Today | Weather | Wednesday, August 12, 2026

Weather in Lancaster, Pennsylvania

07:51 AM
Now
Cloudy Weather
72° F
Feels Like 75°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 2
Humidity 85 %
Today
Cloudy Weather
Day 84°
Night 68°
Precipitation 25 %
Wind 6 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Lancaster Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 12, 2025)

Day

91°

Night

66°

Air Quality in Lancaster

NOW
21 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 5.03 µg/m³
PM10 5.63 µg/m³
O3 0.008 ppm
NO2 5.5 ppb
SO2 0.8 ppb
CO 0.16 ppm
NH3 0.24 µg/m³
NO 1.18 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.55.03 µg/m³
PM105.63 µg/m³
O316.03 µg/m³
NO210.44 µg/m³
SO22.22 µg/m³
CO188.43 µg/m³
NH30.24 µg/m³
NO1.18 µg/m³