Trondheim weather in August
August in Trondheim: nice, rainy, with clean air — an excellent time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#3 of 12 months in Trondheim · #522 of 1413 destinations to visit in August · comfort 84/100 (tier A)
- Days
- 19°C
- Nights
- 11°C
- Wet days
- 14
- Sun
- 9.5 h
- Humidity
- 82%
- Daylight
- 16 h

Traveller notes on Trondheim in August
Notes from nearby Åre (134 km away)
Trondheim doesn't have its own notes for August yet — these are about Åre, close enough to share the season.
Are-forum threads on Swedish mountain hiking describe the resort's own lifts as running through summer to serve hikers and bikers, posters calling this a genuinely easy way to reach higher trails without a full climb. Regulars call the wider region a real draw for hiking, fishing and biking this time of year, activities considerably different from the resort's winter identity. Posters recommend riding a lift up and choosing a walking route back down, a real option for anyone wanting views without the full ascent. Regulars call the surrounding mountains rewarding for August specifically, cooler temperatures and real daylight both still generous. Posters recommend real layers regardless of how the valley floor feels, mountain weather here shifting considerably faster than the lowlands. Regulars call August a solid window for anyone chasing outdoor activity over winter crowds. The record: 16.7C days feeling like 16C, 9C nights, 81.1mm across over 14 days and 81 percent humidity.
Other months in Trondheim
Forum posters describe December in Trondheim as bringing short, cold days with ground typically covered in snow, noting that locals lean toward cross-country skiing rather than walking this time of year. Posters are direct that heavy snow arriving right before or during a visit can rule out most walking plans entirely, though the tram ride up to Lian is consistently flagged as a safe, reliable option regardless of conditions. Posters consistently recommend wool long underwear along with a hat and gloves as genuine essentials, noting that special outerwear pants aren't really needed for strolling around the city itself. Posters flag that many students leave for the holidays, leaving Trondheim noticeably quieter than usual through late December. Posters generally rate December as workable but genuinely weather-dependent, with flexibility the key to enjoying a winter visit.
June in Trondheim barely gets dark — over twenty hours of daylight — and the forum's own saying is that if you are not happy with the weather, give it five minutes. Expect 10 to 20°C, some nights down to 5, occasional days above 25, and the honest possibility of cold, windy and rainy instead. They call June relatively dry, though the record still shows rain on about thirteen days. The packing list is a list precisely because you may need all of it: windproof and waterproof shell, a woollen sweater, long trousers, hiking shoes, and shorts. June versus July is not worth agonising over — the difference is statistical.
Add your own note from Trondheim's card on the map.
Trondheim climate normals — August
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Trondheim in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsOlavsfest, Summer holidays in Norway, school holidays in 7 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Trondheim's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherTrondheim's weather peaks June–August, best around July.
August includes Olavsfest.
Best weatherFair weatherToughest weather
What's on in Trondheim in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Pilgrim walking season
1 Jun – 15 Sep · usuallyTrail seasonThe St Olav Ways into Nidaros are walkable once the snow is off the Dovre passes, and the hostels along them open for the season. Walkers arrive at the cathedral all summer, thickest in the week before Olsok. Source ↗
- Festival
Olavsfest
26 Jul – 4 Aug · usuallyMusic festivalCrowdedA week around Olsok on 29 July, the anniversary of the battle where Olav was killed, with concerts in and around Nidaros and a medieval market in the cathedral grounds. Source ↗
Nearby, and something's on
Within 300 km of Trondheim — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Trondheim?
Trondheim in August — FAQ
- Is August a good time to visit Trondheim?
- August in Trondheim: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Trondheim on SeasonMap's comfort score (84/100).
- What is the weather like in Trondheim in August?
- In August, Trondheim averages a daily high of 19.2°C and a low of 10.9°C, with about 103.7 mm of rain over roughly 13.7 rainy days.
- What is the air quality in Trondheim in August?
- Trondheim has a mean US Air Quality Index of about 27 in August.
Within 300 km: Geiranger's Dalsnibba and Eagle Road open around 20 May – 5 Nov, and Ålesund's Norwegian Food Festival around 20–31 Aug.