If you want to see Northern lights even in Tampere, this is a good time to look at the sky when it's not cloudy. The most active time is around midnight.
Tampere is located too south to see the lights often, but when there is a big magnetical storm, southern Finland can be even better place to see the lights than north. Read more from our INTOpedia.
"Aurora is a visual phenomena resulting from solar wind particles colliding with Earth's atmosphere. Auroral displays are visually awesome to witness and all the more active events appear to be always different, than the ones seen before due to vast combination of forms and colours and their combinations."..