Next 24 hours

US AQI

45Now
46
46
4712 PM
48
48
493 PM
49
49
496 PM
47
45
439 PM
42
41
3912 AM
39
38
373 AM
37
37
376 AM
37
37

Air quality outlook

Worst hour each day

Today49Good
Sat 1053Moderate
Sun 1147Good
Mon 1282Moderate
Tue 1341Good

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

Live radar

Open full map

About Lancaster weather

Lancaster is in Lancaster County, Pennsylvania, United States at 40.04°, -76.31°. Right now it’s 50° and clear; today’s high is 68° with a 0% chance of rain.

Pennsylvania has a humid continental climate with distinct seasonal changes that vary significantly across the state's diverse topography. The southeastern lowlands around Philadelphia experience milder winters and hotter summers than the mountainous interior. The Appalachian Mountains running through the center of the state create orographic effects that enhance precipitation and generate temperature contrasts between the eastern and western slopes.