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: 8:28 PM CDT  ·  Refresh
31°C
Feels like 35°
Clear
▲ 38°  /  ▼ 24°
Wind
6 mph SW
Humidity
60%
Dew Point
23°
Pressure
29.54 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
2%
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 31°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2584 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
31°
11%
10 PM
30°
21%
11 PM
29°
21%
12 AM
29°
21%
1 AM
28°
21%
2 AM
27°
3%
3 AM
27°
3%
4 AM
26°
3%
5 AM
24°
3%
6 AM
24°
3%
7 AM
27°
3%
8 AM
28°
8%
9 AM
31°
16%
10 AM
32°
17%
11 AM
33°
17%
12 PM
34°
17%
1 PM
36°
17%
2 PM
37°
20%
3 PM
37°
20%
4 PM
38°
25%
5 PM
38°
25%
6 PM
37°
25%
7 PM
36°
26%
8 PM
34°
26%
7-Day Forecast
Tonight
38° 24°
Clear.
Fri
38° 24°
Clear with a 29% chance of rain.
Sat
37° 23°
Mostly Clear with a 61% chance of rain.
Sun
32° 22°
Partly Cloudy with a 86% chance of rain.
Mon
31° 21°
Heavy Rain, 90% chance.
Tue
31° 20°
Rain, 69% chance.
Wed
30° 20°
Rain, 29% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Clear 11% 6 mph SW 60%
10 PM 30° Clear 21% 6 mph WSW 59%
11 PM 29° Clear 21% 6 mph WSW 59%
12 AM 29° Clear 21% 5 mph W 62%
1 AM 28° Clear 21% 5 mph WNW 64%
2 AM 27° Clear 3% 5 mph WNW 68%
3 AM 27° Clear 3% 5 mph WNW 71%
4 AM 26° Clear 3% 4 mph NW 74%
5 AM 24° Clear 3% 4 mph WNW 77%
6 AM 24° Clear 3% 4 mph WNW 75%
7 AM 27° Clear 3% 4 mph WNW 72%
8 AM 28° Clear 8% 5 mph WNW 66%
9 AM 31° Clear 16% 5 mph WNW 61%
10 AM 32° Clear 17% 6 mph WNW 56%
11 AM 33° Clear 17% 6 mph W 52%
12 PM 34° Clear 17% 8 mph W 50%
1 PM 36° Clear 17% 10 mph W 47%
2 PM 37° Clear 20% 10 mph W 45%
3 PM 37° Clear 20% 10 mph W 43%
4 PM 38° Clear 25% 10 mph W 42%
5 PM 38° Clear 25% 10 mph W 43%
6 PM 37° Clear 25% 8 mph W 48%
7 PM 36° Clear 26% 8 mph W 52%
8 PM 34° Mostly Clear 26% 7 mph W 56%
15-Day Forecast
Today
7/2
Clear
11%
24°
38°
Fri
7/3
Clear
29%
24°
38°
Sat
7/4
Mostly Clear
61%
23°
37°
Sun
7/5
Partly Cloudy
86%
22°
32°
Mon
7/6
Heavy Rain
90%
21°
31°
Tue
7/7
Rain
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%
18°
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 17.8 µg/m³
O3
Ground-level ozone
Dominant
84 AQI 66 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 84 Moderate 84 67
Sat 64 Moderate 64 58
Sun 67 Moderate 67 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 Thu Jul 2, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2285 J/kg
MLCAPE1947 J/kg
MUCAPE2285 J/kg
SBCIN-299 J/kg
MLCIN0 J/kg
Lifted Index-5.7
Kinematics
0–6 km Shear21 kt
0–1 km Shear13 kt
Eff. Shear14 kt
0–1 km SRH17
0–3 km SRH-21
Eff. SRH-54
Storm Motion261° @ 24 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.0
K-Index28.2
Thermo & Levels
PWAT1.64 in
0–3 km LR5.8 °C/km
700–500 LR6.8 °C/km
Total Totals50.5
LCL891 hPa
LFC700 hPa
EL152 hPa
Freezing Lvl15,013 ft