Mercer County, Illinois, United States

Last updated: 12:09 PM CDT · Refresh

20°C

Feels like 21°

Overcast

▲ 21° / ▼ 15°

Wind

8 mph NE

Humidity

92%

Dew Point

19°

Pressure

29.20 inHg

Visibility

9 mi

UV Index

3.2

Cloud Cover

93%

Sunrise

6:48 AM

Sunset

7:03 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Mercer County is currently overcast at 20°C. Precipitation is likely — peak probability 81% around 4 PM. Sunrise: 6:48AM · Sunset: 7:03PM.

30 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

20°

68%

1 PM

20°

56%

2 PM

19°

37%

3 PM

19°

63%

4 PM

18°

81%

5 PM

19°

62%

6 PM

19°

49%

7 PM

18°

49%

8 PM

18°

49%

9 PM

18°

53%

10 PM

18°

53%

11 PM

17°

54%

12 AM

17°

55%

1 AM

17°

32%

2 AM

17°

32%

3 AM

17°

38%

4 AM

16°

37%

5 AM

16°

36%

6 AM

15°

29%

7 AM

16°

29%

8 AM

16°

30%

9 AM

15°

39%

10 AM

15°

39%

11 AM

15°

44%

7-Day Forecast

Today

21° 15°

Overcast with a 68% chance of rain.

Mon

19° 13°

Overcast with a 55% chance of rain.

Tue

17° 10°

Mostly Cloudy with a 54% chance of rain.

Wed

21° 8°

Partly Cloudy.

Thu

22° 9°

Clear.

Fri

22° 13°

Clear.

Sat

21° 12°

Clear.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 20° Overcast 68% 8 mph NE 92%

1 PM 20° Overcast 56% 13 mph NE 92%

2 PM 19° Overcast 37% 13 mph NE 92%

3 PM 19° Overcast 63% 13 mph NE 92%

4 PM 18° Overcast 81% 13 mph NE 93%

5 PM 19° Overcast 62% 13 mph NE 93%

6 PM 19° Overcast 49% 14 mph NE 92%

7 PM 18° Overcast 49% 14 mph NE 91%

8 PM 18° Overcast 49% 14 mph NE 90%

9 PM 18° Overcast 53% 14 mph ENE 90%

10 PM 18° Overcast 53% 14 mph ENE 90%

11 PM 17° Overcast 54% 14 mph NE 90%

12 AM 17° Overcast 55% 14 mph NE 91%

1 AM 17° Overcast 32% 13 mph NE 91%

2 AM 17° Overcast 32% 12 mph ENE 90%

3 AM 17° Overcast 38% 12 mph ENE 89%

4 AM 16° Overcast 37% 12 mph ENE 88%

5 AM 16° Overcast 36% 12 mph ENE 88%

6 AM 15° Overcast 29% 12 mph ENE 88%

7 AM 16° Overcast 29% 13 mph ENE 87%

8 AM 16° Overcast 30% 13 mph ENE 88%

9 AM 15° Overcast 39% 13 mph ENE 88%

10 AM 15° Overcast 39% 13 mph ENE 88%

11 AM 15° Overcast 44% 13 mph ENE 88%

15-Day Forecast

Today

9/20

Overcast

68%

15°

21°

Mon

9/21

Overcast

55%

13°

19°

Tue

9/22

Mostly Cloudy

54%

10°

17°

Wed

9/23

Partly Cloudy

19%

8°

21°

Thu

9/24

Clear

9°

22°

Fri

9/25

Clear

13°

22°

Sat

9/26

Clear

17%

12°

21°

Sun

9/27

Drizzle

42%

12°

24°

Mon

9/28

Clear

43%

12°

24°

Tue

9/29

Drizzle

51%

13°

23°

Wed

9/30

Drizzle

60%

14°

24°

Thu

10/1

Drizzle

60%

13°

23°

Fri

10/2

Drizzle

60%

12°

22°

Sat

10/3

Clear

25%

11°

22°

Sun

10/4

Drizzle

60%

11°

21°

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

PM_2.5

Fine particulate matter

19 AQI 3.6 µg/m³

O₃

Ground-level ozone

Dominant

30 AQI 33 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Mon 30 Good 30 19

Tue 20 Good 20 11

Wed 29 Good 29 8

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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Sun Sep 20, 15:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE22 J/kg

MLCAPE15 J/kg

MUCAPE22 J/kg

SBCIN-0 J/kg

MLCIN0 J/kg

Lifted Index1.3

Kinematics

0–6 km Shear23 kt

0–1 km Shear3 kt

Eff. Shear—

0–1 km SRH2

0–3 km SRH71

Eff. SRH—

Storm Motion325° @ 20 kt

0–1 km EHI0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)—

Supercell—

K-Index33.5

Thermo & Levels

PWAT1.90 in

0–3 km LR4.7 °C/km

700–500 LR5.2 °C/km

Total Totals41.6

LCL974 hPa

LFC989 hPa

EL579 hPa

Freezing Lvl13,465 ft

Mercer County, Illinois, United States

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