May weather forecast
Trondheim, Norway

May is when Trondheim truly blossoms into spring. The once-frozen city starts to warm up with temperatures ranging from 4°C (39.2°F) to 12°C (53.6°F). The snow slowly retreats, replaced by blooming flowers and lush greenery. As the city is still not in the full grasp of summer, it experiences lesser rainfall than in the following months, making May a perfect month to explore the city’s scenic beauty. Towards the end of May, the daylight hours start to approach an impressive 20-hour mark, signifying the impending arrival of the much-anticipated summer season.

Temperature

May's onset brings a rise in the average high-temperature, moving from a chilly 6°C (42.8°F) in April to a fresh 12°C (53.6°F). May sees the temperature falling to a mean low of 4°C (39.2°F).

Rainfall

The month with the least rainfall in Trondheim, Norway, is May, when the rain falls for 15 days and typically collects 53mm (2.09") of precipitation.

Sea temperature

In Trondheim, in May, the average water temperature is 9°C (48.2°F).
Note: It is risky to swim in 9°C (48.2°F). Temperatures beneath 10°C (50°F) induce rapid cold shock and hyperventilation.

Daylight

In May, the average length of the day is 18h and 13min.
On the first day of the month, sunrise is at 04:53 and sunset at 21:37. On the last day of May, sunrise is at 03:25 and sunset at 23:06 CEST.

Sunshine

May and June, with an average of 7h of sunshine, are months with the most sunshine in Trondheim, Norway.

UV index

The average daily maximum UV index in May is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: An average UV index of 3 in May transforms into this advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.