Finland’s capital is far south of the auroral oval. The northern lights are seen here only during strong geomagnetic storms, low on the northern horizon.
At 60.2° N, Helsinki needs a fairly strong geomagnetic storm – usually Kp 6 or more when the sky is dark and clear. Clouds are the biggest obstacle, so always check the cloud forecast above before heading out.
In late December Helsinki has about 15 hours of darkness every night, around the autumn equinox about 9 hours and around the spring equinox about 9 hours; in mid-April still about 7 hours. See when to see the northern lights for a month-by-month guide.