North Region Illinois forecast zone
Best window: Monday 2:00 AM-4:00 AM CDT
Regional darkness proxy: 93%
Clear skies
State decision view
Illinois
Is Illinois good for stargazing tonight?
Yes. Illinois is worth planning around tonight, especially during Monday 2:00 AM-4:00 AM CDT.
Worth it tonight
Broad conditions score: 95 (Great)
Best window: Monday 2:00 AM-4:00 AM CDT
Main reason: Clear window with strong viewing conditions.
Forecast details
Forecast updated Aug 3
Generated: Monday, Aug 03, 2026, 4:40 AM UTC
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Inspect North Region Illinois forecast zone for broad conditions, then verify an actual observing site's weather and access before leaving.
Regional forecast sample: North Region Illinois forecast zone. Use it to inspect a broad area, not as a ranked observing destination.
More planning links
Why this score (95)
Clouds: 3%
Moon illumination: 87%
Broad darkness estimate: Darkness 95%
Light pollution: Low
Transparency: High
Light pollution note: Dark enough for faint targets.
Moon note: This is the statewide illuminated fraction, not a coordinate- and hour-specific interference percentage.
Confidence: High
Regional forecast samples in this state
Broad planning samples, not ranked observing destinations
Illinois map
State map updated 2026-08-03
Central Region Illinois forecast zone
Best window: Monday 2:00 AM-4:00 AM CDT
Regional darkness proxy: 94%
Clear skies
South Region Illinois forecast zone
Best window: Monday 2:00 AM-4:00 AM CDT
Regional darkness proxy: 95%
Clear skies
Planning beyond tonight
Longer-range state guidance
A verified seven-night state series is not available in this feed yet. Recheck each day as the next night enters the reliable forecast window.
Guides for this state
Practical reads before local execution