Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Rjukan is from June, July, August. — some variation climate
🌦Cool & rainy
| Score | 9 | 10 | 13 | 21 | 45 | 76 | 73 | 77 | 53 | 12 | 8 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Polar | Polar | Cold | Cold | Cold | Cool & rainy | Cool & rainy | Cool & rainy | Cool & rainy | Cold | Cold | Polar |
| Temperature | -5–0°C | -4–1°C | -3–3°C | -1–6°C | 5–13°C | 11–20°C | 11–19°C | 11–19°C | 9–16°C | 4–9°C | 0–5°C | -4–0°C |
| Feels like | -10–-4°C | -9–-3°C | -7–-1°C | -5–3°C | 2–11°C | 9–19°C | 10–18°C | 10–18°C | 7–14°C | 1–7°C | -4–1°C | -8–-4°C |
| Precipitation | 92mm 17 days | 88mm 17 days | 68mm 14 days | 52mm 12 days | 70mm 14 days | 118mm 15 days | 136mm 20 days | 103mm 16 days | 123mm 16 days | 129mm 19 days | 114mm 20 days | 99mm 21 days |
| Sunshine | 2.3h ☀︎ 34% | 3.6h ☀︎ 39% | 5.9h ☀︎ 50% | 9.8h ☀︎ 67% | 10.3h ☀︎ 60% | 11.9h ☀︎ 64% | 10.1h ☀︎ 57% | 9.0h ☀︎ 58% | 6.6h ☀︎ 51% | 3.4h ☀︎ 34% | 1.7h ☀︎ 23% | 1.0h ☀︎ 17% |
| Wind | W · 20 km/h | W · 19 km/h | W · 17 km/h | NW · 16 km/h | W · 16 km/h | SW · 15 km/h | W · 16 km/h | SW · 15 km/h | SW · 16 km/h | SW · 18 km/h | W · 16 km/h | W · 16 km/h |
| Humidity (%) | 85% | 85% | 83% | 76% | 74% | 72% | 77% | 80% | 84% | 89% | 90% | 88% |
| Day length | 6.9h | 9.2h | 11.9h | 14.6h | 17.2h | 18.7h | 17.9h | 15.5h | 12.8h | 10.1h | 7.5h | 6.1h |
Rjukan's steep valley walls freeze into some of Europe's best ice climbing routes each winter, drawing climbers to this…
Rjukan fills to capacity in the sub-zero dark of winter when Europe's ice climbers arrive, but its true sweet spot is June—when endless daylight fills the deep gorge, mountain trails emerge, and the valley sits practically empty.
Tucked into the deep, narrow cleft of Vestfjorddalen, Rjukan is famous for living half the year in shadow. From late September until March, the sun never climbs high enough to crest the southern ridgeline, leaving the town floor bathed in cold twilight while giant hillside mirrors beam a patch of reflected light into the central square. Conventional wisdom treats this dramatic industrial valley as a winter redoubt, packed with extreme alpinists, or as an August detour. But while August technically matches its warmth, June is the revelation: the birch forests explode into vibrant green, the sun stays high for nearly twenty hours a day, and you have the waterfalls and mountain ridges almost completely to yourself.
June delivers the greatest mismatch between quality and foot traffic anywhere in Telemark. While high summer crowds do not arrive until late July and August, June receives virtually identical mild temperatures, with afternoon warmth that feels genuinely comfortable for all-day hiking. The sun hangs suspended over the valley rim, showering daylight into a gorge that spent five months in total shade.
Water from the melting snowfields of the high plateau thunders down toward the lake of Tinnsjå, and the gorge around the historic Vemork power station roars with life. Trails up toward the rocky summit of Gaustatoppen become passable as the lingering snow crust thins under the bright sky. You can spend an entire afternoon wandering the industrial architecture and forest paths without queuing behind a single tour bus or negotiating a crowded overlook.
By August, standard travel guides finally point their readers toward Rjukan. The weather is marginally more settled, with comfortable afternoon air and slightly lower rain volume than midsummer storms bring in July. It is undeniably pleasant, but you pay for that slight stability with company. Hikers stack up along the popular trails, viewpoints fill with camper vans, and the sense of isolated wilderness in the shadows of Gaustatoppen softens into a busy mountain holiday.
July sits between the two moods: lush, warm, and punctuated by sudden downpours that echo loudly through the valley walls. The lake at Møsvatn glistens under long afternoon sunbreaks, offering swimming for the cold-tolerant, but the atmosphere lacks the quiet wonder of early summer.
Autumn in the valley begins with a fiery burst of yellow birch leaves, but the calendar turns sharply cold by October. As the earth tilts, the high southern wall of Vestfjorddalen begins blocking the low sun, casting the town of Rjukan into its notorious semi-annual blackout. By mid-autumn, the direct rays fail to strike the town floor entirely.
October brings damp, chilling drizzle and raw air that seeps into your clothing within minutes. The mountain trails turn slick with mud and early verglas, and the silence that settles over the gorge feels heavy rather than peaceful. Unless you are captivated by moody photography and industrial history wrapped in mist, this is the most inhospitable stretch of the year.
In sheer visitor numbers, midwinter is Rjukan's busiest era. The sheer granite walls flanking the town turn into hundreds of massive frozen cascades, transforming the valley into an internationally renowned arena for vertical ice climbing. February marks the absolute peak of the frenzy, anchored by the Rjukan Ice Festival, when climbers from across the continent crowd into town for clinics and ascents in sub-zero cold.
For anyone not wearing crampons, however, this period demands serious endurance. The town floor remains perpetually sunless, the air registers a biting freeze, and daylight shrinks to a handful of twilight hours. The hillside mirrors catch what little high sun exists and shine a theatrical beam onto the frozen town square, but it offers spectacle rather than warmth. Come to marvel at the ice climbers scaling turquoise pillars beneath Vemork, but pack for relentless, bone-deep cold.
March brings the ceremonial return of natural direct sunlight to the valley bottom, a moment celebrated locally after months of gloom. The high country remains locked in hard snow, offering fine cross-country skiing, but the valley itself enters a prolonged, muddy transition.
By May, the snowline retreats up the slopes toward Gaustatoppen, and the Rjukan Falls roar with the immense runoff spilling from the melting plateau. The daylight returns with astonishing speed, jumping to ten hours of bright sunshine a day. The days feel brisk rather than warm, making it a transitional season best enjoyed on foot along the lower valley trails before the summer foliage fully unfurls.