Please do not leave any signs of your visit and take only photographs amd memories with you. While summers are cool it can be hot on fine days in the valleys, but freezing temperatures can be expected at night. It can rain heavily for many days and you need warm woollen clothing and gloves in such weather. Gore Tex or other fully waterproof clothing is necessary. Best time to go is from May 15 to September 15 but at both ends of this time you can expect night frosts that are not uncommon in the fells even in the middle of summer.
Mosquitoes can be a great nuisance in some areas in Lapland.
You do not need to worry about mosquitoes while riding your bike. Main roads are good or excellent but can be winding and narrow in Norway where there are also numerous tunnels. There is excellent mountain bike cycling on dirt roads and mountain paths leading to the fells. Do not ride off road on the fells because you will damage the lichen that the reindeer use as food. Do not try to photograph the reindeer because you will scare the flock and it is hard work getting it together again.