Flash Flood Warning — Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA 7:45 PM Heat Advisory — Northern Hancock, MS, Northern Harrison, MS, Northern Jackson, MS, Southern Hancock, MS, Southern Harrison, MS, Southern Jackson, MS 8:00 PM

Philadelphia, Pennsylvania

Last updated: 6:06 PM CDT  ·  Refresh
25°C
Feels like 28°
Overcast
▲ 30°  /  ▼ 22°
Wind
9 mph SSW
Humidity
90%
Dew Point
23°
Pressure
29.62 inHg
Visibility
2 mi
UV Index
1.4
Cloud Cover
92%
Sunrise
5:49 AM
Sunset
8:24 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Philadelphia is currently overcast at 25°C. Precipitation is likely — peak probability 72% around 8 PM. Atmospheric instability is elevated (CAPE up to 1512 J/kg) — isolated convective development possible. Sunrise: 5:49AM · Sunset: 8:24PM.

Alerts

Flash Flood Warning
Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
Expires 7:45 PM
Heat Advisory
Northern Hancock, MS, Northern Harrison, MS, Northern Jackson, MS, Southern Hancock, MS, Southern Harrison, MS, Southern Jackson, MS
Expires 8:00 PM
78 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
68%
8 PM
26°
72%
9 PM
24°
54%
10 PM
24°
56%
11 PM
25°
54%
12 AM
24°
55%
1 AM
24°
61%
2 AM
23°
64%
3 AM
23°
49%
4 AM
23°
45%
5 AM
22°
46%
6 AM
22°
46%
7 AM
23°
51%
8 AM
23°
51%
9 AM
24°
51%
10 AM
26°
36%
11 AM
26°
33%
12 PM
26°
33%
1 PM
28°
45%
2 PM
28°
45%
3 PM
28°
44%
4 PM
29°
34%
5 PM
28°
34%
6 PM
28°
34%
7-Day Forecast
Tonight
30° 22°
Overcast with a 68% chance of rain.
Wed
31° 22°
Rain, 61% chance.
Thu
29° 19°
Mostly Clear with a 26% chance of rain.
Fri
29° 18°
Fog.
Sat
31° 18°
Partly Cloudy.
Sun
31° 19°
Rain, 71% chance.
Mon
32° 21°
Drizzle, 60% chance.
TimeTempConditionsPrecipWindHumidity
Now 25° Overcast 68% 9 mph SSW 90%
8 PM 26° Rain 72% 11 mph S 93%
9 PM 24° Overcast 54% 8 mph SSW 93%
10 PM 24° Overcast 56% 8 mph SSW 93%
11 PM 25° Mostly Cloudy 54% 9 mph SW 93%
12 AM 24° Mostly Cloudy 55% 9 mph SW 92%
1 AM 24° Rain 61% 10 mph SSW 91%
2 AM 23° Overcast 64% 9 mph SSW 90%
3 AM 23° Drizzle 49% 9 mph SSW 91%
4 AM 23° Mostly Cloudy 45% 10 mph SSW 93%
5 AM 22° Mostly Cloudy 46% 9 mph SSW 92%
6 AM 22° Partly Cloudy 46% 10 mph SSW 89%
7 AM 23° Rain 51% 10 mph SW 87%
8 AM 23° Rain 51% 9 mph SW 84%
9 AM 24° Mostly Clear 51% 9 mph WSW 79%
10 AM 26° Mostly Clear 36% 9 mph WSW 74%
11 AM 26° Mostly Clear 33% 10 mph W 69%
12 PM 26° Partly Cloudy 33% 10 mph W 67%
1 PM 28° Partly Cloudy 45% 10 mph W 66%
2 PM 28° Partly Cloudy 45% 10 mph W 66%
3 PM 28° Partly Cloudy 44% 10 mph W 62%
4 PM 29° Mostly Clear 34% 10 mph W 59%
5 PM 28° Mostly Clear 34% 9 mph W 56%
6 PM 28° Mostly Clear 34% 8 mph W 58%
15-Day Forecast
Today
7/21
Overcast
68%
22°
30°
Wed
7/22
Rain
61%
22°
31°
Thu
7/23
Mostly Clear
26%
19°
29°
Fri
7/24
Fog
15%
18°
29°
Sat
7/25
Partly Cloudy
8%
18°
31°
Sun
7/26
Rain
71%
19°
31°
Mon
7/27
Drizzle
60%
21°
32°
Tue
7/28
Drizzle
63%
21°
31°
Wed
7/29
Drizzle
68%
20°
29°
Thu
7/30
Drizzle
68%
21°
31°
Fri
7/31
Drizzle
46%
22°
32°
Sat
8/1
Drizzle
60%
22°
31°
Sun
8/2
Drizzle
60%
21°
32°
Mon
8/3
Drizzle
60%
22°
31°
Tue
8/4
Drizzle
60%
22°
32°
78
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
78 AQI 23.9 µg/m³
O3
Ground-level ozone
40 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 78 Moderate 40 78
Thu 56 Moderate 44 56
Fri 54 Moderate 49 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 Tue Jul 21, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1341 J/kg
MLCAPE1214 J/kg
MUCAPE1426 J/kg
SBCIN-48 J/kg
MLCIN0 J/kg
Lifted Index-4.7
Kinematics
0–6 km Shear37 kt
0–1 km Shear10 kt
Eff. Shear37 kt
0–1 km SRH-34
0–3 km SRH-114
Eff. SRH-114
Storm Motion218° @ 34 kt
0–1 km EHI-0.3
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index36.6
Thermo & Levels
PWAT2.20 in
0–3 km LR5.5 °C/km
700–500 LR5.8 °C/km
Total Totals48.0
LCL970 hPa
LFC825 hPa
EL192 hPa
Freezing Lvl13,963 ft