LaSalle County, Illinois, United States

Last updated: 4:43 AM CDT  ·  Refresh
19°C
Feels like 19°
Mostly Cloudy
▲ 25°  /  ▼ 17°
Wind
7 mph NE
Humidity
92%
Dew Point
17°
Pressure
29.58 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
61%
Sunrise
6:39 AM
Sunset
6:59 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: LaSalle County is currently mostly cloudy at 19°C. Precipitation is likely — peak probability 71% around 4 AM. Sunrise: 6:39AM · Sunset: 6:59PM.

Alerts

No active alerts for this location.
38 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
3%
5 AM
17°
21%
6 AM
17°
21%
7 AM
18°
25%
8 AM
18°
25%
9 AM
19°
25%
10 AM
20°
24%
11 AM
21°
43%
12 PM
21°
29%
1 PM
24°
25%
2 PM
25°
21%
3 PM
25°
21%
4 PM
25°
31%
5 PM
25°
22%
6 PM
24°
17%
7 PM
23°
40%
8 PM
23°
55%
9 PM
21°
56%
10 PM
21°
56%
11 PM
20°
57%
12 AM
20°
54%
1 AM
20°
54%
2 AM
20°
59%
3 AM
20°
59%
7-Day Forecast
Today
25° 17°
Partly Cloudy with a 56% chance of rain.
Sat
28° 17°
Overcast with a 78% chance of rain.
Sun
27° 15°
Mostly Cloudy with a 75% chance of rain.
Mon
20° 13°
Mostly Clear with a 74% chance of rain.
Tue
17° 10°
Rain, 43% chance.
Wed
20° 8°
Clear.
Thu
22° 11°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 19° Mostly Cloudy 3% 7 mph NE 92%
5 AM 17° Partly Cloudy 21% 6 mph NE 93%
6 AM 17° Partly Cloudy 21% 6 mph NE 93%
7 AM 18° Partly Cloudy 25% 8 mph NE 90%
8 AM 18° Partly Cloudy 25% 10 mph ENE 84%
9 AM 19° Mostly Clear 25% 11 mph ENE 79%
10 AM 20° Partly Cloudy 24% 11 mph ENE 76%
11 AM 21° Mostly Cloudy 43% 11 mph ENE 74%
12 PM 21° Partly Cloudy 29% 11 mph ENE 73%
1 PM 24° Partly Cloudy 25% 10 mph E 74%
2 PM 25° Mostly Clear 21% 9 mph E 75%
3 PM 25° Mostly Clear 21% 8 mph ESE 77%
4 PM 25° Mostly Clear 31% 8 mph ESE 79%
5 PM 25° Mostly Clear 22% 8 mph E 81%
6 PM 24° Partly Cloudy 17% 8 mph E 83%
7 PM 23° Partly Cloudy 40% 8 mph E 82%
8 PM 23° Mostly Cloudy 55% 9 mph E 81%
9 PM 21° Overcast 56% 9 mph E 79%
10 PM 21° Overcast 56% 10 mph E 83%
11 PM 20° Overcast 57% 10 mph ESE 86%
12 AM 20° Overcast 54% 10 mph ESE 89%
1 AM 20° Overcast 54% 10 mph ESE 90%
2 AM 20° Overcast 59% 9 mph ESE 90%
3 AM 20° Overcast 59% 8 mph ESE 91%
15-Day Forecast
Today
9/18
Partly Cloudy
56%
17°
25°
Sat
9/19
Overcast
78%
17°
28°
Sun
9/20
Mostly Cloudy
75%
15°
27°
Mon
9/21
Mostly Clear
74%
13°
20°
Tue
9/22
Rain
43%
10°
17°
Wed
9/23
Clear
8%
8°
20°
Thu
9/24
Clear
8%
11°
22°
Fri
9/25
Drizzle
43%
10°
23°
Sat
9/26
Clear
44%
11°
23°
Sun
9/27
Clear
44%
12°
25°
Mon
9/28
Drizzle
60%
13°
24°
Tue
9/29
Drizzle
60%
14°
24°
Wed
9/30
Drizzle
60%
14°
25°
Thu
10/1
Drizzle
60%
13°
24°
Fri
10/2
Drizzle
60%
12°
23°
38
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
29 AQI 5.2 µg/m³
O3
Ground-level ozone
Dominant
38 AQI 41 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 38 Good 38 29
Sat 33 Good 28 33
Sun 31 Good 27 31
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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Fri Sep 18, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE3 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index6.4
Kinematics
0–6 km Shear20 kt
0–1 km Shear4 kt
Eff. Shear—
0–1 km SRH35
0–3 km SRH154
Eff. SRH—
Storm Motion327° @ 23 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index21.0
Thermo & Levels
PWAT1.37 in
0–3 km LR2.9 °C/km
700–500 LR5.9 °C/km
Total Totals40.7
LCL978 hPa
LFC—
EL—
Freezing Lvl15,295 ft