Know before you go

Observing conditions

Understand how clouds, moonlight, darkness, weather, and city glow will affect what you can see.

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Tonight at a glanceWaiting for the complete forecastWe are combining darkness, clouds, Moon, visibility, dew, wind, and city glow.

What builds the overall score

Reading tonight's forecast

Checking the Moon

Deep-sky observing is severely limited.

Your observing point

LIVE

Tonight's forecast

Weather & cloud cover

Reading the forecast

Comparing clouds with tonight's darkness window…

Continue planning

See hourly cloud cover, visibility, humidity, wind and precipitation chance.

Find astronomical night, twilight phases and the Moon's effect.

Understand your Bortle class and look for darker nearby places.