The 10-day span for Trondheim runs from a high near 68° on Friday down to 50° overnight on Wednesday. Roughly 1.4 in of rain falls over the period, with Tuesday the most likely wet day (90%). Hold onto the patio furniture Friday: gusts could hit 32 mph. Right now Trondheim is running about 8° warmer than Oslo. Longer view: a high-latitude climate — short, luminous summers and long, dark winters.
Trondheim, Norway · 63.43°N, 10.40°E · Europe/Oslo · Forecast computed for these exact coordinates