Stephenson County, Illinois, United States

Last updated: 3:15 PM CDT  ·  Refresh
32°C
Feels like 37°
Clear
▲ 34°  /  ▼ 21°
Wind
2 mph W
Humidity
56%
Dew Point
22°
Pressure
29.27 inHg
Visibility
10 mi
UV Index
8.7
Cloud Cover
0%
Sunrise
5:34 AM
Sunset
8:34 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Stephenson County is currently clear at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2459 J/kg) — isolated convective development possible. Sunrise: 5:34AM · Sunset: 8:34PM.

Alerts

No active alerts for this location.
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
3%
4 PM
32°
3%
5 PM
34°
3%
6 PM
33°
3%
7 PM
32°
3%
8 PM
30°
3%
9 PM
27°
3%
10 PM
26°
3%
11 PM
25°
6%
12 AM
24°
6%
1 AM
23°
6%
2 AM
23°
6%
3 AM
22°
15%
4 AM
22°
15%
5 AM
21°
16%
6 AM
21°
16%
7 AM
22°
16%
8 AM
24°
16%
9 AM
26°
7%
10 AM
29°
13%
11 AM
29°
13%
12 PM
31°
13%
1 PM
31°
13%
2 PM
32°
13%
7-Day Forecast
Today
34° 21°
Clear.
Wed
33° 21°
Fog.
Thu
34° 23°
Mostly Clear with a 39% chance of rain.
Fri
31° 22°
Partly Cloudy with a 70% chance of rain.
Sat
31° 19°
Clear with a 30% chance of rain.
Sun
31° 18°
Drizzle, 52% chance.
Mon
31° 17°
Partly Cloudy with a 52% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 32° Clear 3% 2 mph W 56%
4 PM 32° Clear 3% 3 mph WSW 54%
5 PM 34° Clear 3% 3 mph WSW 58%
6 PM 33° Clear 3% 4 mph W 63%
7 PM 32° Clear 3% 4 mph WSW 68%
8 PM 30° Clear 3% 4 mph WSW 75%
9 PM 27° Clear 3% 4 mph WSW 81%
10 PM 26° Clear 3% 4 mph WSW 85%
11 PM 25° Clear 6% 4 mph W 87%
12 AM 24° Clear 6% 4 mph W 88%
1 AM 23° Clear 6% 4 mph W 90%
2 AM 23° Mostly Clear 6% 4 mph W 90%
3 AM 22° Mostly Clear 15% 4 mph WNW 91%
4 AM 22° Fog 15% 4 mph WNW 92%
5 AM 21° Fog 16% 4 mph WNW 92%
6 AM 21° Fog 16% 3 mph WNW 93%
7 AM 22° Haze 16% 3 mph WNW 92%
8 AM 24° Partly Cloudy 16% 4 mph WNW 87%
9 AM 26° Partly Cloudy 7% 4 mph WNW 82%
10 AM 29° Partly Cloudy 13% 4 mph WNW 77%
11 AM 29° Mostly Clear 13% 4 mph WNW 72%
12 PM 31° Mostly Clear 13% 4 mph WNW 69%
1 PM 31° Mostly Clear 13% 3 mph WNW 66%
2 PM 32° Mostly Clear 13% 3 mph WNW 64%
15-Day Forecast
Today
7/14
Clear
3%
21°
34°
Wed
7/15
Fog
16%
21°
33°
Thu
7/16
Mostly Clear
39%
23°
34°
Fri
7/17
Partly Cloudy
70%
22°
31°
Sat
7/18
Clear
30%
19°
31°
Sun
7/19
Drizzle
52%
18°
31°
Mon
7/20
Partly Cloudy
52%
17°
31°
Tue
7/21
Rain
69%
14°
26°
Wed
7/22
Mostly Clear
44%
14°
25°
Thu
7/23
Drizzle
60%
14°
27°
Fri
7/24
Drizzle
60%
16°
26°
Sat
7/25
Drizzle
60%
15°
27°
Sun
7/26
Drizzle
60%
16°
27°
Mon
7/27
Drizzle
60%
17°
28°
Tue
7/28
Drizzle
60%
17°
28°
54
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
54 AQI 10.5 µg/m³
O3
Ground-level ozone
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 54 Moderate 40 54
Thu 53 Moderate 44 53
Fri 60 Moderate 50 60
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 14, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1989 J/kg
MLCAPE938 J/kg
MUCAPE1989 J/kg
SBCIN-173 J/kg
MLCIN0 J/kg
Lifted Index-4.1
Kinematics
0–6 km Shear6 kt
0–1 km Shear2 kt
Eff. Shear9 kt
0–1 km SRH1
0–3 km SRH7
Eff. SRH7
Storm Motion36° @ 11 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.1
K-Index10.3
Thermo & Levels
PWAT1.18 in
0–3 km LR6.1 °C/km
700–500 LR6.9 °C/km
Total Totals39.0
LCL846 hPa
LFC641 hPa
EL175 hPa
Freezing Lvl16,165 ft