Grundy County, Illinois, United States

Last updated: 11:28 PM CDT  ·  Refresh
26°C
Feels like 29°
Mostly Clear
▲ 29°  /  ▼ 21°
Wind
8 mph SW
Humidity
92%
Dew Point
24°
Pressure
29.06 inHg
Visibility
8 mi
UV Index
0.0
Cloud Cover
20%
Sunrise
5:44 AM
Sunset
8:15 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Grundy County is currently mostly clear at 26°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2709 J/kg) — isolated convective development possible. Sunrise: 5:44AM · Sunset: 8:15PM.

Alerts

No active alerts for this location.
37 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
26°
22%
12 AM
26°
49%
1 AM
26°
4%
2 AM
24°
5%
3 AM
23°
5%
4 AM
22°
6%
5 AM
21°
6%
6 AM
21°
6%
7 AM
21°
6%
8 AM
22°
6%
9 AM
23°
6%
10 AM
23°
7%
11 AM
24°
7%
12 PM
25°
7%
1 PM
24°
7%
2 PM
25°
7%
3 PM
26°
7%
4 PM
26°
7%
5 PM
26°
7%
6 PM
26°
3%
7 PM
24°
3%
8 PM
23°
3%
9 PM
21°
3%
10 PM
20°
3%
7-Day Forecast
Tonight
29° 21°
Mostly Clear with a 22% chance of rain.
Tue
26° 17°
Partly Cloudy.
Wed
28° 14°
Clear.
Thu
29° 18°
Partly Cloudy with a 28% chance of rain.
Fri
23° 17°
Drizzle, 76% chance.
Sat
27° 17°
Rain, 90% chance.
Sun
27° 16°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 26° Mostly Clear 22% 8 mph SW 92%
12 AM 26° Clear 49% 7 mph W 93%
1 AM 26° Clear 4% 7 mph WNW 93%
2 AM 24° Partly Cloudy 5% 8 mph NW 92%
3 AM 23° Mostly Cloudy 5% 10 mph NNW 91%
4 AM 22° Mostly Cloudy 6% 10 mph N 91%
5 AM 21° Mostly Cloudy 6% 10 mph N 91%
6 AM 21° Mostly Cloudy 6% 10 mph N 91%
7 AM 21° Mostly Cloudy 6% 11 mph N 90%
8 AM 22° Mostly Cloudy 6% 11 mph N 89%
9 AM 23° Mostly Cloudy 6% 11 mph N 87%
10 AM 23° Mostly Cloudy 7% 11 mph N 84%
11 AM 24° Mostly Cloudy 7% 10 mph N 81%
12 PM 25° Mostly Cloudy 7% 10 mph N 78%
1 PM 24° Partly Cloudy 7% 10 mph N 75%
2 PM 25° Partly Cloudy 7% 10 mph N 72%
3 PM 26° Mostly Clear 7% 10 mph N 68%
4 PM 26° Clear 7% 10 mph N 67%
5 PM 26° Clear 7% 10 mph N 68%
6 PM 26° Clear 3% 10 mph NNE 70%
7 PM 24° Clear 3% 9 mph NNE 70%
8 PM 23° Clear 3% 9 mph NNE 69%
9 PM 21° Clear 3% 8 mph NNE 69%
10 PM 20° Clear 3% 8 mph NNE 69%
15-Day Forecast
Today
7/27
Mostly Clear
22%
21°
29°
Tue
7/28
Partly Cloudy
7%
17°
26°
Wed
7/29
Clear
6%
14°
28°
Thu
7/30
Partly Cloudy
28%
18°
29°
Fri
7/31
Drizzle
76%
17°
23°
Sat
8/1
Rain
90%
17°
27°
Sun
8/2
Clear
17%
16°
27°
Mon
8/3
Clear
17%
16°
27°
Tue
8/4
Drizzle
44%
18°
29°
Wed
8/5
Drizzle
44%
19°
29°
Thu
8/6
Rain
64%
18°
30°
Fri
8/7
Drizzle
60%
17°
29°
Sat
8/8
Drizzle
60%
18°
26°
Sun
8/9
Drizzle
60%
18°
26°
Mon
8/10
Drizzle
60%
18°
26°
37
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
37 AQI 6.7 µg/m³
O3
Ground-level ozone
36 AQI 40 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 37 Good 36 37
Wed 44 Good 44 38
Thu 44 Good 44 40
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 Tue Jul 28, 03:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1793 J/kg
MLCAPE2836 J/kg
MUCAPE3476 J/kg
SBCIN-147 J/kg
MLCIN0 J/kg
Lifted Index-5.2
Kinematics
0–6 km Shear45 kt
0–1 km Shear22 kt
Eff. Shear53 kt
0–1 km SRH64
0–3 km SRH29
Eff. SRH29
Storm Motion285° @ 36 kt
0–1 km EHI0.7
Composite Parameters
Sig. Tornado1.1
STP (eff)0.2
Supercell2.8
K-Index27.2
Thermo & Levels
PWAT1.91 in
0–3 km LR4.1 °C/km
700–500 LR6.8 °C/km
Total Totals51.1
LCL963 hPa
LFC803 hPa
EL168 hPa
Freezing Lvl16,286 ft