Weather in Trondheim in June

Shoulder season. June sits in between. You will get good days and you will lose some. You should expect rain on 19 days of the month, which is more days wet than dry.

June ranks 3 of 12 in Trondheim. Only July scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 19 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 16.5 °C days and 8.8 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest June day reached 30.8 °C and the coldest night fell to 1.2 °C, and the wettest single day dropped 32 mm — roughly 24% of the month's rain in one day.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 200 mm against 55 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 134 mm average is a reasonable planning figure, not a promise.

Wind is light at 2.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How June sits in the year

The month is on the way up: 3.7 °C warmer than May, and July adds another 2.8 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in June

June is at or near the longest days of Trondheim's year: 20.5 hours of daylight, gaining 0.9 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 10.6 °C in June — too cold to swim without a wetsuit. The sea peaks at 14.2 °C in August and bottoms out at 6.1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in Trondheim versus nearby

If Trondheim is one option among several, the nearby comparison is worth making. Oslo is a better bet in June — 3 °C warmer, 5 days less rain. Bergen is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: June works, with July the better month by 9 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Trondheim

See all twelve months in Trondheim, or where else to go in June.