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: 9:28 PM CDT  ·  Refresh
29°C
Feels like 33°
Clear
▲ 38°  /  ▼ 24°
Wind
5 mph SW
Humidity
62%
Dew Point
23°
Pressure
29.56 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
3%
Sunrise
5:38 AM
Sunset
8:35 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Downingtown is currently clear at 30°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2701 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
84 AQI · Moderate Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
29°
3%
11 PM
29°
21%
12 AM
29°
21%
1 AM
27°
21%
2 AM
27°
3%
3 AM
27°
3%
4 AM
26°
3%
5 AM
24°
3%
6 AM
24°
3%
7 AM
26°
3%
8 AM
28°
8%
9 AM
31°
16%
10 AM
32°
16%
11 AM
33°
17%
12 PM
34°
17%
1 PM
36°
17%
2 PM
37°
27%
3 PM
37°
31%
4 PM
37°
35%
5 PM
37°
36%
6 PM
36°
36%
7 PM
34°
32%
8 PM
33°
26%
9 PM
31°
26%
7-Day Forecast
Tonight
38° 24°
Clear.
Fri
37° 24°
Clear with a 35% chance of rain.
Sat
37° 23°
Mostly Clear with a 61% chance of rain.
Sun
32° 22°
Partly Cloudy with a 82% chance of rain.
Mon
31° 21°
Heavy Rain, 90% chance.
Tue
31° 20°
Drizzle, 69% chance.
Wed
30° 20°
Rain, 29% chance.
TimeTempConditionsPrecipWindHumidity
Now 29° Clear 3% 5 mph SW 62%
11 PM 29° Clear 21% 5 mph WSW 63%
12 AM 29° Clear 21% 5 mph W 65%
1 AM 27° Clear 21% 5 mph W 68%
2 AM 27° Clear 3% 5 mph WNW 70%
3 AM 27° Clear 3% 5 mph WNW 72%
4 AM 26° Clear 3% 4 mph NW 74%
5 AM 24° Clear 3% 4 mph NW 77%
6 AM 24° Clear 3% 4 mph WNW 75%
7 AM 26° Clear 3% 4 mph WNW 71%
8 AM 28° Clear 8% 5 mph WNW 65%
9 AM 31° Clear 16% 6 mph WNW 60%
10 AM 32° Clear 16% 6 mph WNW 56%
11 AM 33° Clear 17% 7 mph W 52%
12 PM 34° Clear 17% 8 mph W 49%
1 PM 36° Clear 17% 9 mph W 47%
2 PM 37° Clear 27% 10 mph W 44%
3 PM 37° Clear 31% 10 mph W 43%
4 PM 37° Mostly Clear 35% 11 mph W 42%
5 PM 37° Mostly Clear 36% 10 mph W 44%
6 PM 36° Mostly Clear 36% 9 mph W 51%
7 PM 34° Partly Cloudy 32% 9 mph W 58%
8 PM 33° Partly Cloudy 26% 8 mph W 62%
9 PM 31° Partly Cloudy 26% 7 mph W 63%
15-Day Forecast
Today
7/2
Clear
3%
24°
38°
Fri
7/3
Clear
35%
24°
37°
Sat
7/4
Mostly Clear
61%
23°
37°
Sun
7/5
Partly Cloudy
82%
22°
32°
Mon
7/6
Heavy Rain
90%
21°
31°
Tue
7/7
Drizzle
69%
20°
31°
Wed
7/8
Rain
29%
20°
30°
Thu
7/9
Rain
27%
19°
32°
Fri
7/10
Drizzle
69%
21°
32°
Sat
7/11
Drizzle
66%
21°
32°
Sun
7/12
Drizzle
60%
20°
35°
Mon
7/13
Drizzle
60%
19°
34°
Tue
7/14
Drizzle
60%
19°
31°
Wed
7/15
Drizzle
60%
19°
30°
Thu
7/16
Drizzle
60%
19°
31°
84
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
67 AQI 17.6 µg/m³
O3
Ground-level ozone
Dominant
84 AQI 66 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 84 Moderate 84 67
Sat 61 Moderate 61 58
Sun 67 Moderate 67 54
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 Fri Jul 3, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1940 J/kg
MLCAPE1963 J/kg
MUCAPE2389 J/kg
SBCIN-376 J/kg
MLCIN0 J/kg
Lifted Index-5.0
Kinematics
0–6 km Shear19 kt
0–1 km Shear14 kt
Eff. Shear12 kt
0–1 km SRH-1
0–3 km SRH-20
Eff. SRH-37
Storm Motion254° @ 22 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index26.9
Thermo & Levels
PWAT1.60 in
0–3 km LR5.3 °C/km
700–500 LR6.8 °C/km
Total Totals50.5
LCL907 hPa
LFC691 hPa
EL164 hPa
Freezing Lvl14,780 ft