Trondheim Weather Overview:
It depends where you are in the Trondheim area as to the weather you’ll get. On the shoreline the sea moderates the temperature, cooling the air in summer and raising the temperature by an average of up to 3C in winter. Not far from the Arctic Circle, you wouldn’t expect it to be a beach destination but you’ll still get many warm sunny days in the summer. Winters can be very cold with more than a month spent below zero.
All Time Highs and Lows:
Trondheim’s highest recorded temperature was in 1901 when on the 22nd July, the city sweltered at 95f. Only two years before, in February 1899, they shivered as the temperature dropped to -16.1.
Right on the shore of where the North Sea meets the Arctic Ocean, Trondheim has a hemiboreal oceanic climate according to Koppen but it’s is strongly influenced by the continental and arctic climate of the land behind the coast. The effect is mainly seen in the difference between the temperatures at the water’s edge and just a couple of miles inland.
Spring: Spring starts with a bang as temperatures rise significantly in March with the lengthening of days. From regularly below freezing in February, March often sees temperatures just below 10C. The sunshine levels increase dramatically too, giving the whole city a feeling of waking up as the number of hours on average doubles over the month.
Summer: It rarely gets hot in Trondheim but you’ll still average a month of temperatures over 70f each summer. Daylight seems never ending and at the solstice the sun disappears for only a matter of hours before returning. Rainfall is at its highest in the summer months, brought on by the rising temperatures and humidity off the sea.
Autumn: Autumn comes quickly to the city and by October you’ll be feeling chilly out by day and need to wrap up in the evenings. The first snowfall can be expected inland and in the higher parts of the city. The evenings are encroaching more into the afternoons as sunshine hours drop to only a couple each day
Winter: Winters can be dark, cold and miserable in Trondheim and with temperatures averaging five below freezing through the season and with potentially nearly a month through January and February where you’ll suffer at below -10C, you’ll need to wrap up well. For a good few weeks over a foot of snow will lay on the ground and most winter days can expect at least a flurry or two.
Best Time to Visit:
Summer is by far the best time to visit Trondheim. It won’t be hot and shorts may be a brave choice but for walking around the city and exploring inland, the temperature is ideal. The best part of summer is the daylight hours and many of the city’s residents spend as much time outdoors as possible making the most of the ‘midnight sun’.