The weather in the high mountains can change suddenly. Always check the weather forecast before starting. Never hike to Trolltunga if there is a strong wind, heavy rain or fog. Remember that it is always colder up in the mountains than down by the fjord. Unfortunately, every year we have to rescue hikers who are poorly equipped or insufficiently prepared.
Your minimum required equipment includes: waterproof hiking boots, warm jumper, wind-/waterproof clothing, hat, gloves or mittens, extra set of clothing, sunglasses and sun protection, headlamp, plenty of food and water, first aid kit and an emergency bivouac shelter.