If the temps aren't dropping too low it should be fine. You probably won't be able to get the 90 basking spot with no UTH but that will be fine of its only for the couple weeks. It would be probably best if they stay above 80. If you need to, even adding a 60 or 100 watt incandescent bulb during the day could help with heat. If the temps stay lower you should probably not feed during that time either. Wouldn't want it to try and digest without the proper heat.