Yes it chilly but it also turns out to be one of my favorite time of the year. The landscape is still wearing its autumn colors and it is not raining as much. The air is crisp and vivifying. This is the best time to go out for a walk, take pictures and come back home to enjoy a hot drink.
Below is a picture taken last Saturday going up Botnssúlur. The picture shows Hvalfell (~850m/2789ft) on the left and Botnssúlur (~1080m/3543ft) on the right with already a thin layer of snow.
Weather outside: Sunny, 2°C