Trondheim weather
Our guide to the weather in Trondheim during September
Trondheim is a vibrant city in Norway, offering a wealth of cultural attractions and activities all year round, particularly in September when the days are still long and the temperatures mild. We've looked at the most up-to-date weather data for Trondheim, covering the last 12 years up to 2026, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Trondheim weather in September.
What's the temperature like in Trondheim during September?
The temperature reaches around 14℃ during the daytime in September, falling away to 7℃ at night. The UV index will be low at this time of year, so not something to worry about. However, if you're going to be outside for long periods it's always a good idea to apply a small amount of sunscreen to exposed skin.
Does it rain in Trondheim during September?
On average, there will be 8 rainy days during the month, amounting to 114.4mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Trondheim during September?
You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate air temperatures, any breeze will feel cool.
Weather in Trondheim
Our month-by-month guide to the weather and climate in Trondheim
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