North Region Arizona forecast zone
State: Arizona
Score: 91 (Great)
Best window: Thursday 10:00 PM-12:00 AM MST (from latest forecast run)
Main factor: Clear skies
Event details
New Moon September Dark Window
Sky background darkens; faint structures become easier.
When to look: Window: 2026-09-01 to 2026-09-03 (peak 2026-09-01). Use this dark window to prioritize faint targets and deep-sky attempts.
Where visible: US nationwide
How to watch: Start with naked-eye checks unless the event specifically benefits from optics.
What can ruin visibility
Check these before travel
Clouds, moonlight, haze, and light pollution can reduce visibility.
- Confirm timing
- Check clouds
- Check moonlight
- Choose a darker location
Event timing and verification
Authoritative date plus local-condition handoff
Calendar status: Sep 1-Sep 3 | Peak Sep 1
Calendar policy: Past event windows are removed from current and upcoming lists.
Forecast dataset: 2026-07-24
Use this event page for the sky-window baseline, then use the map or tonight forecast for clouds, moonlight, darkness, and the best local viewing window.
Best regions for this event
Use these as starting points, then validate locally
North Region Colorado forecast zone
State: Colorado
Score: 91 (Great)
Best window: Friday 12:00 AM-3:00 AM MDT
Main factor: Clear skies
North Region Vermont forecast zone
State: Vermont
Score: 91 (Great)
Best window: Friday 12:00 AM-3:00 AM EDT
Main factor: Clear skies
North Region Alaska forecast zone
State: Alaska
Score: 90 (Great)
Best window: Friday 8:00 PM-11:00 PM AKDT
Main factor: Clear skies
Confirm the event window
Simple field check
Use the event timing first, then recheck clouds, moonlight, and local access before leaving.
Use the event timing, then verify clouds, moonlight, and local darkness before travel.
Recheck local sky conditions before long travel, especially if the event depends on a short viewing window.