The Star WindowMap-first stargazing decisionsData: 2026-05-20 (Fresh)

Data: 2026-05-20 (Fresh)

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City stargazing forecast

South Region Pennsylvania

Likely skip tonight

City-level planning view for South Region Pennsylvania.

Use this page to verify tonight's best window before committing to travel.

State: Pennsylvania

Tonight score: 38

Best window: Wednesday 11:00 PM-2:00 AM EDT

Main factor: CLOUD_CAP

View full location pageParent state forecastView on mapStargazing forecast tonightMilky Way in this state

Why tonight

Decision factors that drive the score

Clouds: 90%

Moon interference: 53%

Darkness: 94%

Light pollution: Low

Darkness class: B2

Excellent dark sky. Milky Way structure is strong.

Best nights this week

South Region Pennsylvania planning strip

Thursday

67

Good

Friday

66

Good

Saturday

64

Okay

Sunday

62

Okay

Monday

60

Poor

Tuesday

65

Okay

Wednesday

66

Good

FAQ

South Region Pennsylvania quick planning guidance

Is South Region Pennsylvania worth it tonight?

Conditions are mixed, so this is more timing-sensitive tonight.

What is the biggest limiter here tonight?

CLOUD_CAP. Compare nearby options before driving if your margin is tight.