Downingtown, Pennsylvania

Last updated: 4:28 PM CDT · Refresh

26°C

Feels like 29°

Overcast

▲ 28° / ▼ 21°

Wind

7 mph SW

Humidity

88%

Dew Point

23°

Pressure

29.30 inHg

Visibility

10 mi

UV Index

2.5

Cloud Cover

93%

Sunrise

5:51 AM

Sunset

8:26 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Downingtown is currently overcast at 26°C. Precipitation is likely — peak probability 74% around 5 PM. Atmospheric instability is elevated (CAPE up to 1561 J/kg) — isolated convective development possible. Sunrise: 5:51AM · Sunset: 8:26PM.

70 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

26°

73%

6 PM

26°

49%

7 PM

26°

51%

8 PM

24°

53%

9 PM

24°

50%

10 PM

23°

52%

11 PM

23°

53%

12 AM

23°

39%

1 AM

22°

44%

2 AM

22°

35%

3 AM

22°

35%

4 AM

21°

35%

5 AM

21°

35%

6 AM

21°

35%

7 AM

22°

35%

8 AM

23°

41%

9 AM

24°

40%

10 AM

24°

28%

11 AM

24°

33%

12 PM

27°

37%

1 PM

27°

34%

2 PM

27°

34%

3 PM

27°

34%

4 PM

27°

34%

7-Day Forecast

Today

28° 21°

Overcast with a 73% chance of rain.

Wed

29° 18°

Mostly Clear with a 41% chance of rain.

Thu

28° 16°

Mostly Clear.

Fri

28° 17°

Partly Cloudy.

Sat

29° 16°

Clear.

Sun

29° 17°

Rain, 81% chance.

Mon

30° 18°

Drizzle, 60% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 26° Overcast 73% 7 mph SW 88%

6 PM 26° Overcast 49% 7 mph SSW 91%

7 PM 26° Overcast 51% 9 mph S 92%

8 PM 24° Overcast 53% 10 mph S 93%

9 PM 24° Overcast 50% 9 mph SSW 93%

10 PM 23° Overcast 52% 8 mph SSW 94%

11 PM 23° Rain 53% 9 mph SSW 93%

12 AM 23° Mostly Cloudy 39% 9 mph SSW 92%

1 AM 22° Partly Cloudy 44% 9 mph SW 91%

2 AM 22° Partly Cloudy 35% 9 mph SSW 92%

3 AM 22° Partly Cloudy 35% 10 mph SSW 93%

4 AM 21° Mostly Cloudy 35% 9 mph SSW 94%

5 AM 21° Partly Cloudy 35% 8 mph SSW 94%

6 AM 21° Partly Cloudy 35% 8 mph SW 92%

7 AM 22° Rain 35% 8 mph SW 89%

8 AM 23° Partly Cloudy 41% 9 mph WSW 85%

9 AM 24° Partly Cloudy 40% 9 mph W 81%

10 AM 24° Mostly Clear 28% 10 mph W 76%

11 AM 24° Mostly Clear 33% 10 mph W 71%

12 PM 27° Mostly Clear 37% 10 mph W 68%

1 PM 27° Mostly Clear 34% 10 mph W 64%

2 PM 27° Mostly Clear 34% 10 mph W 62%

3 PM 27° Mostly Clear 34% 10 mph W 62%

4 PM 27° Mostly Clear 34% 11 mph W 61%

15-Day Forecast

Today

7/21

Overcast

73%

21°

28°

Wed

7/22

Mostly Clear

41%

18°

29°

Thu

7/23

Mostly Clear

16°

28°

Fri

7/24

Partly Cloudy

17°

28°

Sat

7/25

Clear

19%

16°

29°

Sun

7/26

Rain

81%

17°

29°

Mon

7/27

Drizzle

60%

18°

30°

Tue

7/28

Drizzle

60%

18°

29°

Wed

7/29

Drizzle

60%

17°

27°

Thu

7/30

Drizzle

60%

18°

29°

Fri

7/31

Drizzle

60%

19°

29°

Sat

8/1

Drizzle

60%

19°

29°

Sun

8/2

Drizzle

60%

19°

30°

Mon

8/3

Drizzle

60%

20°

29°

Tue

8/4

Drizzle

60%

20°

31°

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

PM_2.5

Fine particulate matter

Dominant

70 AQI 19.3 µg/m³

O₃

Ground-level ozone

35 AQI 39 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Wed 70 Moderate 35 70

Thu 50 Good 40 50

Fri 52 Moderate 44 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. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Tue Jul 21, 20:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE2187 J/kg

MLCAPE1625 J/kg

MUCAPE2187 J/kg

SBCIN0 J/kg

MLCIN0 J/kg

Lifted Index-5.5

Kinematics

0–6 km Shear35 kt

0–1 km Shear13 kt

Eff. Shear35 kt

0–1 km SRH-43

0–3 km SRH-99

Eff. SRH-99

Storm Motion214° @ 34 kt

0–1 km EHI-0.6

Composite Parameters

Sig. Tornado0.0

STP (eff)0.0

Supercell0.0

K-Index37.0

Thermo & Levels

PWAT2.26 in

0–3 km LR6.4 °C/km

700–500 LR5.2 °C/km

Total Totals49.2

LCL951 hPa

LFC992 hPa

EL174 hPa

Freezing Lvl13,780 ft

Downingtown, Pennsylvania

Alerts