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NorwayThe weather in September in Trondheim
It's cool to moderate in September in Trondheim with an average temperature of 15°C. Temperatures this month range from a low of 13°C to a high of 17°C. At night, you can expect temperatures between 7°C and 11°C.
Looking for sun and warm weather? September isn’t a good month to be in Trondheim. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Trondheim, Norway. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 24°C in 2023, Trondheim reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 6°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 1°C to a highest value of 15°C.
Water temperature
The water temperature at Trondheim is 16°C this month. This is probably too cold to swim without protective gear.
Rainfall amount
In September, there is an average of 80 mm of precipitation, spread over 11 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Trondheim
Click on any day in September to get detailed info about the usual weather on that day in Trondheim. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Trondheim | New York | |
|---|---|---|
| Average temperature | 15°C | 27°C |
| Max. temperature | 17°C | 31°C |
| Min. temperature | 7°C | -5°C |
| Total precipitation | 80 mm | 57 mm |
| Rainy days | 11 days | 9 days |
Start of September
The month of September starts in Trondheim with cool temps, averaging around 17°C during the day and nights around 10°C.
Mid September
By mid-September, daytime temps drop to around 15°C, with nights around 9°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Trondheim is around 15°C, while nighttime temps are about 9°C. A shower might pop up, but overall, the weather will be dry and sunny.
Find affordable trips to Trondheim
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Trondheim for all months and discover the best travel time
Curious about the weather in other parts of Norway? Check out the climate and weather for spots like Oslo, Lofoten, Vesterålen, or explore other destinations in Norway.
Temperature charts
These charts show the average temperatures in September in Trondheim, Norway. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Trondheim
Temperature in September in Trondheim over the years
Precipitation charts
These charts show the average amount of precipitation in September in Trondheim, Norway. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Trondheim
Total precipitation in September in Trondheim over the years
Daily UV index in September in Trondheim
This chart shows the average daily UV index in September in Trondheim, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Trondheim
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Average weather in Trondheim by month
Click on a month below to see detailed weather info for Trondheim. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.