Trondheim Weather in September

September in Trondheim averages 16°C (61°F) during the day and 7°C (45°F) at night. It is the wettest month of the year, with 120 mm (4.7 in) of rainfall on average, so waterproof gear is a must.

Rainfall in Trondheim in September

Given that this is the rainiest month, it's wise to carry an umbrella to stay dry during unexpected showers. Looking at the last 30 years, the data shows about 24 days with rain, averaging 120 mm (4.7 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Trondheim in September

If you're visiting Trondheim in September, expect highs of 16°C (61°F) and overnight lows around 7°C (45°F). Conditions are often most pleasant around the middle of the day. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Trondheim in September

The area enjoys a moderate level of sunlight, with around 132 hours. It's a good balance between sunny and cloudy days.

If your ideal day consists of dry skies and pleasant temperatures, July typically offers the best circumstances for Trondheim.