NorwayAverage weather for Trondheim in September
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.
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. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
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.
Water temperature
The water temperature at Trondheim is 16°C this month. This is probably too cold to swim without protective gear.
In September, there is an average of 80 mm of precipitation, spread over 13 days. The wind speed is around 4 Bft, mostly coming from the South.
Trondheim in September |
New York | ||
|---|---|---|---|
 Average temperature |
15°C | 27°C | |
 Max. temperature |
17°C | 31°C | |
| Min. temperature |
13°C | -5°C | |
 Total precipitation |
80 mm | 57 mm | |
| Rainy days |
13 days | 9 days | |
August
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.
Is September a good time to visit Trondheim?
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.
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.
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.
Daily Temperature in September in Trondheim
This chart shows the average daily high and low temperatures in September for Trondheim, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Trondheim
The chart below shows the average daily precipitation in September for Trondheim, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 13 days of precipitation in Trondheim.
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.
Temperature in September in Trondheim over the years
This chart shows the average temperature in September in Trondheim, measured in degrees Celsius, over the past few years.
Total precipitation in September in Trondheim over the years
This chart shows the average precipitation in September in Trondheim, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in September in Trondheim
Have you been to Trondheim in September?
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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.
Or check out the climate of Trondheim for all months at once
