Hourly Weather | Today Monday, September 21, 2026
Active Weather Warnings
Brownsville, Texas
1 PM
Cloudy Weather
99°
Feels Like 109°
34
Humidity: 46%
UV Index: 8
Wind: 9 mph
2 PM
Sunny with a Chance of Thunderstorms
97°
Feels Like 102°
51
Humidity: 49%
UV Index: 3
Wind: 12 mph
3 PM
Cloudy Weather
97°
Feels Like 106°
47
Humidity: 49%
UV Index: 5
Wind: 13 mph
4 PM
Cloudy Weather
97°
Feels Like 102°
40
Humidity: 49%
UV Index: 3
Wind: 14 mph
5 PM
Cloudy Weather
93°
Feels Like 100°
34
Humidity: 53%
UV Index: 2
Wind: 15 mph
6 PM
Cloudy Weather
91°
Feels Like 99°
34
Humidity: 58%
UV Index: 1
Wind: 14 mph
7 PM
Cloudy Weather
90°
Feels Like 95°
23
Humidity: 64%
UV Index: 0
Wind: 13 mph
8 PM
Cloudy Night
88°
Feels Like 95°
1
Humidity: 71%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
84°
Feels Like 93°
1
Humidity: 76%
UV Index: 0
Wind: 9 mph
10 PM
Cloudy Night
84°
Feels Like 93°
1
Humidity: 77%
UV Index: 0
Wind: 8 mph
11 PM
Cloudy Night
84°
Feels Like 93°
1
Humidity: 79%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.72 µg/m³
  • PM10: 3.75 µg/m³
  • O3: 0.032 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

2 PM
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.58 µg/m³
  • PM10: 3.44 µg/m³
  • O3: 0.032 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

3 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.48 µg/m³
  • PM10: 3.16 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.35 µg/m³
  • PM10: 2.8 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.17 µg/m³
  • PM10: 2.4 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.99 µg/m³
  • PM10: 2.19 µg/m³
  • O3: 0.024 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.83 µg/m³
  • PM10: 2.05 µg/m³
  • O3: 0.021 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
18 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.75 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.019 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
16 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.78 µg/m³
  • PM10: 2.29 µg/m³
  • O3: 0.017 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
16 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.86 µg/m³
  • PM10: 2.49 µg/m³
  • O3: 0.017 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
15 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.95 µg/m³
  • PM10: 2.66 µg/m³
  • O3: 0.016 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Weather Alerts and Warnings for Brownsville

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued September 21 at 6:23AM CDT by NWS Brownsville TX
Sep 21, 6:23 AM Sep 21, 7:00 PM
The combination of hot temperatures and elevated humidity levels
will produce heat index values between 108 and 111 degrees for
several hours this afternoon into this evening. A few locations
may briefly experience heat index values above 111 degrees.

If you plan to spend time outside, drink plenty of water, wear
light weight and light colored clothing and take frequent breaks
from the heat. Young children and pets should never be left
unattended in vehicles.
Updated: Sep 21, 11:44 AM Source: NWS Alert