Excessive Heat Watch 7:00 PM Excessive Heat Warning — Delaware, PA, Philadelphia, PA, Eastern Chester, PA, Eastern Montgomery, PA, Lower Bucks, PA, Kent, MD, Queen Anne's, MD, Talbot, MD, Caroline, MD, Berks, PA, Lehigh, PA, Northampton, PA, Western Chester, PA, Western Montgomery, PA, Upper Bucks, PA, Somerset, NJ, Middlesex, NJ, Western Monmouth, NJ, Eastern Monmouth, NJ, Ocean, NJ, Southeastern Burlington, NJ, Cumberland, NJ, Atlantic, NJ, Cape May, NJ, Carbon, PA, Monroe, PA, Atlantic Coastal Cape May, NJ, Coastal Atlantic, NJ, Coastal Ocean, NJ 7:00 PM

Downingtown, Pennsylvania

Last updated: 10:20 PM CDT  ·  Refresh
28°C
Feels like 32°
Mostly Clear
▲ 37°  /  ▼ 23°
Wind
3 mph WNW
Humidity
73%
Dew Point
22°
Pressure
29.54 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
24%
Sunrise
5:38 AM
Sunset
8:35 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Downingtown is currently mostly clear at 28°C. Precipitation is likely — peak probability 75% around 11 PM. Atmospheric instability is elevated (CAPE up to 1752 J/kg) — isolated convective development possible. Sunrise: 5:38AM · Sunset: 8:35PM.

Alerts

Excessive Heat Watch
Expires 7:00 PM
Excessive Heat Warning
Delaware, PA, Philadelphia, PA, Eastern Chester, PA, Eastern Montgomery, PA, Lower Bucks, PA, Kent, MD, Queen Anne's, MD, Talbot, MD, Caroline, MD, Berks, PA, Lehigh, PA, Northampton, PA, Western Chester, PA, Western Montgomery, PA, Upper Bucks, PA, Somerset, NJ, Middlesex, NJ, Western Monmouth, NJ, Eastern Monmouth, NJ, Ocean, NJ, Southeastern Burlington, NJ, Cumberland, NJ, Atlantic, NJ, Cape May, NJ, Carbon, PA, Monroe, PA, Atlantic Coastal Cape May, NJ, Coastal Atlantic, NJ, Coastal Ocean, NJ
Expires 7:00 PM
67 AQI · Moderate Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
28°
24%
12 AM
28°
40%
1 AM
26°
26%
2 AM
26°
7%
3 AM
26°
7%
4 AM
25°
7%
5 AM
23°
4%
6 AM
23°
4%
7 AM
25°
4%
8 AM
27°
9%
9 AM
29°
21%
10 AM
31°
21%
11 AM
32°
39%
12 PM
33°
44%
1 PM
36°
51%
2 PM
36°
55%
3 PM
34°
55%
4 PM
34°
56%
5 PM
34°
58%
6 PM
33°
71%
7 PM
31°
67%
8 PM
31°
65%
9 PM
28°
66%
10 PM
27°
71%
7-Day Forecast
Tonight
37° 23°
Mostly Clear with a 24% chance of rain.
Sat
36° 23°
Partly Cloudy with a 75% chance of rain.
Sun
33° 21°
Partly Cloudy with a 80% chance of rain.
Mon
28° 21°
Heavy Rain, 90% chance.
Tue
29° 20°
Rain, 68% chance.
Wed
29° 19°
Rain, 43% chance.
Thu
32° 21°
Rain, 35% chance.
TimeTempConditionsPrecipWindHumidity
Now 28° Mostly Clear 24% 3 mph WNW 73%
12 AM 28° Partly Cloudy 40% 3 mph W 76%
1 AM 26° Clear 26% 3 mph WNW 79%
2 AM 26° Clear 7% 3 mph WNW 81%
3 AM 26° Clear 7% 3 mph WNW 81%
4 AM 25° Clear 7% 3 mph WNW 82%
5 AM 23° Clear 4% 3 mph WNW 82%
6 AM 23° Mostly Clear 4% 3 mph WNW 79%
7 AM 25° Partly Cloudy 4% 4 mph W 76%
8 AM 27° Partly Cloudy 9% 5 mph WNW 70%
9 AM 29° Partly Cloudy 21% 6 mph WNW 63%
10 AM 31° Partly Cloudy 21% 7 mph WNW 56%
11 AM 32° Partly Cloudy 39% 8 mph WNW 50%
12 PM 33° Mostly Clear 44% 9 mph W 46%
1 PM 36° Partly Cloudy 51% 11 mph W 42%
2 PM 36° Partly Cloudy 55% 11 mph W 42%
3 PM 34° Partly Cloudy 55% 11 mph W 46%
4 PM 34° Partly Cloudy 56% 11 mph W 50%
5 PM 34° Mostly Cloudy 58% 10 mph WSW 55%
6 PM 33° Mostly Cloudy 71% 9 mph WSW 61%
7 PM 31° Overcast 67% 8 mph WSW 67%
8 PM 31° Overcast 65% 7 mph WSW 72%
9 PM 28° Overcast 66% 7 mph W 76%
10 PM 27° Heavy Rain 71% 8 mph WNW 81%
15-Day Forecast
Today
7/3
Mostly Clear
24%
23°
37°
Sat
7/4
Partly Cloudy
75%
23°
36°
Sun
7/5
Partly Cloudy
80%
21°
33°
Mon
7/6
Heavy Rain
90%
21°
28°
Tue
7/7
Rain
68%
20°
29°
Wed
7/8
Rain
43%
19°
29°
Thu
7/9
Rain
35%
21°
32°
Fri
7/10
Rain
41%
20°
31°
Sat
7/11
Drizzle
44%
19°
31°
Sun
7/12
Rain
68%
19°
31°
Mon
7/13
Drizzle
60%
19°
30°
Tue
7/14
Drizzle
60%
18°
31°
Wed
7/15
Drizzle
60%
19°
31°
Thu
7/16
Rain
90%
20°
31°
Fri
7/17
Drizzle
60%
19°
31°
67
Moderate
U.S. Air Quality Index · Dominant: O3
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
58 AQI 12.6 µg/m³
O3
Ground-level ozone
Dominant
67 AQI 61 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 67 Moderate 67 58
Sun 58 Moderate 58 54
Mon 61 Moderate 61 52
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 Sat Jul 4, 02:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1268 J/kg
MLCAPE1293 J/kg
MUCAPE2717 J/kg
SBCIN-243 J/kg
MLCIN0 J/kg
Lifted Index-4.9
Kinematics
0–6 km Shear24 kt
0–1 km Shear10 kt
Eff. Shear27 kt
0–1 km SRH-12
0–3 km SRH-42
Eff. SRH-42
Storm Motion247° @ 22 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index35.9
Thermo & Levels
PWAT2.05 in
0–3 km LR5.7 °C/km
700–500 LR6.8 °C/km
Total Totals55.5
LCL907 hPa
LFC761 hPa
EL203 hPa
Freezing Lvl14,774 ft