Decatur, Illinois

Last updated: 4:13 PM CDT  ·  Refresh
23°C
Feels like 24°
Mostly Cloudy
▲ 25°  /  ▼ 12°
Wind
8 mph N
Humidity
72%
Dew Point
15°
Pressure
29.34 inHg
Visibility
10 mi
UV Index
4.8
Cloud Cover
79%
Sunrise
5:45 AM
Sunset
8:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Decatur is currently mostly cloudy at 23°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:45AM · Sunset: 8:18PM.

Alerts

No active alerts for this location.
32 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
29%
5 PM
25°
27%
6 PM
24°
5%
7 PM
24°
5%
8 PM
22°
5%
9 PM
19°
5%
10 PM
18°
3%
11 PM
17°
3%
12 AM
16°
3%
1 AM
16°
3%
2 AM
14°
3%
3 AM
14°
3%
4 AM
13°
3%
5 AM
13°
3%
6 AM
13°
3%
7 AM
14°
3%
8 AM
16°
3%
9 AM
18°
3%
10 AM
19°
3%
11 AM
21°
3%
12 PM
22°
3%
1 PM
22°
3%
2 PM
22°
3%
3 PM
24°
3%
7-Day Forecast
Today
25° 12°
Mostly Cloudy with a 29% chance of rain.
Thu
24° 12°
Mostly Clear.
Fri
22° 16°
Overcast with a 49% chance of rain.
Sat
26° 16°
Overcast with a 50% chance of rain.
Sun
32° 21°
Clear.
Mon
33° 22°
Clear with a 35% chance of rain.
Tue
31° 19°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Cloudy 29% 8 mph N 72%
5 PM 25° Mostly Cloudy 27% 7 mph N 70%
6 PM 24° Mostly Cloudy 5% 7 mph N 68%
7 PM 24° Partly Cloudy 5% 6 mph N 68%
8 PM 22° Partly Cloudy 5% 5 mph NNE 71%
9 PM 19° Mostly Clear 5% 5 mph NNE 74%
10 PM 18° Clear 3% 5 mph NE 77%
11 PM 17° Mostly Clear 3% 5 mph NE 80%
12 AM 16° Mostly Clear 3% 6 mph ENE 83%
1 AM 16° Mostly Clear 3% 5 mph ENE 86%
2 AM 14° Mostly Clear 3% 5 mph ENE 87%
3 AM 14° Clear 3% 4 mph ENE 88%
4 AM 13° Clear 3% 4 mph ENE 88%
5 AM 13° Clear 3% 4 mph ENE 88%
6 AM 13° Clear 3% 4 mph ENE 87%
7 AM 14° Clear 3% 4 mph ENE 84%
8 AM 16° Mostly Clear 3% 5 mph ENE 74%
9 AM 18° Mostly Clear 3% 5 mph ENE 66%
10 AM 19° Mostly Clear 3% 6 mph ENE 60%
11 AM 21° Mostly Clear 3% 6 mph ENE 57%
12 PM 22° Mostly Clear 3% 6 mph ENE 55%
1 PM 22° Mostly Clear 3% 5 mph E 53%
2 PM 22° Mostly Clear 3% 5 mph E 54%
3 PM 24° Mostly Clear 3% 6 mph E 54%
15-Day Forecast
Today
7/22
Mostly Cloudy
29%
12°
25°
Thu
7/23
Mostly Clear
3%
12°
24°
Fri
7/24
Overcast
49%
16°
22°
Sat
7/25
Overcast
50%
16°
26°
Sun
7/26
Clear
19%
21°
32°
Mon
7/27
Clear
35%
22°
33°
Tue
7/28
Clear
19%
19°
31°
Wed
7/29
Clear
25%
18°
29°
Thu
7/30
Drizzle
60%
14°
28°
Fri
7/31
Drizzle
60%
17°
28°
Sat
8/1
Drizzle
60%
17°
27°
Sun
8/2
Drizzle
60%
17°
27°
Mon
8/3
Drizzle
60%
17°
27°
Tue
8/4
Drizzle
60%
18°
28°
Wed
8/5
Drizzle
60%
18°
28°
32
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
24 AQI 4.5 µg/m³
O3
Ground-level ozone
Dominant
32 AQI 36 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 32 Good 32 24
Fri 40 Good 40 11
Sat 42 Good 42 27
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 Wed Jul 22, 19:00'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
SBCAPE106 J/kg
MLCAPE66 J/kg
MUCAPE106 J/kg
SBCIN0 J/kg
MLCIN-0 J/kg
Lifted Index6.8
Kinematics
0–6 km Shear62 kt
0–1 km Shear4 kt
Eff. Shear7 kt
0–1 km SRH-23
0–3 km SRH-71
Eff. SRH-71
Storm Motion281° @ 30 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index12.6
Thermo & Levels
PWAT1.23 in
0–3 km LR6.1 °C/km
700–500 LR3.4 °C/km
Total Totals30.1
LCL883 hPa
LFC993 hPa
EL703 hPa
Freezing Lvl15,804 ft