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: 3:55 PM CDT  ·  Refresh
33°C
Feels like 40°
Clear
▲ 34°  /  ▼ 21°
Wind
10 mph SW
Humidity
58%
Dew Point
23°
Pressure
29.00 inHg
Visibility
8 mi
UV Index
7.9
Cloud Cover
2%
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 34°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3494 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%
5 PM
34°
3%
6 PM
33°
3%
7 PM
32°
3%
8 PM
29°
3%
9 PM
27°
3%
10 PM
26°
3%
11 PM
26°
3%
12 AM
24°
3%
1 AM
24°
3%
2 AM
23°
3%
3 AM
23°
3%
4 AM
23°
3%
5 AM
21°
3%
6 AM
22°
3%
7 AM
23°
3%
8 AM
25°
3%
9 AM
27°
3%
10 AM
28°
3%
11 AM
31°
3%
12 PM
31°
3%
1 PM
32°
3%
2 PM
32°
3%
3 PM
32°
3%
7-Day Forecast
Today
34° 21°
Clear.
Thu
34° 21°
Mostly Clear.
Fri
36° 23°
Mostly Clear with a 56% chance of rain.
Sat
32° 22°
Mostly Cloudy with a 43% chance of rain.
Sun
32° 22°
Rain, 64% chance.
Mon
31° 21°
Rain, 64% chance.
Tue
29° 20°
Rain, 28% chance.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 3% 10 mph SW 58%
5 PM 34° Clear 3% 10 mph SW 61%
6 PM 33° Clear 3% 9 mph SW 65%
7 PM 32° Clear 3% 8 mph WSW 70%
8 PM 29° Clear 3% 7 mph WSW 75%
9 PM 27° Clear 3% 6 mph SW 80%
10 PM 26° Clear 3% 6 mph SW 83%
11 PM 26° Clear 3% 6 mph SW 85%
12 AM 24° Clear 3% 6 mph SW 87%
1 AM 24° Clear 3% 6 mph SW 89%
2 AM 23° Clear 3% 6 mph WSW 90%
3 AM 23° Mostly Clear 3% 6 mph WSW 91%
4 AM 23° Mostly Clear 3% 6 mph WSW 92%
5 AM 21° Mostly Clear 3% 6 mph WSW 91%
6 AM 22° Mostly Clear 3% 5 mph WSW 90%
7 AM 23° Mostly Clear 3% 5 mph WSW 87%
8 AM 25° Mostly Clear 3% 6 mph WSW 82%
9 AM 27° Mostly Clear 3% 6 mph WSW 77%
10 AM 28° Partly Cloudy 3% 6 mph W 73%
11 AM 31° Partly Cloudy 3% 7 mph WSW 70%
12 PM 31° Partly Cloudy 3% 7 mph WSW 67%
1 PM 32° Partly Cloudy 3% 7 mph WSW 64%
2 PM 32° Partly Cloudy 3% 8 mph WSW 64%
3 PM 32° Mostly Clear 3% 9 mph WSW 64%
15-Day Forecast
Today
7/1
Clear
3%
21°
34°
Thu
7/2
Mostly Clear
3%
21°
34°
Fri
7/3
Mostly Clear
56%
23°
36°
Sat
7/4
Mostly Cloudy
43%
22°
32°
Sun
7/5
Rain
64%
22°
32°
Mon
7/6
Rain
64%
21°
31°
Tue
7/7
Rain
28%
20°
29°
Wed
7/8
Rain
69%
19°
29°
Thu
7/9
Rain
68%
18°
29°
Fri
7/10
Rain
68%
18°
29°
Sat
7/11
Rain
77%
18°
28°
Sun
7/12
Drizzle
60%
18°
28°
Mon
7/13
Drizzle
60%
18°
29°
Tue
7/14
Drizzle
60%
18°
28°
Wed
7/15
Drizzle
60%
17°
27°
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, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3943 J/kg
MLCAPE2829 J/kg
MUCAPE3943 J/kg
SBCIN0 J/kg
MLCIN-0 J/kg
Lifted Index-7.8
Kinematics
0–6 km Shear12 kt
0–1 km Shear2 kt
Eff. Shear6 kt
0–1 km SRH2
0–3 km SRH-59
Eff. SRH-59
Storm Motion229° @ 24 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index20.8
Thermo & Levels
PWAT1.34 in
0–3 km LR7.1 °C/km
700–500 LR6.9 °C/km
Total Totals47.4
LCL844 hPa
LFC982 hPa
EL138 hPa
Freezing Lvl14,170 ft