Downingtown, Pennsylvania

Last updated: 3:32 AM CDT  ·  Refresh
3°C
Feels like 0°
Mostly Clear
▲ 17°  /  ▼ 3°
Wind
2 mph NW
Humidity
80%
Dew Point
1°
Pressure
30.05 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
16%
Sunrise
7:23 AM
Sunset
6:10 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Downingtown is currently mostly clear at 3°C. Dry conditions are expected through the next 24 hours. Sunrise: 7:23AM · Sunset: 6:10PM.

Alerts

No active alerts for this location.
38 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
3°
6%
5 AM
2°
3%
6 AM
2°
3%
7 AM
2°
3%
8 AM
3°
3%
9 AM
7°
3%
10 AM
11°
3%
11 AM
12°
3%
12 PM
13°
3%
1 PM
17°
3%
2 PM
17°
3%
3 PM
17°
3%
4 PM
17°
3%
5 PM
14°
3%
6 PM
12°
3%
7 PM
11°
3%
8 PM
10°
3%
9 PM
9°
3%
10 PM
9°
3%
11 PM
8°
3%
12 AM
8°
3%
1 AM
7°
3%
2 AM
7°
3%
3 AM
7°
3%
7-Day Forecast
Today
17° 3°
Clear.
Sun
19° 4°
Clear.
Mon
22° 3°
Fog.
Tue
18° 6°
Fog.
Wed
18° 4°
Clear.
Thu
20° 7°
Clear.
Fri
24° 9°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 3° Mostly Clear 6% 2 mph NW 80%
5 AM 2° Mostly Clear 3% 3 mph NNW 76%
6 AM 2° Mostly Clear 3% 3 mph NNW 77%
7 AM 2° Mostly Clear 3% 3 mph NNW 78%
8 AM 3° Mostly Clear 3% 3 mph NNW 76%
9 AM 7° Clear 3% 3 mph NNW 68%
10 AM 11° Clear 3% 3 mph N 60%
11 AM 12° Clear 3% 2 mph NNW 54%
12 PM 13° Clear 3% 1 mph NW 49%
1 PM 17° Clear 3% 2 mph SSW 44%
2 PM 17° Clear 3% 2 mph S 44%
3 PM 17° Clear 3% 2 mph SSW 46%
4 PM 17° Clear 3% 2 mph SSW 48%
5 PM 14° Clear 3% 2 mph SW 51%
6 PM 12° Clear 3% 2 mph WSW 54%
7 PM 11° Clear 3% 2 mph SW 58%
8 PM 10° Clear 3% 3 mph SW 61%
9 PM 9° Clear 3% 3 mph WSW 63%
10 PM 9° Clear 3% 3 mph WSW 65%
11 PM 8° Clear 3% 3 mph WSW 67%
12 AM 8° Clear 3% 3 mph WSW 70%
1 AM 7° Clear 3% 3 mph WSW 73%
2 AM 7° Clear 3% 3 mph W 76%
3 AM 7° Clear 3% 3 mph W 78%
15-Day Forecast
Today
10/24
Clear
6%
3°
17°
Sun
10/25
Clear
3%
4°
19°
Mon
10/26
Fog
17%
3°
22°
Tue
10/27
Fog
3%
6°
18°
Wed
10/28
Clear
3%
4°
18°
Thu
10/29
Clear
3%
7°
20°
Fri
10/30
Clear
3%
9°
24°
Sat
10/31
Clear
3%
9°
22°
Sun
11/1
Drizzle
44%
9°
21°
Mon
11/2
Rain
77%
9°
21°
Tue
11/3
Drizzle
60%
10°
21°
Wed
11/4
Drizzle
60%
8°
18°
Thu
11/5
Drizzle
60%
7°
17°
Fri
11/6
Drizzle
60%
8°
19°
Sat
11/7
Drizzle
60%
8°
19°
38
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
38 AQI 6.9 µg/m³
O3
Ground-level ozone
27 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 38 Good 27 38
Sun 55 Moderate 33 55
Mon 53 Moderate 32 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 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sat Oct 24, 07:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE20 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index22.0
Kinematics
0–6 km Shear12 kt
0–1 km Shear7 kt
Eff. Shear—
0–1 km SRH-35
0–3 km SRH-15
Eff. SRH—
Storm Motion32° @ 17 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-51.2
Thermo & Levels
PWAT0.27 in
0–3 km LR1.0 °C/km
700–500 LR6.7 °C/km
Total Totals8.5
LCL980 hPa
LFC—
EL—
Freezing Lvl9,738 ft