Is it worth going
outside tonight?
One honest answer for your city, every night. Northern lights, rocket launches, meteor showers and the space station, weighed against the Moon and the cloud forecast, as a single score out of 100.
1,001 cities across the United States and Canada · updated through the night · free
Where it's worth looking up
Top-scoring cities from the latest run (17 min ago). Scores refresh through the night as the forecasts change.
Aurora possibleGo outside90Winnipeg, Manitoba
Aurora possibleGo outside88Saskatoon, Saskatchewan
Aurora possibleGo outside86Grand Forks, North Dakota
Aurora possibleGo outside85Medicine Hat, Alberta
Aurora possibleGo outside78Duluth, Minnesota
Aurora possibleGo outside76Fargo, North Dakota
Aurora possibleGo outside76Sault Ste. Marie, Ontario
Aurora possibleGo outside
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 northern lights from my city?
Sometimes. During strong geomagnetic storms the aurora reaches far south of where it normally appears, usually as a glow low on the northern horizon 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.