Heat Advisory — Hardin, OH, Mercer, OH, Auglaize, OH, Darke, OH, Shelby, OH, Logan, OH, Miami, OH, Champaign, OH, Clark, OH, Preble, OH, Montgomery, OH, Greene, OH, Butler, OH, Warren, OH, Clinton, OH, Hamilton, OH, Clermont, OH, Brown, OH, Highland, OH, Adams, OH, Union, OH, Delaware, OH, Madison, OH, Franklin, OH, Licking, OH, Fayette, OH, Pickaway, OH, Fairfield, OH, Ross, OH, Hocking, OH, Pike, OH, Scioto, OH 7:00 PM Excessive Heat Warning — Hardin, OH, Mercer, OH, Auglaize, OH, Darke, OH, Shelby, OH, Logan, OH, Union, OH, Delaware, OH, Miami, OH, Champaign, OH, Clark, OH, Madison, OH, Franklin, OH, Licking, OH, Preble, OH, Montgomery, OH, Greene, OH, Fayette, OH, Pickaway, OH, Fairfield, OH, Butler, OH, Warren, OH, Clinton, OH, Ross, OH, Hocking, OH, Hamilton, OH, Clermont, OH, Brown, OH, Highland, OH, Adams, OH, Pike, OH, Scioto, OH 7:00 PM

Union County, Ohio, United States

Last updated: 5:04 PM CDT  ·  Refresh
33°C
Feels like 39°
Clear
▲ 34°  /  ▼ 22°
Wind
10 mph SW
Humidity
62%
Dew Point
23°
Pressure
28.99 inHg
Visibility
9 mi
UV Index
6.3
Cloud Cover
0%
Sunrise
6:07 AM
Sunset
9:07 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Union County is currently clear at 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3694 J/kg) — isolated convective development possible. Sunrise: 6:07AM · Sunset: 9:07PM.

Alerts

Heat Advisory
Hardin, OH, Mercer, OH, Auglaize, OH, Darke, OH, Shelby, OH, Logan, OH, Miami, OH, Champaign, OH, Clark, OH, Preble, OH, Montgomery, OH, Greene, OH, Butler, OH, Warren, OH, Clinton, OH, Hamilton, OH, Clermont, OH, Brown, OH, Highland, OH, Adams, OH, Union, OH, Delaware, OH, Madison, OH, Franklin, OH, Licking, OH, Fayette, OH, Pickaway, OH, Fairfield, OH, Ross, OH, Hocking, OH, Pike, OH, Scioto, OH
Expires 7:00 PM
Excessive Heat Warning
Hardin, OH, Mercer, OH, Auglaize, OH, Darke, OH, Shelby, OH, Logan, OH, Union, OH, Delaware, OH, Miami, OH, Champaign, OH, Clark, OH, Madison, OH, Franklin, OH, Licking, OH, Preble, OH, Montgomery, OH, Greene, OH, Fayette, OH, Pickaway, OH, Fairfield, OH, Butler, OH, Warren, OH, Clinton, OH, Ross, OH, Hocking, OH, Hamilton, OH, Clermont, OH, Brown, OH, Highland, OH, Adams, OH, Pike, OH, Scioto, OH
Expires 7:00 PM
62 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
3%
7 PM
33°
3%
8 PM
31°
3%
9 PM
29°
3%
10 PM
27°
3%
11 PM
26°
3%
12 AM
26°
3%
1 AM
24°
3%
2 AM
24°
3%
3 AM
23°
3%
4 AM
23°
3%
5 AM
23°
3%
6 AM
22°
3%
7 AM
22°
3%
8 AM
24°
3%
9 AM
26°
3%
10 AM
28°
3%
11 AM
29°
3%
12 PM
29°
3%
1 PM
32°
3%
2 PM
33°
3%
3 PM
33°
3%
4 PM
33°
3%
5 PM
34°
3%
7-Day Forecast
Tonight
34° 22°
Clear.
Thu
34° 22°
Mostly Clear.
Fri
34° 23°
Partly Cloudy with a 55% chance of rain.
Sat
32° 22°
Mostly Cloudy with a 56% chance of rain.
Sun
31° 21°
Rain, 64% chance.
Mon
31° 21°
Rain, 82% chance.
Tue
28° 20°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 3% 10 mph SW 62%
7 PM 33° Clear 3% 8 mph SW 67%
8 PM 31° Clear 3% 7 mph WSW 72%
9 PM 29° Clear 3% 6 mph SW 76%
10 PM 27° Clear 3% 6 mph SW 80%
11 PM 26° Clear 3% 6 mph SW 84%
12 AM 26° Clear 3% 6 mph SW 86%
1 AM 24° Clear 3% 6 mph SW 88%
2 AM 24° Clear 3% 6 mph SW 90%
3 AM 23° Clear 3% 6 mph WSW 91%
4 AM 23° Mostly Clear 3% 6 mph WSW 92%
5 AM 23° Mostly Clear 3% 6 mph W 92%
6 AM 22° Mostly Clear 3% 6 mph W 91%
7 AM 22° Mostly Clear 3% 5 mph WSW 90%
8 AM 24° Mostly Clear 3% 5 mph WSW 86%
9 AM 26° Mostly Clear 3% 6 mph W 80%
10 AM 28° Mostly Clear 3% 6 mph WSW 75%
11 AM 29° Mostly Clear 3% 6 mph WSW 70%
12 PM 29° Partly Cloudy 3% 6 mph WSW 67%
1 PM 32° Partly Cloudy 3% 7 mph WSW 64%
2 PM 33° Partly Cloudy 3% 7 mph SW 62%
3 PM 33° Partly Cloudy 3% 8 mph SW 62%
4 PM 33° Mostly Clear 3% 8 mph SW 62%
5 PM 34° Clear 3% 8 mph SW 62%
15-Day Forecast
Today
7/1
Clear
3%
22°
34°
Thu
7/2
Mostly Clear
3%
22°
34°
Fri
7/3
Partly Cloudy
55%
23°
34°
Sat
7/4
Mostly Cloudy
56%
22°
32°
Sun
7/5
Rain
64%
21°
31°
Mon
7/6
Rain
82%
21°
31°
Tue
7/7
Rain
64%
20°
28°
Wed
7/8
Rain
63%
19°
29°
Thu
7/9
Rain
68%
19°
28°
Fri
7/10
Rain
68%
18°
28°
Sat
7/11
Rain
77%
18°
28°
Sun
7/12
Drizzle
60%
18°
28°
Mon
7/13
Drizzle
60%
18°
28°
Tue
7/14
Drizzle
60%
18°
27°
Wed
7/15
Drizzle
60%
17°
26°
62
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
62 AQI 15.1 µg/m³
O3
Ground-level ozone
33 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 62 Moderate 33 62
Fri 52 Moderate 36 52
Sat 53 Moderate 36 53
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 1, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3479 J/kg
MLCAPE2497 J/kg
MUCAPE3479 J/kg
SBCIN-85 J/kg
MLCIN0 J/kg
Lifted Index-7.2
Kinematics
0–6 km Shear15 kt
0–1 km Shear4 kt
Eff. Shear9 kt
0–1 km SRH-1
0–3 km SRH-64
Eff. SRH-64
Storm Motion233° @ 25 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index21.9
Thermo & Levels
PWAT1.32 in
0–3 km LR6.8 °C/km
700–500 LR7.0 °C/km
Total Totals47.5
LCL851 hPa
LFC722 hPa
EL145 hPa
Freezing Lvl14,252 ft