Is it worth going
outside tonight?
One honest answer for your city, every night, anywhere on Earth. Aurora, rocket launches, meteor showers and the space station, weighed against the Moon and the cloud forecast, as a single score out of 100.
6,468 cities in 171 countries · browse by country · updated around the clock · free
Where it's worth looking up
Top-scoring cities worldwide from the latest run (3 min ago). It's always night somewhere, so this list follows the dark around the planet.
Aurora possibleGo outside87Saskatoon, Saskatchewan
Aurora possibleGo outside71Regina, Saskatchewan
Aurora possibleWorth a look65Edmonton, Alberta
Aurora possibleWorth a look64St. Albert, Alberta
Aurora possibleWorth a look62Sherwood Park, Alberta
Aurora possibleWorth a look59Calgary, Alberta
Aurora possibleWorth a look59Medicine Hat, Alberta
Aurora possibleWorth a look
One number, honestly made
Get a heads-up when it's worth going out
One email when your sky is genuinely worth it: an aurora within reach, a launch you can see, a clear peak night. Nothing on ordinary nights. We'll confirm your address first, and you can unsubscribe in one click.
Good to know
Can I really see the aurora from my city?
Sometimes. During strong geomagnetic storms the aurora reaches far beyond the polar regions, usually as a glow low on the horizon facing the pole (north in the Northern Hemisphere, south in the Southern) that cameras pick up better than eyes. Each city page shows the storm strength (Kp) it typically takes to see it from there.
Why does a clear night with nothing happening still score above zero?
Because a dark, clear sky always has something: the Moon, planets, the Milky Way away from city lights. That baseline is small on purpose. The score climbs only when there's an event worth stepping out for.
How accurate is it?
Space station passes are computed from official orbital data and checked against NASA's published trajectory. Aurora and cloud forecasts are forecasts: good, not perfect. We show our working so you can judge for yourself.