Marshall County, Illinois, United States

Last updated: 7:12 PM CDT  ·  Refresh
24°C
Feels like 27°
Mostly Cloudy
▲ 28°  /  ▼ 19°
Wind
4 mph NE
Humidity
90%
Dew Point
22°
Pressure
29.23 inHg
Visibility
6 mi
UV Index
1.9
Cloud Cover
84%
Sunrise
5:30 AM
Sunset
8:32 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Marshall County is currently mostly cloudy at 24°C. Precipitation is likely — peak probability 56% around 3 PM. Atmospheric instability is elevated (CAPE up to 1606 J/kg) — isolated convective development possible. Sunrise: 5:30AM · Sunset: 8:32PM.

Alerts

No active alerts for this location.
55 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
50%
8 PM
24°
54%
9 PM
23°
45%
10 PM
22°
28%
11 PM
22°
28%
12 AM
21°
23%
1 AM
21°
10%
2 AM
21°
11%
3 AM
21°
25%
4 AM
20°
11%
5 AM
19°
11%
6 AM
19°
11%
7 AM
19°
17%
8 AM
21°
25%
9 AM
22°
23%
10 AM
23°
32%
11 AM
23°
43%
12 PM
24°
52%
1 PM
24°
55%
2 PM
25°
55%
3 PM
25°
56%
4 PM
25°
38%
5 PM
27°
42%
6 PM
27°
37%
7-Day Forecast
Tonight
28° 19°
Mostly Cloudy with a 50% chance of rain.
Sun
27° 18°
Mostly Cloudy with a 55% chance of rain.
Mon
28° 17°
Mostly Clear.
Tue
28° 16°
Partly Cloudy.
Wed
27° 18°
Mostly Cloudy with a 43% chance of rain.
Thu
24° 18°
Rain, 90% chance.
Fri
26° 17°
Clear with a 42% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 24° Mostly Cloudy 50% 4 mph NE 90%
8 PM 24° Rain 54% 4 mph NNE 92%
9 PM 23° Overcast 45% 3 mph N 93%
10 PM 22° Overcast 28% 5 mph NNW 94%
11 PM 22° Overcast 28% 4 mph NNW 95%
12 AM 21° Overcast 23% 4 mph N 96%
1 AM 21° Overcast 10% 5 mph NNE 97%
2 AM 21° Overcast 11% 4 mph NNE 97%
3 AM 21° Overcast 25% 4 mph N 97%
4 AM 20° Overcast 11% 3 mph N 97%
5 AM 19° Overcast 11% 4 mph N 97%
6 AM 19° Mostly Cloudy 11% 4 mph N 97%
7 AM 19° Fog 17% 5 mph N 95%
8 AM 21° Mostly Cloudy 25% 6 mph N 91%
9 AM 22° Overcast 23% 6 mph NNW 87%
10 AM 23° Overcast 32% 7 mph N 84%
11 AM 23° Overcast 43% 7 mph N 82%
12 PM 24° Overcast 52% 7 mph N 81%
1 PM 24° Overcast 55% 7 mph N 80%
2 PM 25° Overcast 55% 8 mph N 81%
3 PM 25° Overcast 56% 8 mph N 81%
4 PM 25° Overcast 38% 8 mph N 82%
5 PM 27° Mostly Cloudy 42% 8 mph NNE 82%
6 PM 27° Mostly Cloudy 37% 8 mph NNE 83%
15-Day Forecast
Today
7/4
Mostly Cloudy
50%
19°
28°
Sun
7/5
Mostly Cloudy
55%
18°
27°
Mon
7/6
Mostly Clear
12%
17°
28°
Tue
7/7
Partly Cloudy
18%
16°
28°
Wed
7/8
Mostly Cloudy
43%
18°
27°
Thu
7/9
Rain
90%
18°
24°
Fri
7/10
Clear
42%
17°
26°
Sat
7/11
Mostly Clear
53%
16°
24°
Sun
7/12
Drizzle
43%
14°
26°
Mon
7/13
Partly Cloudy
44%
15°
26°
Tue
7/14
Drizzle
60%
17°
28°
Wed
7/15
Drizzle
60%
17°
27°
Thu
7/16
Drizzle
60%
16°
23°
Fri
7/17
Drizzle
60%
16°
24°
Sat
7/18
Drizzle
60%
17°
24°
55
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
55 AQI 11.2 µg/m³
O3
Ground-level ozone
36 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 55 Moderate 36 55
Mon 52 Moderate 39 52
Tue 63 Moderate 46 63
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 Sat Jul 4, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE727 J/kg
MLCAPE482 J/kg
MUCAPE727 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-2.7
Kinematics
0–6 km Shear25 kt
0–1 km Shear12 kt
Eff. Shear27 kt
0–1 km SRH-103
0–3 km SRH-127
Eff. SRH-127
Storm Motion210° @ 18 kt
0–1 km EHI-0.5
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.7
Thermo & Levels
PWAT1.82 in
0–3 km LR5.6 °C/km
700–500 LR5.2 °C/km
Total Totals45.4
LCL961 hPa
LFC990 hPa
EL238 hPa
Freezing Lvl14,081 ft