The week of 8 September 2025 - 14 September 2025 had an average daily temperature of 20 °C (68 °F) and a minimum (nighttime) temperature of 12 °C (54 °F). The current temperatures are above the long-term average for Trondheim, with the daily and nighttime temperatures being 14 °C (57 °F) and 7 °C (45 °F), respectively. The hottest day of the week was Monday in the beginning of the week. The average temperatures observed during different times of day (based on local time) were as below: 7am 13 °C (55 °F), 10am 17 °C (63 °F), 1pm 19 °C (66 °F), 4pm 20 °C (68 °F), 7pm 17 °C (63 °F), 10pm 14 °C (57 °F).

During this week: 5 days without rain, 1 day with light rain and 1 day with moderate rain were observed. The total precipitation for the week in Trondheim was 15 mm (0.59 in), which is slightly below the area's average of 23 mm (0.91 in). The daytime hours (from dawn to dusk) had an average cloud coverage of 57 %.

Average speed of wind was 1.8 m/s. South-East was the dominant wind direction(s). The air pressure was 993 hpa - 1020 hpa. The air in Trondheim had an average humidity of 70 %.

During the daytime (from dawn to dusk), there were in average: 3 hours clear skies, 6.5 hours partially overcast skies, 4 hours overcast skies and 1 hour rainy weather. Average time of sunrise was 06:31, average time of sunset was 19:58.

Weather overview

Trondheim (Norway) in general has a mild climate. Temperatures during the day are in the range from 2 °C (35 °F) in January to 19 °C (66 °F) in July. The driest month is May with just 11 days of rain, on the contrary, the month when it rains the most is September with 16 days of rain. The highest night temperatures could be experienced in July with 11 °C (51 °F), the lowest in February with -4 °C (25 °F).

January weather

The minimum of the day temperature can be noticed, with its value of 2 °C (35 °F) in Trondheim. The rainfall amount descent's start could be observed, its value is 82 mm (3.24 in). The maximum of the wind speed can be noticed, with its value being 5.

February weather

The number of rainy days descent's start could be observed, its value is 14 days in Trondheim, while the rainfall amount continues to descent, with its value being 72 mm (2.84 in). The minimum of the night temperature can be noticed in February. The beginning of the rise of the number of sun hours (without clouds) could be noticed, the value of this measure is 1 hour.

March weather

The beginning of the rise of the day temperature could be noticed in Trondheim, and the night temperature rise's start could be observed as well, its value is -2 °C (28 °F). The descent of the number of rainy days can be observed, the value of this measure is 13 days, and the rainfall amount descents similarly to the previous month too, the value of this measure is 64 mm (2.52 in). The number of sun hours (without clouds) continues to rise, with its value being 3 hours.

April weather

The day temperature rises similarly to the previous month, the value of this measure is 9 °C (47 °F) in Trondheim, and the rise of the night temperature can be observed too, the value of this measure is 1 °C (33 °F). The descent of the number of rainy days can be observed, with its value being 12 days, while the rainfall amount is on its minimum, the value of this measure is 53 mm (2.08 in). The number of sun hours (without clouds) rises similarly to the previous month.

May weather

The rise of the day temperature can be observed, its value is 14 °C (56 °F) in Trondheim, and the night temperature rises similarly to the previous month too, the value of this measure is 5 °C (40 °F). The number of rainy days reaches its minimum in this month. The rise of the number of sun hours (without clouds) can be observed, its value is 7 hours. The minimum of the humidity is observable, with its value being 72 %.

June weather

The day temperature continues to rise, its value is 17 °C (62 °F) in Trondheim, and the rise of the night temperature can be observed as well, its value is 8 °C (47 °F). The number of rainy days starts to rise, with its value of 14 days. The number of sun hours (without clouds) reaches its maximum. The day length reaches its maximum in this month.

July weather

The tourist season is about to start in Trondheim. The maximum of the day temperature can be noticed, the value of this measure is 19 °C (66 °F), and the night temperature is on its maximum as well in this month. The rainfall amount rises similarly to the previous month, with its value of 83 mm (3.26 in). The number of sun hours (without clouds) starts to descent, the value of this measure is 6 hours.

August weather

The day temperature descent's start could be observed, its value is 18 °C (64 °F) in Trondheim, and the night temperature starts to descent as well, its value is 10 °C (50 °F). The tourist season is close to its peak this month. The rainfall amount continues to rise, with its value of 92 mm (3.62 in). The wind speed reaches its minimum in this month.

September weather

The descent of the day temperature can be observed, its value is 14 °C (57 °F) in Trondheim, and the night temperature continues to descent as well, with its value of 7 °C (44 °F). The number of rainy days is on its maximum, with its value of 16 days, and the maximum of the rainfall amount can be noticed as well in September. The number of sun hours (without clouds) continues to descent, with its value of 3 hours.

October weather

The day temperature continues to descent, with its value being 9 °C (47 °F) in Trondheim, and the night temperature continues to descent as well, with its value being 3 °C (38 °F). The number of rainy days starts to descent, with its value being 15 days, and the rainfall amount descent's start could be observed as well in this month. The number of sun hours (without clouds) continues to descent, the value of this measure is 2 hours.

November weather

The day temperature continues to descent, the value of this measure is 4 °C (39 °F) in Trondheim, and the night temperature descents similarly to the previous month too, the value of this measure is 0 °C (31 °F). The number of rainy days continues to descent, with its value of 14 days, and the descent of the rainfall amount can be observed too, its value is 76 mm (3.00 in). The number of sun hours (without clouds) continues to descent, the value of this measure is 1 hour.

December weather

The day temperature continues to descent, the value of this measure is 2 °C (35 °F) in Trondheim. The beginning of the rise of the number of rainy days could be noticed, with its value being 15 days, and the beginning of the rise of the rainfall amount could be noticed too. The humidity is on its maximum in this month. The number of sun hours (without clouds) reaches its minimum in this month.

What is the night temperature in Trondheim in May?

The average night temperature in Trondheim in May is 5 °C (40 °F). The nights will be cool, layers of clothes will be needed for evening and morning walks, the hotel should be equipped with heating.

What is the temperature in Trondheim during the day in June?

The average daily temperature in Trondheim in June is 17 °C (62 °F). Nice temperature for walking around the city or on the beach, but you will probably get cold soon when wearing a swimsuit. When walking around all day, people used to cold conditions, pull out their shorts and get rid of their sweaters. On some days, when spending time in the direct sun, sunscreen can be useful, especially for people with more sensitive skin.

Is July a good month to visit Trondheim?

In July in Trondheim, there are ideal conditions for a vacation. There are some people, who may feel a slight chill at 19 °C (66 °F), but others will feel perfectly fine. The temperature of 11 °C (51 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.

Is August part of the wet season in Trondheim?

No, there is no wet season in Trondheim in August - you can expect 16 days of rain during the month.

How many days of precipitation on average can I expect in September in Trondheim?

There are 16 days, which are rainy in September in Trondheim, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 3.7 days of the week, or in general - 52 % days.