Decatur, Illinois

Last updated: 5:14 PM CDT  ·  Refresh
23°C
Feels like 23°
Mostly Cloudy
▲ 24°  /  ▼ 12°
Wind
8 mph N
Humidity
71%
Dew Point
15°
Pressure
29.34 inHg
Visibility
10 mi
UV Index
5.0
Cloud Cover
67%
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%
6 PM
24°
18%
7 PM
24°
18%
8 PM
22°
18%
9 PM
19°
18%
10 PM
17°
16%
11 PM
17°
16%
12 AM
16°
7%
1 AM
16°
3%
2 AM
15°
3%
3 AM
14°
3%
4 AM
13°
3%
5 AM
13°
3%
6 AM
13°
3%
7 AM
14°
3%
8 AM
17°
3%
9 AM
19°
3%
10 AM
21°
3%
11 AM
21°
3%
12 PM
23°
3%
1 PM
24°
3%
2 PM
24°
3%
3 PM
24°
3%
4 PM
24°
3%
7-Day Forecast
Today
24° 12°
Partly Cloudy with a 29% chance of rain.
Thu
24° 12°
Mostly Clear.
Fri
23° 16°
Mostly Cloudy with a 51% chance of rain.
Sat
26° 17°
Overcast with a 47% chance of rain.
Sun
32° 21°
Mostly Cloudy with a 24% chance of rain.
Mon
33° 22°
Thunderstorm, 55% chance.
Tue
31° 19°
Partly Cloudy with a 24% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 23° Mostly Cloudy 29% 8 mph N 71%
6 PM 24° Partly Cloudy 18% 7 mph N 69%
7 PM 24° Partly Cloudy 18% 6 mph N 68%
8 PM 22° Partly Cloudy 18% 5 mph NNE 72%
9 PM 19° Clear 18% 5 mph NNE 74%
10 PM 17° Clear 16% 5 mph NE 77%
11 PM 17° Mostly Clear 16% 5 mph NE 80%
12 AM 16° Mostly Clear 7% 5 mph ENE 83%
1 AM 16° Mostly Clear 3% 5 mph ENE 86%
2 AM 15° Mostly Clear 3% 5 mph ENE 86%
3 AM 14° Clear 3% 5 mph ENE 87%
4 AM 13° Clear 3% 4 mph ENE 87%
5 AM 13° Clear 3% 4 mph ENE 87%
6 AM 13° Clear 3% 4 mph ENE 86%
7 AM 14° Clear 3% 4 mph ENE 83%
8 AM 17° Mostly Clear 3% 5 mph ENE 74%
9 AM 19° Mostly Clear 3% 6 mph ENE 66%
10 AM 21° Mostly Clear 3% 6 mph ENE 59%
11 AM 21° Mostly Clear 3% 6 mph ENE 56%
12 PM 23° Mostly Clear 3% 6 mph ENE 53%
1 PM 24° Mostly Clear 3% 6 mph ENE 51%
2 PM 24° Mostly Clear 3% 6 mph ENE 52%
3 PM 24° Mostly Clear 3% 6 mph ENE 52%
4 PM 24° Mostly Clear 3% 6 mph E 54%
15-Day Forecast
Today
7/22
Partly Cloudy
29%
12°
24°
Thu
7/23
Mostly Clear
3%
12°
24°
Fri
7/24
Mostly Cloudy
51%
16°
23°
Sat
7/25
Overcast
47%
17°
26°
Sun
7/26
Mostly Cloudy
24%
21°
32°
Mon
7/27
Thunderstorm
55%
22°
33°
Tue
7/28
Partly Cloudy
24%
19°
31°
Wed
7/29
Clear
18%
18°
28°
Thu
7/30
Clear
44%
17°
28°
Fri
7/31
Drizzle
51%
17°
29°
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, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE75 J/kg
MLCAPE29 J/kg
MUCAPE75 J/kg
SBCIN-10 J/kg
MLCIN0 J/kg
Lifted Index6.6
Kinematics
0–6 km Shear57 kt
0–1 km Shear4 kt
Eff. Shear—
0–1 km SRH-28
0–3 km SRH-106
Eff. SRH—
Storm Motion282° @ 29 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-7.5
Thermo & Levels
PWAT1.25 in
0–3 km LR4.7 °C/km
700–500 LR5.1 °C/km
Total Totals29.5
LCL888 hPa
LFC868 hPa
EL732 hPa
Freezing Lvl15,843 ft