Is it okay i take a fleece sleeping bag when going camping at this time?

It's okay to take a fleece bag. If you are concerned about being hot, just take a thinner sheet to use. You can sleep in the bag or on top. I've done both. If you happen to be in a colder area, take extra blankets to use inside your bag. If sleeping outside, you might like to take a tarp or something to spread on the ground so stuff doesn't get stuck to your bag as much, or get damp from the ground. Thick sleeping bags can be a pain to wash ( use the laundry mats big washing machines) Also, if you do sleep outside, consider bug spray and/ or a mosquito net.