Tromsø faces a damp few days. Drizzle today and tomorrow, then around 10 mm of rain on Friday. The wind is already blowing at 37 km/h this morning, and highs stay near 10 °C. Friday's low is 2 °C. Wet plus wind chills you faster than cold alone. Take a fully waterproof shell with taped seams rather than a water-resistant softshell, and keep a dry layer packed.
Waterproof jackets ↗