Excessive Heat Warning — Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 9:00 PM Excessive Heat Watch 7:00 PM

Brown County, Illinois, United States

Last updated: 7:44 AM CDT  ·  Refresh
26°C
Feels like 31°
Haze
▲ 36°  /  ▼ 24°
Wind
4 mph SSW
Humidity
96%
Dew Point
25°
Pressure
29.23 inHg
Visibility
1 mi
UV Index
2.2
Cloud Cover
90%
Sunrise
5:56 AM
Sunset
8:22 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Brown County is currently haze at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4402 J/kg) — isolated convective development possible. Sunrise: 5:56AM · Sunset: 8:22PM.

Alerts

Excessive Heat Warning
Greene, IL, Macoupin, IL, Montgomery, IL, Bond, IL, Fayette, IL, Clinton, IL, Marion, IL, Washington, IL, Randolph, IL, Adams, IL, Brown, IL, Pike, IL, Calhoun, IL, Jersey, IL, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Warren, MO, Franklin, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 9:00 PM
Excessive Heat Watch
Expires 7:00 PM
49 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
30%
8 AM
27°
33%
9 AM
28°
21%
10 AM
31°
31%
11 AM
32°
30%
12 PM
34°
29%
1 PM
35°
29%
2 PM
34°
31%
3 PM
34°
31%
4 PM
34°
39%
5 PM
35°
30%
6 PM
34°
18%
7 PM
33°
13%
8 PM
31°
19%
9 PM
29°
19%
10 PM
28°
10%
11 PM
28°
8%
12 AM
27°
8%
1 AM
26°
16%
2 AM
26°
16%
3 AM
26°
19%
4 AM
26°
19%
5 AM
26°
16%
6 AM
25°
9%
7-Day Forecast
Today
36° 24°
Mostly Cloudy with a 37% chance of rain.
Mon
38° 24°
Partly Cloudy with a 32% chance of rain.
Tue
33° 21°
Partly Cloudy.
Wed
32° 18°
Mostly Cloudy.
Thu
32° 18°
Mostly Cloudy with a 26% chance of rain.
Fri
30° 19°
Rain, 66% chance.
Sat
32° 18°
Mostly Cloudy with a 56% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 26° Haze 30% 4 mph SSW 96%
8 AM 27° Overcast 33% 5 mph SW 88%
9 AM 28° Overcast 21% 6 mph NW 82%
10 AM 31° Partly Cloudy 31% 6 mph WNW 76%
11 AM 32° Mostly Clear 30% 6 mph W 70%
12 PM 34° Partly Cloudy 29% 6 mph W 65%
1 PM 35° Partly Cloudy 29% 7 mph W 62%
2 PM 34° Partly Cloudy 31% 8 mph W 60%
3 PM 34° Mostly Cloudy 31% 8 mph WSW 59%
4 PM 34° Partly Cloudy 39% 8 mph W 58%
5 PM 35° Partly Cloudy 30% 8 mph W 58%
6 PM 34° Partly Cloudy 18% 8 mph W 59%
7 PM 33° Partly Cloudy 13% 6 mph W 60%
8 PM 31° Mostly Clear 19% 5 mph SW 62%
9 PM 29° Partly Cloudy 19% 5 mph S 64%
10 PM 28° Partly Cloudy 10% 6 mph S 67%
11 PM 28° Partly Cloudy 8% 6 mph SSW 70%
12 AM 27° Partly Cloudy 8% 6 mph SSW 73%
1 AM 26° Partly Cloudy 16% 6 mph SSW 74%
2 AM 26° Partly Cloudy 16% 6 mph SSW 75%
3 AM 26° Mostly Cloudy 19% 6 mph SSW 75%
4 AM 26° Mostly Cloudy 19% 4 mph S 78%
5 AM 26° Mostly Cloudy 16% 4 mph SE 81%
6 AM 25° Overcast 9% 6 mph ESE 84%
15-Day Forecast
Today
7/26
Mostly Cloudy
37%
24°
36°
Mon
7/27
Partly Cloudy
32%
24°
38°
Tue
7/28
Partly Cloudy
15%
21°
33°
Wed
7/29
Mostly Cloudy
17%
18°
32°
Thu
7/30
Mostly Cloudy
26%
18°
32°
Fri
7/31
Rain
66%
19°
30°
Sat
8/1
Mostly Cloudy
56%
18°
32°
Sun
8/2
Drizzle
46%
18°
32°
Mon
8/3
Clear
35%
18°
34°
Tue
8/4
Rain
59%
21°
34°
Wed
8/5
Drizzle
60%
20°
36°
Thu
8/6
Drizzle
60%
19°
34°
Fri
8/7
Drizzle
60%
19°
34°
Sat
8/8
Rain
90%
20°
36°
Sun
8/9
Drizzle
60%
21°
36°
49
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
49 AQI 8.9 µg/m³
O3
Ground-level ozone
41 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 49 Good 41 49
Tue 43 Good 39 43
Wed 45 Good 44 45
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Jul 26, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2444 J/kg
MLCAPE3422 J/kg
MUCAPE4125 J/kg
SBCIN-205 J/kg
MLCIN0 J/kg
Lifted Index-4.9
Kinematics
0–6 km Shear19 kt
0–1 km Shear16 kt
Eff. Shear26 kt
0–1 km SRH-13
0–3 km SRH-44
Eff. SRH-44
Storm Motion275° @ 20 kt
0–1 km EHI-0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index34.2
Thermo & Levels
PWAT1.86 in
0–3 km LR4.4 °C/km
700–500 LR6.1 °C/km
Total Totals48.5
LCL980 hPa
LFC715 hPa
EL168 hPa
Freezing Lvl16,181 ft