Stephenson County, Illinois, United States

Last updated: 3:57 PM CDT  ·  Refresh
33°C
Feels like 37°
Clear
▲ 34°  /  ▼ 21°
Wind
2 mph WSW
Humidity
54%
Dew Point
21°
Pressure
29.26 inHg
Visibility
10 mi
UV Index
8.1
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 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2504 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
33°
3%
4 PM
32°
3%
5 PM
34°
3%
6 PM
33°
3%
7 PM
31°
3%
8 PM
28°
3%
9 PM
26°
3%
10 PM
25°
3%
11 PM
24°
6%
12 AM
24°
6%
1 AM
23°
6%
2 AM
22°
15%
3 AM
22°
15%
4 AM
22°
15%
5 AM
21°
16%
6 AM
22°
16%
7 AM
23°
16%
8 AM
24°
7%
9 AM
27°
13%
10 AM
29°
13%
11 AM
30°
13%
12 PM
31°
13%
1 PM
31°
13%
2 PM
31°
13%
7-Day Forecast
Today
34° 21°
Clear.
Wed
33° 21°
Fog.
Thu
33° 22°
Clear with a 39% chance of rain.
Fri
31° 22°
Partly Cloudy with a 67% chance of rain.
Sat
31° 19°
Thunderstorm, 30% chance.
Sun
30° 18°
Drizzle, 52% chance.
Mon
31° 17°
Clear with a 31% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 3% 2 mph WSW 54%
4 PM 32° Clear 3% 3 mph WSW 57%
5 PM 34° Clear 3% 4 mph WSW 61%
6 PM 33° Clear 3% 4 mph W 67%
7 PM 31° Clear 3% 4 mph WSW 73%
8 PM 28° Clear 3% 4 mph WSW 79%
9 PM 26° Clear 3% 4 mph WSW 85%
10 PM 25° Clear 3% 4 mph WSW 86%
11 PM 24° Clear 6% 4 mph W 88%
12 AM 24° Clear 6% 4 mph W 89%
1 AM 23° Mostly Clear 6% 4 mph W 90%
2 AM 22° Mostly Clear 15% 4 mph WNW 91%
3 AM 22° Fog 15% 4 mph WNW 92%
4 AM 22° Fog 15% 4 mph WNW 92%
5 AM 21° Fog 16% 3 mph W 93%
6 AM 22° Fog 16% 3 mph W 94%
7 AM 23° Partly Cloudy 16% 3 mph WNW 88%
8 AM 24° Partly Cloudy 7% 4 mph WNW 84%
9 AM 27° Partly Cloudy 13% 4 mph WNW 78%
10 AM 29° Mostly Clear 13% 4 mph WNW 74%
11 AM 30° Mostly Clear 13% 4 mph WNW 70%
12 PM 31° Mostly Clear 13% 4 mph WNW 66%
1 PM 31° Mostly Clear 13% 3 mph WNW 65%
2 PM 31° 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
Clear
39%
22°
33°
Fri
7/17
Partly Cloudy
67%
22°
31°
Sat
7/18
Thunderstorm
30%
19°
31°
Sun
7/19
Drizzle
52%
18°
30°
Mon
7/20
Clear
31%
17°
31°
Tue
7/21
Rain
69%
14°
26°
Wed
7/22
Drizzle
44%
13°
25°
Thu
7/23
Drizzle
60%
15°
25°
Fri
7/24
Drizzle
60%
15°
25°
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
SBCAPE2005 J/kg
MLCAPE940 J/kg
MUCAPE2005 J/kg
SBCIN-156 J/kg
MLCIN0 J/kg
Lifted Index-4.1
Kinematics
0–6 km Shear6 kt
0–1 km Shear3 kt
Eff. Shear10 kt
0–1 km SRH0
0–3 km SRH12
Eff. SRH12
Storm Motion28° @ 10 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 LR6.2 °C/km
700–500 LR6.9 °C/km
Total Totals39.0
LCL841 hPa
LFC642 hPa
EL175 hPa
Freezing Lvl16,152 ft