Lancaster, Pennsylvania

Last updated: 3:54 AM CDT · Refresh

21°C

Feels like 23°

Rain

▲ 31° / ▼ 21°

Wind

6 mph ESE

Humidity

97%

Dew Point

20°

Pressure

29.59 inHg

Visibility

10 mi

UV Index

0.0

Cloud Cover

94%

Sunrise

6:34 AM

Sunset

7:33 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Lancaster is currently rain at 21°C. Precipitation is likely — peak probability 71% around 8 PM. Atmospheric instability is elevated (CAPE up to 3053 J/kg) — isolated convective development possible. Sunrise: 6:34AM · Sunset: 7:33PM.

54 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

21°

51%

5 AM

20°

32%

6 AM

20°

33%

7 AM

21°

28%

8 AM

22°

33%

9 AM

22°

16%

10 AM

24°

16%

11 AM

26°

26%

12 PM

27°

29%

1 PM

30°

29%

2 PM

31°

34%

3 PM

31°

41%

4 PM

31°

42%

5 PM

31°

54%

6 PM

29°

63%

7 PM

28°

66%

8 PM

27°

70%

9 PM

26°

70%

10 PM

25°

62%

11 PM

24°

50%

12 AM

24°

47%

1 AM

23°

38%

2 AM

23°

39%

3 AM

23°

39%

7-Day Forecast

Today

31° 21°

Partly Cloudy with a 66% chance of rain.

Fri

31° 19°

Partly Cloudy with a 43% chance of rain.

Sat

26° 15°

Mostly Cloudy.

Sun

22° 12°

Clear.

Mon

26° 14°

Clear.

Tue

27° 13°

Clear.

Wed

27° 17°

Rain, 41% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 21° Rain 51% 5 mph ESE 97%

5 AM 20° Overcast 32% 3 mph WSW 96%

6 AM 20° Mostly Cloudy 33% 3 mph WSW 96%

7 AM 21° Rain 28% 3 mph SW 96%

8 AM 22° Mostly Cloudy 33% 6 mph SSW 93%

9 AM 22° Mostly Cloudy 16% 7 mph SSW 88%

10 AM 24° Partly Cloudy 16% 7 mph SW 83%

11 AM 26° Partly Cloudy 26% 7 mph WSW 77%

12 PM 27° Mostly Clear 29% 8 mph WSW 71%

1 PM 30° Mostly Clear 29% 8 mph WSW 66%

2 PM 31° Mostly Clear 34% 8 mph W 65%

3 PM 31° Partly Cloudy 41% 7 mph W 67%

4 PM 31° Partly Cloudy 42% 7 mph WNW 68%

5 PM 31° Partly Cloudy 54% 6 mph W 71%

6 PM 29° Mostly Cloudy 63% 4 mph WSW 75%

7 PM 28° Overcast 66% 4 mph SW 78%

8 PM 27° Overcast 70% 5 mph SSW 81%

9 PM 26° Overcast 70% 5 mph SW 85%

10 PM 25° Rain 62% 6 mph SW 88%

11 PM 24° Rain 50% 6 mph SW 90%

12 AM 24° Overcast 47% 4 mph SW 92%

1 AM 23° Overcast 38% 4 mph SW 94%

2 AM 23° Mostly Cloudy 39% 4 mph WSW 95%

3 AM 23° Mostly Cloudy 39% 4 mph WSW 95%

15-Day Forecast

Today

9/3

Partly Cloudy

66%

21°

31°

Fri

9/4

Partly Cloudy

43%

19°

31°

Sat

9/5

Mostly Cloudy

14%

15°

26°

Sun

9/6

Clear

15%

12°

22°

Mon

9/7

Clear

14°

26°

Tue

9/8

Clear

17%

13°

27°

Wed

9/9

Rain

41%

17°

27°

Thu

9/10

Drizzle

43%

16°

31°

Fri

9/11

Drizzle

44%

12°

26°

Sat

9/12

Drizzle

51%

12°

25°

Sun

9/13

Drizzle

60%

17°

28°

Mon

9/14

Drizzle

60%

16°

28°

Tue

9/15

Clear

25%

14°

26°

Wed

9/16

Clear

60%

13°

26°

Thu

9/17

Drizzle

60%

14°

26°

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

54 AQI 10.9 µg/m³

O₃

Ground-level ozone

37 AQI 41 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Today 54 Moderate 37 54

Fri 46 Good 44 46

Sat 44 Good 37 44

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 Thu Sep 3, 07:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE109 J/kg

MLCAPE266 J/kg

MUCAPE1108 J/kg

SBCIN-231 J/kg

MLCIN-138 J/kg

Lifted Index-1.5

Kinematics

0–6 km Shear42 kt

0–1 km Shear19 kt

Eff. Shear42 kt

0–1 km SRH146

0–3 km SRH176

Eff. SRH176

Storm Motion302° @ 28 kt

0–1 km EHI0.1

Composite Parameters

Sig. Tornado0.1

STP (eff)0.1

Supercell4.2

K-Index37.6

Thermo & Levels

PWAT2.03 in

0–3 km LR4.2 °C/km

700–500 LR6.4 °C/km

Total Totals52.6

LCL992 hPa

LFC624 hPa

EL419 hPa

Freezing Lvl14,199 ft

Lancaster, Pennsylvania

Alerts