Excessive Heat Warning — Western Pima County Including Ajo/Organ Pipe Cactus National Monument, AZ, Tohono O'odham Nation including Sells, AZ, Tucson Metro Area including Tucson/Green Valley/Marana/Vail, AZ, South Central Pinal County including Eloy/Picacho Peak State Park, AZ, Southeast Pinal County including Kearny/Mammoth/Oracle, AZ, Upper Gila River and Aravaipa Valleys including Clifton/Safford, AZ, Upper Santa Cruz River and Altar Valleys including Nogales, AZ, Upper San Pedro River Valley including Sierra Vista/Benson, AZ, Eastern Cochise County Below 5000 Feet including Douglas/Willcox, AZ 10:00 PM

Upper San Pedro River Valley including Sierra Vista/Benson, AZ

Last updated: 6:13 PM CDT  ·  Refresh
32°C
Feels like 41°
Mostly Clear
▲ 34°  /  ▼ 26°
Wind
14 mph NE
Humidity
67%
Dew Point
25°
Pressure
29.69 inHg
Visibility
10 mi
UV Index
4.8
Cloud Cover
27%
Sunrise
6:17 AM
Sunset
8:05 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Upper San Pedro River Valley including Sierra Vista/Benson is currently mostly clear at 32°C. Precipitation is likely — peak probability 63% around 7 AM. Atmospheric instability is elevated (CAPE up to 1952 J/kg) — isolated convective development possible. Sunrise: 6:17AM · Sunset: 8:05PM.

Alerts

Excessive Heat Warning
Western Pima County Including Ajo/Organ Pipe Cactus National Monument, AZ, Tohono O'odham Nation including Sells, AZ, Tucson Metro Area including Tucson/Green Valley/Marana/Vail, AZ, South Central Pinal County including Eloy/Picacho Peak State Park, AZ, Southeast Pinal County including Kearny/Mammoth/Oracle, AZ, Upper Gila River and Aravaipa Valleys including Clifton/Safford, AZ, Upper Santa Cruz River and Altar Valleys including Nogales, AZ, Upper San Pedro River Valley including Sierra Vista/Benson, AZ, Eastern Cochise County Below 5000 Feet including Douglas/Willcox, AZ
Expires 10:00 PM
42 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
14%
7 PM
32°
24%
8 PM
31°
24%
9 PM
29°
19%
10 PM
28°
24%
11 PM
28°
24%
12 AM
28°
31%
1 AM
28°
25%
2 AM
28°
24%
3 AM
27°
32%
4 AM
27°
32%
5 AM
26°
45%
6 AM
26°
57%
7 AM
26°
62%
8 AM
27°
51%
9 AM
27°
49%
10 AM
28°
38%
11 AM
28°
39%
12 PM
29°
36%
1 PM
31°
36%
2 PM
31°
36%
3 PM
32°
32%
4 PM
32°
24%
5 PM
32°
27%
7-Day Forecast
Tonight
34° 26°
Mostly Clear.
Thu
34° 26°
Partly Cloudy with a 57% chance of rain.
Fri
36° 24°
Mostly Clear with a 28% chance of rain.
Sat
36° 24°
Partly Cloudy.
Sun
36° 24°
Mostly Clear.
Mon
37° 24°
Partly Cloudy.
Tue
37° 24°
Partly Cloudy.
TimeTempConditionsPrecipWindHumidity
Now 32° Mostly Clear 14% 14 mph NE 67%
7 PM 32° Partly Cloudy 24% 13 mph NE 71%
8 PM 31° Mostly Clear 24% 12 mph NE 75%
9 PM 29° Partly Cloudy 19% 12 mph ENE 79%
10 PM 28° Partly Cloudy 24% 12 mph ENE 82%
11 PM 28° Partly Cloudy 24% 12 mph ENE 83%
12 AM 28° Mostly Cloudy 31% 12 mph ENE 84%
1 AM 28° Mostly Cloudy 25% 11 mph ENE 85%
2 AM 28° Partly Cloudy 24% 11 mph E 86%
3 AM 27° Mostly Cloudy 32% 12 mph E 86%
4 AM 27° Mostly Cloudy 32% 12 mph E 87%
5 AM 26° Mostly Cloudy 45% 12 mph E 87%
6 AM 26° Mostly Cloudy 57% 12 mph ESE 88%
7 AM 26° Partly Cloudy 62% 12 mph ESE 86%
8 AM 27° Mostly Cloudy 51% 12 mph SE 82%
9 AM 27° Mostly Cloudy 49% 12 mph SE 78%
10 AM 28° Rain 38% 12 mph SE 74%
11 AM 28° Rain 39% 12 mph SE 72%
12 PM 29° Rain 36% 13 mph SE 72%
1 PM 31° Rain 36% 13 mph SSE 70%
2 PM 31° Mostly Cloudy 36% 12 mph SSE 66%
3 PM 32° Partly Cloudy 32% 12 mph SSE 62%
4 PM 32° Partly Cloudy 24% 12 mph SSE 60%
5 PM 32° Mostly Clear 27% 11 mph SSE 62%
15-Day Forecast
Today
7/22
Mostly Clear
19%
26°
34°
Thu
7/23
Partly Cloudy
57%
26°
34°
Fri
7/24
Mostly Clear
28%
24°
36°
Sat
7/25
Partly Cloudy
7%
24°
36°
Sun
7/26
Mostly Clear
7%
24°
36°
Mon
7/27
Partly Cloudy
15%
24°
37°
Tue
7/28
Partly Cloudy
14%
24°
37°
Wed
7/29
Partly Cloudy
8%
24°
37°
Thu
7/30
Drizzle
47%
24°
37°
Fri
7/31
Overcast
47%
24°
37°
Sat
8/1
Drizzle
56%
24°
38°
Sun
8/2
Drizzle
60%
24°
38°
Mon
8/3
Rain
90%
24°
36°
Tue
8/4
Drizzle
60%
24°
35°
Wed
8/5
Drizzle
60%
24°
36°
42
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
42 AQI 7.7 µg/m³
O3
Ground-level ozone
26 AQI 28 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 42 Good 26 42
Fri 50 Good 24 50
Sat 55 Moderate 24 55
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 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2518 J/kg
MLCAPE2072 J/kg
MUCAPE2548 J/kg
SBCIN-24 J/kg
MLCIN0 J/kg
Lifted Index-2.4
Kinematics
0–6 km Shear18 kt
0–1 km Shear17 kt
Eff. Shear15 kt
0–1 km SRH-47
0–3 km SRH-62
Eff. SRH-62
Storm Motion16° @ 37 kt
0–1 km EHI-0.7
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.9
Thermo & Levels
PWAT2.49 in
0–3 km LR6.8 °C/km
700–500 LR4.4 °C/km
Total Totals39.8
LCL898 hPa
LFC879 hPa
EL127 hPa
Freezing Lvl19,219 ft