Hammocking in the (Scandinavian) fall

I'm pretty new in the hammocking game, but I really wanna enjoy the beautiful Danish fall this year from the coziness of my Hennessy.

Anywho, I don't own an underquilt (yet), what I do have is a winter sleeping bag (+ a liner) and a sleeping pad - both have kept me very warm in my tent in Lapland earlier this year.

Do you guys think that the bag and pad would be enough to keep me warm during the nights if I also sleep in my thermal underwear? I'm not entirely sure on the temperatures but lets say it gets down to about 5 degrees C?