86°30° / 65°18°. Rain 0.02 in0.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 70°21°
  Dry
2. Afternoon
  noon–6 PM
  Showers, 87°31°
  20% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 78°26°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 71°22°
  Dry
Official NWS forecast
Today: A slight chance of rain showers between noon and 4pm. Mostly sunny, with a high near 88. East southeast wind 6 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Tonight: Mostly clear, with a low around 69. East southeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
85°29°–88°31°
Low, likely
67°19°–70°21°
Typical high / low
86°30° / 65°18°
Wind
18 mph29 km/h, gusts 29 mph47 km/h
UV peak
5
Tomorrow, Oct 25. Mostly cloudy. High 86°30°, low 67°19°. Typical 86°30° / 64°18°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 71°22°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 86°30°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 76°24°
  Dry
4. Overnight
  midnight–6 AM
  Mostly cloudy, 68°20°
  Dry
Official NWS forecast
Day: Partly sunny, with a high near 86. East wind 7 to 14 mph, with gusts as high as 23 mph.
Night: Mostly cloudy, with a low around 67. East wind 3 to 13 mph, with gusts as high as 23 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
83°28°–86°30°
Low, likely
67°19°–72°22°
Typical high / low
86°30° / 64°18°
Wind
15 mph24 km/h, gusts 24 mph38 km/h
UV peak
3
Monday, Oct 26. Cloudy. High 87°31°, low 69°21°. Typical 86°30° / 64°18°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 67°20°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 87°30°
  Dry
3. Evening
  6 PM–midnight
  Clear, 77°25°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 71°22°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 87. East northeast wind 3 to 10 mph.
Night: Mostly cloudy, with a low around 69. East wind 2 to 10 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
85°29°–87°31°
Low, likely
64°18°–70°21°
Typical high / low
86°30° / 64°18°
Wind
15 mph24 km/h, gusts 22 mph35 km/h
UV peak
7
Tuesday, Oct 27. Drizzle. High 85°29°, low 69°21°. Typical 85°29° / 64°18°. Rain 0.1 in2.5 mm, 50% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 72°22°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 84°29°
  50% chance · 0.05 in1.4 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 76°25°
  40% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Cloudy, 71°22°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. East wind 3 to 10 mph. Chance of precipitation is 50%.
Night: A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 69. East southeast wind 2 to 12 mph. Chance of precipitation is 50%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
83°28°–86°30°
Low, likely
69°21°–72°22°
Typical high / low
85°29° / 64°18°
Wind
14 mph23 km/h, gusts 24 mph39 km/h
UV peak
6
Wednesday, Oct 28. Partly sunny. High 87°31°, low 68°20°. Typical 85°29° / 64°18°. Rain 0.08 in2 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 72°22°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 87°31°
  30% chance · 0.03 in0.8 mm
3. Evening
  6 PM–midnight
  Mostly clear, 79°26°
  30% chance
4. Overnight
  midnight–6 AM
  Mostly clear, 71°22°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. East wind 3 to 12 mph. Chance of precipitation is 20%.
Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 68. East wind 3 to 12 mph. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
85°29°–89°32°
Low, likely
68°20°–72°22°
Typical high / low
85°29° / 64°18°
Wind
15 mph24 km/h, gusts 23 mph37 km/h
UV peak
6
Thursday, Oct 29. Drizzle. High 85°29°, low 69°21°. Typical 85°29° / 63°17°. Rain 0.22 in5.6 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 72°22°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 85°30°
  40% chance · 0.07 in1.9 mm
3. Evening
  6 PM–midnight
  Drizzle, 76°24°
  40% chance · 0.07 in1.7 mm
4. Overnight
  midnight–6 AM
  Cloudy, 72°22°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Night: A chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
83°28°–86°30°
Low, likely
69°21°–73°23°
Typical high / low
85°29° / 63°17°
Wind
15 mph24 km/h, gusts 22 mph35 km/h
UV peak
4
Friday, Oct 30. Mostly cloudy. High 87°31°, low 72°22°. Typical 84°29° / 63°17°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 74°23°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 86°30°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 79°26°
  20% chance
4. Overnight
  midnight–6 AM
  Clear, 73°23°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
85°29°–87°31°
Low, likely
70°21°–73°23°
Typical high / low
84°29° / 63°17°
Wind
15 mph24 km/h, gusts 21 mph34 km/h
UV peak
6
Saturday, Oct 31. Mostly sunny. High 89°32°, low 74°23°. Typical 84°29° / 63°17°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 76°24°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 89°32°
  Dry
3. Evening
  6 PM–midnight
  Clear, 82°28°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 74°24°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
88°31°–90°32°
Low, likely
73°23°–74°23°
Typical high / low
84°29° / 63°17°
Wind
16 mph26 km/h, gusts 21 mph34 km/h
UV peak
6
Sunday, Nov 1. Partly sunny. High 90°32°, low 74°23°. Typical 84°29° / 62°17°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 76°24°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 90°32°
  Dry
3. Evening
  6 PM–midnight
  Clear, 83°28°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 76°24°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
88°31°–93°34°
Low, likely
73°23°–76°24°
Typical high / low
84°29° / 62°17°
Wind
15 mph24 km/h, gusts 24 mph38 km/h
UV peak
4
Monday, Nov 2. Sunny. High 90°32°, low 75°24°. Typical 84°29° / 62°17°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 80°27°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 89°32°
  Dry
3. Evening
  6 PM–midnight
  Clear, 81°27°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
88°31°–91°33°
Low, likely
74°23°–77°25°
Typical high / low
84°29° / 62°17°
Wind
15 mph23 km/h, gusts 28 mph45 km/h
UV peak
6

10 days15 days30 days

The outlook

Today
Dry, high 88°, low 69°.
Tomorrow
Dry, high 86°, low 67°.
Monday
Dry, high 87°, low 69°.
Rest of week
Highs 85–90°; chance of precipitation on Tuesday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (BRO) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Rio Grande near San Benito

14 mi

Below flood stage

Level: 34.5 ft
Flow: 130 cfs

Forecast peak 34.7 ft Wed 1 AM

Reading from Sat 2:15 AM · NWS gauge page

Arroyo Colorado South of Mercedes

1.7 mi

Level: 0.5 ft
Flow: 90 cfs

Reading from Sat 2:15 AM · NWS gauge page

North Floodway at Llano Grande

2.2 mi

Level: 52.5 ft

Reading from Sat 3 AM · NWS gauge page

Main Floodway South of Weslaco

5.9 mi

Level: 52.7 ft
Flow: 94 cfs

Reading from Sat 2:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Cooling this week

About 64% less cooling than a typical week.

This week 24Typical 67

Cooling degree days, base 65°F

Comfort

Sticky, humid air (dew point 64°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

HARLINGEN · official normals 1991–2020 · records 1912–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° warmer than typical.

Last 7 days vs normal

On average 5°3° colder than normal (daily mean temperature).

−12°−7°SunOct 18
−8°−4°MonOct 19
−1°TueOct 20
±0°WedOct 21
—ThuOct 22
−1°FriOct 23
—SatOct 24

Mercedes weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 11 h 20 min; Losing 1 min 29 s a day; shortest Dec 21, 50 min less
Golden hour: 6:24–7:10 PM; Morning 7:21–8:07 AM
Blue hour: 7:10–7:19 PM; Morning 7:12–7:21 AM; first light 7:12 AM

Stars tonight? Poor

Clouds most of the night (about 26% cover).

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:58 AM · rises 5:50 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Mercedes. A level horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Mercedes, TX weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Rio Grande near San Benito

Arroyo Colorado South of Mercedes

North Floodway at Llano Grande

Main Floodway South of Weslaco

For your home

Cooling this week

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Poor

Moon