Excessive Heat Warning — Buchanan, IA, Delaware, IA, Dubuque, IA, Benton, IA, Linn, IA, Jones, IA, Jackson, IA, Iowa, IA, Johnson, IA, Cedar, IA, Clinton, IA, Muscatine, IA, Scott, IA, Keokuk, IA, Washington, IA, Louisa, IA, Jefferson, IA, Henry, IA, Des Moines, IA, Van Buren, IA, Lee, IA, Whiteside, IL, Rock Island, IL, Henry, IL, Bureau, IL, Putnam, IL, Mercer, IL, Henderson, IL, Warren, IL, Hancock, IL, McDonough, IL, Scotland, MO, Clark, MO 9:00 PM Extreme Heat Watch 10:00 PM

Johnson County, Iowa, United States

Last updated: 7:44 AM CDT  ·  Refresh
25°C
Feels like 29°
Fog
▲ 36°  /  ▼ 24°
Wind
4 mph S
Humidity
94%
Dew Point
24°
Pressure
29.13 inHg
Visibility
0 mi
UV Index
1.9
Cloud Cover
92%
Sunrise
5:55 AM
Sunset
8:30 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Johnson County is currently fog at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3532 J/kg) — isolated convective development possible. Sunrise: 5:55AM · Sunset: 8:30PM.

Alerts

Excessive Heat Warning
Buchanan, IA, Delaware, IA, Dubuque, IA, Benton, IA, Linn, IA, Jones, IA, Jackson, IA, Iowa, IA, Johnson, IA, Cedar, IA, Clinton, IA, Muscatine, IA, Scott, IA, Keokuk, IA, Washington, IA, Louisa, IA, Jefferson, IA, Henry, IA, Des Moines, IA, Van Buren, IA, Lee, IA, Whiteside, IL, Rock Island, IL, Henry, IL, Bureau, IL, Putnam, IL, Mercer, IL, Henderson, IL, Warren, IL, Hancock, IL, McDonough, IL, Scotland, MO, Clark, MO
Expires 9:00 PM
Extreme Heat Watch
Expires 10:00 PM
56 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
11%
8 AM
26°
11%
9 AM
27°
3%
10 AM
29°
16%
11 AM
31°
3%
12 PM
32°
3%
1 PM
33°
3%
2 PM
34°
3%
3 PM
36°
3%
4 PM
36°
3%
5 PM
36°
3%
6 PM
35°
3%
7 PM
33°
5%
8 PM
32°
5%
9 PM
30°
5%
10 PM
29°
17%
11 PM
28°
22%
12 AM
28°
22%
1 AM
27°
22%
2 AM
26°
17%
3 AM
26°
18%
4 AM
26°
9%
5 AM
25°
5%
6 AM
25°
5%
7-Day Forecast
Today
36° 24°
Partly Cloudy.
Mon
36° 24°
Mostly Clear with a 22% chance of rain.
Tue
31° 21°
Partly Cloudy.
Wed
30° 18°
Partly Cloudy.
Thu
30° 17°
Clear with a 30% chance of rain.
Fri
27° 19°
Rain, 71% chance.
Sat
29° 18°
Rain, 55% chance.
TimeTempConditionsPrecipWindHumidity
Now 25° Fog 11% 4 mph S 94%
8 AM 26° Overcast 11% 3 mph S 89%
9 AM 27° Overcast 3% 4 mph S 85%
10 AM 29° Overcast 16% 4 mph SSW 80%
11 AM 31° Mostly Cloudy 3% 4 mph SSW 74%
12 PM 32° Partly Cloudy 3% 5 mph SSW 68%
1 PM 33° Partly Cloudy 3% 5 mph SW 64%
2 PM 34° Mostly Clear 3% 4 mph WSW 60%
3 PM 36° Partly Cloudy 3% 3 mph WSW 56%
4 PM 36° Mostly Clear 3% 3 mph WSW 56%
5 PM 36° Mostly Clear 3% 3 mph SW 58%
6 PM 35° Partly Cloudy 3% 3 mph SSE 61%
7 PM 33° Partly Cloudy 5% 3 mph SSE 66%
8 PM 32° Partly Cloudy 5% 5 mph SSE 72%
9 PM 30° Partly Cloudy 5% 6 mph S 77%
10 PM 29° Partly Cloudy 17% 6 mph S 78%
11 PM 28° Partly Cloudy 22% 6 mph SSW 76%
12 AM 28° Partly Cloudy 22% 6 mph SSW 75%
1 AM 27° Partly Cloudy 22% 5 mph S 78%
2 AM 26° Partly Cloudy 17% 4 mph SSE 82%
3 AM 26° Partly Cloudy 18% 6 mph SE 85%
4 AM 26° Partly Cloudy 9% 6 mph SE 87%
5 AM 25° Partly Cloudy 5% 7 mph SSE 88%
6 AM 25° Haze 5% 9 mph SSE 89%
15-Day Forecast
Today
7/26
Partly Cloudy
17%
24°
36°
Mon
7/27
Mostly Clear
22%
24°
36°
Tue
7/28
Partly Cloudy
7%
21°
31°
Wed
7/29
Partly Cloudy
19%
18°
30°
Thu
7/30
Clear
30%
17°
30°
Fri
7/31
Rain
71%
19°
27°
Sat
8/1
Rain
55%
18°
29°
Sun
8/2
Clear
3%
17°
29°
Mon
8/3
Drizzle
44%
18°
31°
Tue
8/4
Drizzle
51%
20°
33°
Wed
8/5
Drizzle
60%
18°
32°
Thu
8/6
Drizzle
60%
18°
29°
Fri
8/7
Drizzle
60%
18°
31°
Sat
8/8
Drizzle
60%
19°
32°
Sun
8/9
Drizzle
60%
19°
34°
56
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
56 AQI 11.9 µg/m³
O3
Ground-level ozone
35 AQI 38 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 56 Moderate 35 56
Tue 49 Good 39 49
Wed 60 Moderate 38 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 Sun Jul 26, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2368 J/kg
MLCAPE2955 J/kg
MUCAPE4056 J/kg
SBCIN-298 J/kg
MLCIN0 J/kg
Lifted Index-7.4
Kinematics
0–6 km Shear27 kt
0–1 km Shear16 kt
Eff. Shear28 kt
0–1 km SRH-106
0–3 km SRH-304
Eff. SRH-325
Storm Motion275° @ 29 kt
0–1 km EHI-1.6
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.0
Thermo & Levels
PWAT1.86 in
0–3 km LR3.8 °C/km
700–500 LR7.8 °C/km
Total Totals49.6
LCL975 hPa
LFC678 hPa
EL174 hPa
Freezing Lvl14,951 ft